CN114203985A - Lithium ion battery with wide temperature range and preparation method thereof - Google Patents
Lithium ion battery with wide temperature range and preparation method thereof Download PDFInfo
- Publication number
- CN114203985A CN114203985A CN202111314159.7A CN202111314159A CN114203985A CN 114203985 A CN114203985 A CN 114203985A CN 202111314159 A CN202111314159 A CN 202111314159A CN 114203985 A CN114203985 A CN 114203985A
- Authority
- CN
- China
- Prior art keywords
- lithium ion
- ion battery
- parts
- lithium
- temperature range
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 80
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 80
- 238000002360 preparation method Methods 0.000 title claims abstract description 20
- 229910021383 artificial graphite Inorganic materials 0.000 claims abstract description 43
- 239000000463 material Substances 0.000 claims abstract description 35
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 28
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 28
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 claims abstract description 28
- 239000003792 electrolyte Substances 0.000 claims abstract description 23
- 238000004806 packaging method and process Methods 0.000 claims abstract description 9
- 239000002002 slurry Substances 0.000 claims abstract description 8
- 238000003825 pressing Methods 0.000 claims abstract description 7
- 238000009517 secondary packaging Methods 0.000 claims abstract description 7
- 239000002994 raw material Substances 0.000 claims abstract description 5
- 238000002156 mixing Methods 0.000 claims description 33
- 230000004913 activation Effects 0.000 claims description 28
- 239000011163 secondary particle Substances 0.000 claims description 28
- 238000001994 activation Methods 0.000 claims description 26
- 239000007787 solid Substances 0.000 claims description 26
- 239000011267 electrode slurry Substances 0.000 claims description 23
- -1 lithium hexafluorophosphate Chemical compound 0.000 claims description 19
- 230000015572 biosynthetic process Effects 0.000 claims description 18
- 239000000919 ceramic Substances 0.000 claims description 16
- 239000011248 coating agent Substances 0.000 claims description 15
- 238000000576 coating method Methods 0.000 claims description 15
- 239000011230 binding agent Substances 0.000 claims description 14
- 239000002245 particle Substances 0.000 claims description 13
- FSSPGSAQUIYDCN-UHFFFAOYSA-N 1,3-Propane sultone Chemical compound O=S1(=O)CCCO1 FSSPGSAQUIYDCN-UHFFFAOYSA-N 0.000 claims description 12
- VAYTZRYEBVHVLE-UHFFFAOYSA-N 1,3-dioxol-2-one Chemical compound O=C1OC=CO1 VAYTZRYEBVHVLE-UHFFFAOYSA-N 0.000 claims description 12
- 239000006258 conductive agent Substances 0.000 claims description 12
- QSZMZKBZAYQGRS-UHFFFAOYSA-N lithium;bis(trifluoromethylsulfonyl)azanide Chemical compound [Li+].FC(F)(F)S(=O)(=O)[N-]S(=O)(=O)C(F)(F)F QSZMZKBZAYQGRS-UHFFFAOYSA-N 0.000 claims description 12
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 claims description 11
- 239000000654 additive Substances 0.000 claims description 11
- VEWLDLAARDMXSB-UHFFFAOYSA-N ethenyl sulfate;hydron Chemical compound OS(=O)(=O)OC=C VEWLDLAARDMXSB-UHFFFAOYSA-N 0.000 claims description 11
- JBTWLSYIZRCDFO-UHFFFAOYSA-N ethyl methyl carbonate Chemical compound CCOC(=O)OC JBTWLSYIZRCDFO-UHFFFAOYSA-N 0.000 claims description 11
- 229910003002 lithium salt Inorganic materials 0.000 claims description 11
- 159000000002 lithium salts Chemical class 0.000 claims description 11
- RUOJZAUFBMNUDX-UHFFFAOYSA-N propylene carbonate Chemical compound CC1COC(=O)O1 RUOJZAUFBMNUDX-UHFFFAOYSA-N 0.000 claims description 11
- 239000003960 organic solvent Substances 0.000 claims description 10
- 238000007789 sealing Methods 0.000 claims description 10
- 230000000996 additive effect Effects 0.000 claims description 7
- 238000002347 injection Methods 0.000 claims description 7
- 239000007924 injection Substances 0.000 claims description 7
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims description 6
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 6
- 238000005755 formation reaction Methods 0.000 claims description 6
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 6
- YKYONYBAUNKHLG-UHFFFAOYSA-N n-Propyl acetate Natural products CCCOC(C)=O YKYONYBAUNKHLG-UHFFFAOYSA-N 0.000 claims description 6
- 229940090181 propyl acetate Drugs 0.000 claims description 6
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims description 6
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims description 6
- NQPDZGIKBAWPEJ-UHFFFAOYSA-N valeric acid Chemical compound CCCCC(O)=O NQPDZGIKBAWPEJ-UHFFFAOYSA-N 0.000 claims description 6
- 229920003023 plastic Polymers 0.000 claims description 5
- 239000004033 plastic Substances 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 4
- 150000001408 amides Chemical class 0.000 claims description 3
- 239000002798 polar solvent Substances 0.000 claims description 3
- 239000002904 solvent Substances 0.000 claims description 3
- 239000002131 composite material Substances 0.000 claims description 2
- 238000005259 measurement Methods 0.000 claims description 2
- 238000003475 lamination Methods 0.000 abstract description 6
- 230000035939 shock Effects 0.000 abstract description 6
- 230000003213 activating effect Effects 0.000 abstract description 3
- 238000003756 stirring Methods 0.000 description 30
- 230000000052 comparative effect Effects 0.000 description 21
- 239000004698 Polyethylene Substances 0.000 description 13
- 229920000573 polyethylene Polymers 0.000 description 13
- 239000002033 PVDF binder Substances 0.000 description 11
- 239000010410 layer Substances 0.000 description 11
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical group CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 9
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 9
- 229910052782 aluminium Inorganic materials 0.000 description 9
- 239000000843 powder Substances 0.000 description 8
- 239000011265 semifinished product Substances 0.000 description 8
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 7
- 229920003048 styrene butadiene rubber Polymers 0.000 description 7
- 239000002174 Styrene-butadiene Substances 0.000 description 6
- 239000007788 liquid Substances 0.000 description 6
- 229910003473 lithium bis(trifluoromethanesulfonyl)imide Inorganic materials 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 238000003860 storage Methods 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 5
- 229910013872 LiPF Inorganic materials 0.000 description 5
- 101150058243 Lipf gene Proteins 0.000 description 5
- 239000011889 copper foil Substances 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 5
- 239000011888 foil Substances 0.000 description 5
- 239000003292 glue Substances 0.000 description 5
- 238000011068 loading method Methods 0.000 description 5
- 239000002985 plastic film Substances 0.000 description 5
- 229920006255 plastic film Polymers 0.000 description 5
- 238000011084 recovery Methods 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 4
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 4
- 238000005520 cutting process Methods 0.000 description 4
- 238000010030 laminating Methods 0.000 description 4
- 239000011224 oxide ceramic Substances 0.000 description 4
- 229910052574 oxide ceramic Inorganic materials 0.000 description 4
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- 239000006257 cathode slurry Substances 0.000 description 2
- 229920000126 latex Polymers 0.000 description 2
- 239000004816 latex Substances 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical group C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 230000003446 memory effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012785 packaging film Substances 0.000 description 1
- 229920006280 packaging film Polymers 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000011115 styrene butadiene Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/362—Composites
- H01M4/364—Composites as mixtures
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
- H01M10/0566—Liquid materials
- H01M10/0567—Liquid materials characterised by the additives
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4235—Safety or regulating additives or arrangements in electrodes, separators or electrolyte
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/52—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron
- H01M4/525—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
- H01M4/5825—Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
- H01M4/583—Carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M4/587—Carbonaceous material, e.g. graphite-intercalation compounds or CFx for inserting or intercalating light metals
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/411—Organic material
- H01M50/414—Synthetic resins, e.g. thermoplastics or thermosetting resins
- H01M50/417—Polyolefins
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/431—Inorganic material
- H01M50/434—Ceramics
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/449—Separators, membranes or diaphragms characterised by the material having a layered structure
- H01M50/451—Separators, membranes or diaphragms characterised by the material having a layered structure comprising layers of only organic material and layers containing inorganic material
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Landscapes
- Chemical & Material Sciences (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Composite Materials (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Ceramic Engineering (AREA)
- Crystallography & Structural Chemistry (AREA)
- Secondary Cells (AREA)
Abstract
The invention provides a lithium ion battery with wide temperature range and a preparation method thereof, belonging to the technical field of lithium ion batteries, wherein the lithium ion battery is prepared by taking a positive plate, a negative plate and a diaphragm lamination to form a lamination body, fixing a positive tab and a negative tab on the lamination body, and then packaging, measuring short circuit, pressing an angle, baking, injecting electrolyte, pre-packaging, activating, forming, secondary packaging and grading; the positive plate comprises positive slurry prepared by taking a lithium cobaltate and lithium iron phosphate mixed material as raw materials; the negative plate comprises negative slurry prepared from artificial graphite serving as a raw material. The lithium ion battery can be used under the condition of a wide temperature range of-40-70 ℃, the normal temperature power of the lithium ion battery can reach 5.0 ℃, the lithium ion battery has the characteristic of high rate density, and meanwhile the overcharge performance, the overdischarge performance, the high-temperature short circuit, the thermal shock and the needling safety performance of the lithium ion battery are also ensured.
Description
Technical Field
The invention belongs to the technical field of lithium ion batteries, in particular to a lithium ion battery, and relates to a lithium ion battery with a wide temperature range and a preparation method thereof.
Background
The lithium ion battery as a secondary battery has the characteristics of high capacity, small volume, light weight, long cycle life, no memory effect, no pollution and the like, is widely applied to a plurality of fields such as mobile phones, notebook computers, electric bicycles, electric tools, digital cameras and the like, and along with the high-speed development of the lithium ion battery, the application range of the lithium ion battery is wider and wider.
In recent years, the demand of the global market for low-temperature lithium ion batteries is increased by more than 20 percent year by year, the lithium ion batteries can be discharged at low temperature and sharply reduced due to the chemical characteristics of the lithium ion batteries, the discharge current and the discharge time are greatly limited, so that the battery fails, the low-temperature lithium ion batteries can improve the discharge characteristic at low temperature to a certain extent, but the following problems are that on one hand, if the low-temperature performance of the high-power-density lithium ion batteries is improved, the high-temperature performance is deteriorated, the safety performance of the batteries is greatly influenced, the needling resistance cannot be realized, on the other hand, if the safety performance of the batteries including the needling resistance is met, and the high-temperature performance is correspondingly improved, the high-power discharge at low temperature is difficult to realize, the use of the batteries under the wide temperature range condition (-40 to 70 ℃) and the capacity recovery problem of the lithium ion batteries after storage under the condition of-55 ℃, therefore, the research on the high-power density type lithium ion battery with wide temperature range and high safety and the preparation method thereof is a difficult problem.
Disclosure of Invention
The invention aims to provide a lithium ion battery with a wide temperature range and a preparation method thereof, and aims to solve the existing problems.
In order to achieve the purpose, the invention adopts the technical scheme that: the lithium ion battery with wide temperature range comprises a positive plate, a negative plate, a diaphragm, electrolyte, a positive tab, a negative tab and an aluminum-plastic packaging film; the positive plate comprises positive slurry prepared by taking a lithium cobaltate and lithium iron phosphate mixed material as raw materials and an aluminum foil for coating the positive slurry; the negative plate comprises negative slurry prepared from artificial graphite and copper foil for coating the negative slurry.
As another embodiment of the present application, the cathode slurry comprises 65-69 wt% of cathode solid matter and the rest of amide solvent;
the amide solvent is N-methyl pyrrolidone;
the positive electrode solid matter comprises the following components in parts by weight: 94-96.5 parts of lithium cobaltate and lithium iron phosphate mixed material, 1.3-2.5 parts of conductive agent, 0.7-1.2 parts of conductive carbon black and 1.5-2.3 parts of binder;
the viscosity of the positive electrode slurry is 6000 +/-2000 mPa & s;
the binder is polyvinylidene fluoride.
As another embodiment of the present application, the lithium cobaltate and lithium iron phosphate mixed material is prepared by mixing, by weight, 7-8: 2-3 of lithium cobaltate and lithium iron phosphate.
As another embodiment of the present application, the negative electrode slurry includes 48 to 50 wt% of a negative electrode solid matter and a remaining polar solvent;
the polar solvent is water;
the negative electrode solid matter comprises the following components in parts by weight: 94-96 parts of artificial graphite, 1.2-2.0 parts of a conductive agent, 1.3-2.0 parts of sodium carboxymethylcellulose and 1.5-2.0 parts of a binder, namely an aqueous binder;
the viscosity of the negative electrode slurry is 2000 +/-1000 mPa & s;
the water-based binder is styrene-butadiene latex binder, namely SBR binder.
As another embodiment of the present application, the artificial graphite is prepared by mixing, by weight, 4-6: 4-6, mixing the secondary particle artificial graphite with the small-particle-size secondary particle artificial graphite to obtain the composite material;
the particle size of the secondary particle artificial graphite is 13-17 mu m;
the particle size of the small-particle-size secondary particle artificial graphite is 5.5-9.5 microns.
In another embodiment of the present invention, the diaphragm is formed by coating aluminum oxide ceramic layers with a thickness of 3 to 4 μm on both sides of a base film with a thickness of 9 to 12 μm, and then coating plastic materials with a thickness of 2 to 3 μm on the ceramic layers;
the plastic material is polyvinylidene fluoride;
the base film is made of polyethylene material;
the diaphragm is made of polyethylene material coated with ceramic and rubber on two sides;
the porosity of the diaphragm is 47-50%.
As another embodiment of the present application, the electrolyte comprises, in parts by weight:
lithium salt: lithium hexafluorophosphate (LiPF)6) 12-15 parts of lithium bis (trifluoromethanesulfonyl) imide (LiTFSI) 1-5 parts;
(ii) an organic solvent: 50-55 parts of Ethyl Methyl Carbonate (EMC), 8-12 parts of propyl acetate (EP), 10-15 parts of Ethylene Carbonate (EC) and 3-5 parts of Propylene Carbonate (PC);
③ additive: 0.5-3 parts of Vinylene Carbonate (VC), 0.5-3 parts of Propane Sultone (PS) and 0.5-2 parts of vinyl sulfate (DTD).
The invention also provides a preparation method of the wide-temperature-range lithium ion battery, which comprises the steps of taking the positive plate, the negative plate and the diaphragm lamination to form a lamination body, fixing the positive lug and the negative lug on the lamination body, then filling an aluminum-plastic film, and carrying out packaging, short circuit measurement, angle pressing, baking, electrolyte injection, pre-packaging, activation, formation, secondary packaging and capacity grading to obtain the wide-temperature-range lithium ion battery.
As another embodiment of the application, the activation temperature is 40-45 ℃ and the activation time is 48-60 h;
the activation method comprises the steps of firstly enabling the vertical air bag end of a pre-sealed battery obtained through pre-sealing to face upwards, loading the pre-sealed battery into a liquid injection tray for activation for 20-24 hours, then flatly placing the battery in the tray, enabling the vertical air bag end to face towards the right side of the battery, activating for 14-18 hours, then flatly placing the battery in the tray in a turned-over mode, enabling the vertical air bag end to face towards the left side of the battery, and activating for 14-18 hours.
As another embodiment of the application, the formed surface pressure is 0.2-0.3 mPa, and the temperature is 55 +/-2 ℃;
and standing the activated battery obtained after activation for 3min under the conditions that the surface pressure is 0.2-0.3 mPa and the temperature is 53-57 ℃, then charging for 60min by using a constant current with the current of 0.2C and the voltage of less than or equal to 4.05V, then standing for 1min, and then charging for 50min by using a constant current with the current of 0.6C and the voltage of less than or equal to 4.2V.
The wide-temperature-range lithium ion battery and the preparation method thereof have the beneficial effects that: compared with the prior art, the lithium ion battery can be used under the wide temperature range condition of-40-70 ℃, wherein the discharge capacity of 2.0 ℃ under the condition of-40 ℃ can reach more than 50% of the nominal capacity, the recovery capacity of the lithium ion battery after 48 hours of storage under the condition of 70 ℃ is more than 90%, the recovery capacity of the lithium ion battery after 24 hours of storage under the condition of-55 ℃ is more than 90%, the normal temperature power of the lithium ion battery can reach 5.0 ℃, the lithium ion battery has the characteristic of high rate density, and the overcharge performance, the overdischarge performance, the high-temperature short circuit, the thermal shock and the needling safety performance of the lithium ion battery are also ensured;
according to the invention, the cathode slurry adopts a lithium cobaltate and lithium iron phosphate mixed material, so that the passing rate of overcharge performance, overdischarge performance, high-temperature short circuit, thermal shock and needling safety performance of the lithium ion battery can be effectively improved;
the negative electrode slurry adopts a material system prepared by mixing the secondary particle artificial graphite and the small-particle-size secondary particle artificial graphite, and adopts a laminated structure, so that the obtained lithium ion battery has better normal-temperature rate capability and low-temperature rate capability of-40 ℃, and has high rate density characteristic;
according to the invention, the polyethylene material with ceramic-coated double surfaces is used as the diaphragm and is prepared in a hierarchical coating manner, so that on one hand, the passing rate of overcharge performance, overdischarge performance, high-temperature short circuit, thermal shock and needling safety performance of the lithium ion battery can be improved, on the other hand, a coating layer formed by a plastic material is arranged outside the diaphragm and can be in close contact with the positive and negative pole pieces, the deformation rate of the lithium ion battery is small, and the rate multiplying performance of the lithium ion battery can be improved;
according to the electrolyte adopted by the invention, a certain amount of lithium bistrifluoromethanesulfonimide is added into lithium salt, so that the resistance of an SEI layer formed on the surface of a pole piece at a low temperature can be effectively reduced, and the low-temperature rate performance of a lithium ion battery is improved; meanwhile, the additive is prepared from vinylene carbonate, propane sultone and vinyl sulfate, so that the obtained lithium ion battery has good high and low temperature performance, the ballooning of the lithium ion battery after high-temperature storage is prevented, the charge and discharge performance and the cycle life of the lithium ion battery are improved, and the capacity of the lithium ion battery can be recovered by more than 90% after the lithium ion battery is used under a wide temperature range condition (-40-70 ℃) and stored under a-55 ℃ condition.
By adopting the positive electrode slurry, the polyethylene material coated with ceramic and glue on two sides and the specific electrolyte to be matched with each other, the passing rate of the overcharge performance, the overdischarge performance, the high-temperature short circuit and the thermal shock safety performance of the lithium ion battery is ensured to be 100 percent, the needling passing rate of the lithium ion battery is obviously improved, and the lithium ion battery has high safety characteristic;
in the preparation process of the lithium ion battery, the wettability of the electrolyte is effectively improved, the liquid retention amount of the electrolyte is improved and the cycle performance of the lithium ion battery is obviously improved by optimizing the activation mode, the activation temperature and the activation time;
in the preparation process of the lithium ion battery, the invention ensures that the lithium ion battery forms a compact and uniform SEI film on the surface of the negative electrode graphite by optimizing the formation temperature and time, and effectively improves the low-temperature performance of the lithium ion battery under the high-power condition.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more apparent, the present invention is further described in detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
The embodiment provides a preparation method of a lithium ion battery with a wide temperature range, which comprises the following specific steps:
preparing a positive plate:
mixing 7.52kg of lithium cobaltate and 1.88kg of lithium iron phosphate (the weight ratio of the lithium cobaltate to the lithium iron phosphate is 8: 2) to obtain a lithium cobaltate and lithium iron phosphate mixed material;
mixing 9.4kg of lithium cobaltate and lithium iron phosphate mixed material, 0.25kg of conductive agent SP, 0.12kg of conductive carbon black ECP and 0.23kg of polyvinylidene fluoride binder by dry powder, stirring in a mud shape and stirring at high viscosity, and adjusting the viscosity to 5600mpa.s to obtain a solid substance of the positive electrode;
then the ratio of 65: 35, uniformly stirring and mixing the solid matter of the positive electrode and N-methylpyrrolidone (NMP) to obtain positive electrode slurry;
and coating the positive electrode slurry on the surface of the aluminum foil to obtain the positive electrode plate.
Preparing a negative plate:
mixing 3.76kg of secondary particle artificial graphite with the particle size of 13-17 mu m and 5.64kg of small-particle-size secondary particle artificial graphite with the particle size of 5.5-9.5 mu m (the weight ratio of the secondary particle artificial graphite to the small-particle-size secondary particle artificial graphite is 4: 6) to obtain artificial graphite;
mixing 9.4kg of artificial graphite, 0.20kg of conductive agent SP, 0.20kg of sodium carboxymethyl cellulose and 0.20kg of SBR binder (styrene butadiene rubber latex binder), stirring the mixture in a dry powder manner, stirring the mixture in a mud state, stirring CMC, stirring the mixture with high viscosity, and adjusting the viscosity to 2000mpa.s to obtain a solid matter of the negative electrode;
then, the method proceeds with the following steps of 48: 52, uniformly stirring and mixing the solid matter of the negative electrode and water to obtain negative electrode slurry;
and coating the negative electrode slurry on the surface of the copper foil to obtain the negative electrode sheet.
Preparing a diaphragm:
the polyethylene material with the thickness of 9 mu m is taken as a base film, aluminum oxide ceramic layers with the thickness of 4 mu m are respectively coated on the two sides of the base film, and polyvinylidene fluoride with the thickness of 2 mu m is respectively coated on the ceramic layers, so that the polyethylene material with the ceramic glue coated on the two sides is obtained, the thickness of 21 mu m and the porosity of 47 percent.
Preparing an electrolyte:
1.3kg of lithium hexafluorophosphate (LiPF) was taken6) And 0.2kg of lithium bistrifluoromethanesulfonimide (LiTFSI) as a lithium salt for standby;
taking 5.4kg of Ethyl Methyl Carbonate (EMC), 1.2kg of propyl acetate (EP), 1.3kg of Ethylene Carbonate (EC) and 0.4kg of Propylene Carbonate (PC) as organic solvents for standby;
taking 0.05kg of Vinylene Carbonate (VC), 0.05kg of Propane Sultone (PS) and 0.1kg of vinyl sulfate (DTD) as additives for later use;
and uniformly mixing the lithium salt, the organic solvent and the additive to obtain the electrolyte.
Preparing the lithium ion battery with wide temperature range:
laminating the positive plate and the negative plate after die cutting with a diaphragm to form a laminated body, welding the positive electrode lug and the negative electrode lug on the laminated body, then loading an aluminum plastic film, packaging, measuring short circuit, pressing an angle, baking to form a semi-finished product battery cell, injecting electrolyte into the obtained semi-finished product battery cell, and performing pre-sealing, activation, formation, secondary packaging and capacity grading to obtain the laminated flexible-packaged wide-temperature-range lithium ion battery.
The activation is carried out in three sections in total at the temperature of 40 ℃ for 48 hours, the vertical air bag end of the pre-sealed battery obtained by pre-sealing is upward, the pre-sealed battery is placed in a liquid injection tray for activation for 20 hours, the battery is horizontally placed in the tray, the vertical air bag end faces the right side of the battery and is activated for 14 hours, then the battery is turned over and horizontally placed in the tray, the vertical air bag end faces the left side of the battery and is activated for 14 hours;
the formation is carried out by adopting a high-temperature pressure formation mode, and the specific steps are that the activated battery obtained after activation is stood for 3min under the conditions that the surface pressure is 0.2mPa and the temperature is 55 ℃, then the battery is charged for 60min by constant current with the current of 0.2C and the voltage of less than or equal to 4.05V, then the battery is stood for 1min, and then the battery is charged for 50min by constant current with the current of 0.6C and the voltage of less than or equal to 4.2V.
Example 2
The embodiment provides a preparation method of a lithium ion battery with a wide temperature range, which comprises the following specific steps:
preparing a positive plate:
mixing 7.125kg of lithium cobaltate and 2.375kg of lithium iron phosphate (the weight ratio of the lithium cobaltate to the lithium iron phosphate is 7.5: 2.5) to obtain a lithium cobaltate and lithium iron phosphate mixed material;
mixing 9.5kg of lithium cobaltate and lithium iron phosphate mixed material, 0.18kg of conductive agent SP, 0.10kg of conductive carbon black ECP and 0.22kg of polyvinylidene fluoride binder, and stirring the mixture in a dry powder manner, stirring the mixture in a mud state and stirring the mixture with high viscosity to adjust the viscosity to 6000mpa.s to obtain a solid substance of the positive electrode;
then, the ratio of 67: 33, uniformly stirring and mixing the solid matter of the positive electrode and N-methyl pyrrolidone (NMP) to obtain positive electrode slurry;
and coating the positive electrode slurry on the surface of the aluminum foil to obtain the positive electrode plate.
Preparing a negative plate:
mixing 4.75kg of secondary particle artificial graphite with the particle size of 13-17 mu m and 4.75kg of small-particle-size secondary particle artificial graphite with the particle size of 5.5-9.5 mu m (the weight ratio of the secondary particle artificial graphite to the small-particle-size secondary particle artificial graphite is 5: 5) to obtain artificial graphite;
taking 9.5kg of artificial graphite, 0.15kg of conductive agent SP, 0.17kg of sodium carboxymethyl cellulose and 0.18kg of SBR binder, and mixing dry powder, stirring in a mud shape, stirring by CMC, stirring in a high viscosity, and adjusting the viscosity to 2000mpa.s to obtain a solid matter of the negative electrode;
then, at 49: 51, uniformly stirring and mixing the solid matter of the negative electrode and water to obtain negative electrode slurry;
and coating the negative electrode slurry on the surface of the copper foil to obtain the negative electrode sheet.
Preparing a diaphragm:
the polyethylene material with the thickness of 10 mu m is taken as a base film, the two sides of the base film are respectively coated with an alumina ceramic layer with the thickness of 3 mu m, and then the ceramic layers are respectively coated with polyvinylidene fluoride with the thickness of 3 mu m, so that the polyethylene material with the ceramic glue coated on the two sides is obtained, the thickness is 22 mu m, and the porosity is 48%.
Preparing an electrolyte:
1.2kg of lithium hexafluorophosphate (LiPF) was taken6) And 0.4kg of lithium bistrifluoromethanesulfonimide (LiTFSI) as a lithium salt for standby;
taking 5.5kg of Ethyl Methyl Carbonate (EMC), 1.0kg of propyl acetate (EP), 1.2kg of Ethylene Carbonate (EC) and 0.3kg of Propylene Carbonate (PC) as organic solvents for standby;
taking 0.1kg of Vinylene Carbonate (VC), 0.2kg of Propane Sultone (PS) and 0.1kg of vinyl sulfate (DTD) as additives for later use;
and uniformly mixing the lithium salt, the organic solvent and the additive to obtain the electrolyte.
Preparing the lithium ion battery with wide temperature range:
laminating the positive plate and the negative plate after die cutting with a diaphragm to form a laminated body, welding the positive electrode lug and the negative electrode lug on the laminated body, then loading an aluminum plastic film, packaging, measuring short circuit, pressing an angle, baking to form a semi-finished product battery cell, injecting electrolyte into the obtained semi-finished product battery cell, and performing pre-sealing, activation, formation, secondary packaging and capacity grading to obtain the laminated flexible-packaged wide-temperature-range lithium ion battery.
The activation is carried out in three sections in total at the temperature of 40 ℃ and the time of 56 hours, firstly, the vertical air bag end of the pre-sealed battery obtained by pre-sealing is upward, the pre-sealed battery is placed in a liquid injection tray for activation for 20 hours, then, the battery is horizontally placed in the tray, the vertical air bag end faces the right side of the battery and is activated for 18 hours, then, the battery is horizontally placed in the tray with the upside down, and the vertical air bag end faces the left side of the battery and is activated for 18 hours;
the formation is carried out by adopting a high-temperature pressure formation mode, and the specific steps are that the activated battery obtained after activation is stood for 3min under the conditions that the surface pressure is 0.3mPa and the temperature is 55 ℃, then the battery is charged for 60min by constant current with the current of 0.2C and the voltage of less than or equal to 4.05V, then the battery is stood for 1min, and then the battery is charged for 50min by constant current with the current of 0.6C and the voltage of less than or equal to 4.2V.
Example 3
The embodiment provides a preparation method of a lithium ion battery with a wide temperature range, which comprises the following specific steps:
preparing a positive plate:
6.755kg of lithium cobaltate and 2.895kg of lithium iron phosphate are mixed (the weight ratio of the lithium cobaltate to the lithium iron phosphate is 7: 3) to obtain a lithium cobaltate and lithium iron phosphate mixed material;
mixing 9.65kg of lithium cobaltate and lithium iron phosphate mixed material, 0.13kg of conductive agent SP, 0.07kg of conductive carbon black ECP and 0.15kg of polyvinylidene fluoride binder by dry powder, stirring in a mud shape and stirring at high viscosity, and adjusting the viscosity to 6500mpa.s to obtain a solid substance of the positive electrode;
then, at 69: 31, uniformly stirring and mixing the solid matter of the positive electrode and N-methyl pyrrolidone (NMP) to obtain positive electrode slurry;
and coating the positive electrode slurry on the surface of the aluminum foil to obtain the positive electrode plate.
Preparing a negative plate:
mixing 5.76kg of secondary particle artificial graphite with the particle size of 13-17 mu m and 3.84kg of small-particle-size secondary particle artificial graphite with the particle size of 5.5-9.5 mu m (the weight ratio of the secondary particle artificial graphite to the small-particle-size secondary particle artificial graphite is 6: 4) to obtain artificial graphite;
taking 9.6kg of artificial graphite, 0.12kg of conductive agent SP, 0.13kg of sodium carboxymethyl cellulose and 0.15kg of SBR binder, and adjusting the viscosity to 2600mpa.s by dry powder mixing, mud stirring, CMC stirring and high-viscosity stirring to obtain a negative electrode solid matter;
then, the ratio of 50: stirring and uniformly mixing the solid matter of the negative electrode and water according to the proportion of 50 to obtain negative electrode slurry;
and coating the negative electrode slurry on the surface of the copper foil to obtain the negative electrode sheet.
Preparing a diaphragm:
the polyethylene material with the thickness of 12 mu m is taken as a base film, aluminum oxide ceramic layers with the thickness of 4 mu m are respectively coated on the two sides of the base film, and polyvinylidene fluoride with the thickness of 3 mu m is respectively coated on the ceramic layers, so that the polyethylene material with the ceramic glue coated on the two sides is obtained, the thickness is 26 mu m, and the porosity is 50%.
Preparing an electrolyte:
1.4kg of lithium hexafluorophosphate (LiPF) was taken6) And 0.1kg of lithium bistrifluoromethanesulfonimide (LiTFSI) as a lithium salt for standby;
taking 5.0kg of Ethyl Methyl Carbonate (EMC), 0.8kg of propyl acetate (EP), 1.5kg of Ethylene Carbonate (EC) and 0.5kg of Propylene Carbonate (PC) as organic solvents for standby;
taking 0.25kg of Vinylene Carbonate (VC), 0.25kg of Propane Sultone (PS) and 0.2kg of vinyl sulfate (DTD) as additives for later use;
and uniformly mixing the lithium salt, the organic solvent and the additive to obtain the electrolyte.
Preparing the lithium ion battery with wide temperature range:
laminating the positive plate and the negative plate after die cutting with a diaphragm to form a laminated body, welding the positive electrode lug and the negative electrode lug on the laminated body, then loading an aluminum plastic film, packaging, measuring short circuit, pressing an angle, baking to form a semi-finished product battery cell, injecting electrolyte into the obtained semi-finished product battery cell, and performing pre-sealing, activation, formation, secondary packaging and capacity grading to obtain the laminated flexible-packaged wide-temperature-range lithium ion battery.
The activation is carried out in three sections, namely, the vertical air bag end of a pre-sealed battery obtained by pre-sealing is upward, the pre-sealed battery is placed in a liquid injection tray and is activated for 24 hours, the battery is horizontally placed in the tray, the vertical air bag end faces the right side of the battery and is activated for 18 hours, then the battery is turned over and is horizontally placed in the tray, the vertical air bag end faces the left side of the battery, and the battery is activated for 18 hours;
the formation is carried out by adopting a high-temperature pressure formation mode, and the specific steps are that the activated battery obtained after activation is stood for 3min under the conditions that the surface pressure is 0.3mPa and the temperature is 55 ℃, then the battery is charged for 60min by constant current with the current of 0.2C and the voltage of less than or equal to 4.05V, then the battery is stood for 1min, and then the battery is charged for 50min by constant current with the current of 0.6C and the voltage of less than or equal to 4.2V.
Example 4
The embodiment provides a preparation method of a lithium ion battery with a wide temperature range, which comprises the following specific steps:
preparing a positive plate:
6.755kg of lithium cobaltate and 2.895kg of lithium iron phosphate are mixed (the weight ratio of the lithium cobaltate to the lithium iron phosphate is 7: 3) to obtain a lithium cobaltate and lithium iron phosphate mixed material;
mixing 9.65kg of lithium cobaltate and lithium iron phosphate mixed material, 0.13kg of conductive agent SP, 0.07kg of conductive carbon black ECP and 0.15kg of polyvinylidene fluoride binder by dry powder, stirring in a mud shape and stirring at high viscosity, and adjusting the viscosity to 6500mpa.s to obtain a solid substance of the positive electrode;
then, at 69: 31, uniformly stirring and mixing the solid matter of the positive electrode and N-methyl pyrrolidone (NMP) to obtain positive electrode slurry;
and coating the positive electrode slurry on the surface of the aluminum foil to obtain the positive electrode plate.
Preparing a negative plate:
mixing 5.76kg of secondary particle artificial graphite with the particle size of 13-17 mu m and 3.84kg of small-particle-size secondary particle artificial graphite with the particle size of 5.5-9.5 mu m (the weight ratio of the secondary particle artificial graphite to the small-particle-size secondary particle artificial graphite is 6: 4) to obtain artificial graphite;
taking 9.6kg of artificial graphite, 0.12kg of conductive agent SP, 0.13kg of sodium carboxymethyl cellulose and 0.15kg of SBR binder, and adjusting the viscosity to 2600mpa.s by dry powder mixing, mud stirring, CMC stirring and high-viscosity stirring to obtain a negative electrode solid matter;
then, the ratio of 50: stirring and uniformly mixing the solid matter of the negative electrode and water according to the proportion of 50 to obtain negative electrode slurry;
and coating the negative electrode slurry on the surface of the copper foil to obtain the negative electrode sheet.
Preparing a diaphragm:
the polyethylene material with the thickness of 12 mu m is taken as a base film, aluminum oxide ceramic layers with the thickness of 4 mu m are respectively coated on the two sides of the base film, and polyvinylidene fluoride with the thickness of 3 mu m is respectively coated on the ceramic layers, so that the polyethylene material with the ceramic glue coated on the two sides is obtained, the thickness is 26 mu m, and the porosity is 50%.
Preparing an electrolyte:
1.5kg of lithium hexafluorophosphate (LiPF) was taken6) And 0.5kg of lithium bistrifluoromethanesulfonimide (LiTFSI) as a lithium salt for standby;
taking 5.0kg of Ethyl Methyl Carbonate (EMC), 0.85kg of propyl acetate (EP), 1.0kg of Ethylene Carbonate (EC) and 0.5kg of Propylene Carbonate (PC) as organic solvents for standby;
taking 0.3kg of Vinylene Carbonate (VC), 0.3kg of Propane Sultone (PS) and 0.05kg of vinyl sulfate (DTD) as additives for later use;
and uniformly mixing the lithium salt, the organic solvent and the additive to obtain the electrolyte.
Preparing the lithium ion battery with wide temperature range:
laminating the positive plate and the negative plate after die cutting with a diaphragm to form a laminated body, welding the positive electrode lug and the negative electrode lug on the laminated body, then loading an aluminum plastic film, packaging, measuring short circuit, pressing an angle, baking to form a semi-finished product battery cell, injecting electrolyte into the obtained semi-finished product battery cell, and performing pre-sealing, activation, formation, secondary packaging and capacity grading to obtain the laminated flexible-packaged wide-temperature-range lithium ion battery.
The activation is carried out in three sections, namely, the vertical air bag end of a pre-sealed battery obtained by pre-sealing is upward, the pre-sealed battery is placed in a liquid injection tray and is activated for 24 hours, the battery is horizontally placed in the tray, the vertical air bag end faces the right side of the battery and is activated for 18 hours, then the battery is turned over and is horizontally placed in the tray, the vertical air bag end faces the left side of the battery, and the battery is activated for 18 hours;
the formation is carried out by adopting a high-temperature pressure formation mode, and the specific steps are that the activated battery obtained after activation is stood for 3min under the conditions that the surface pressure is 0.3mPa and the temperature is 55 ℃, then the battery is charged for 60min by constant current with the current of 0.2C and the voltage of less than or equal to 4.05V, then the battery is stood for 1min, and then the battery is charged for 50min by constant current with the current of 0.6C and the voltage of less than or equal to 4.2V.
Comparative example 1
Comparative example 1 is a comparative experiment to example 1, differing only in that: comparative example 1 lithium cobaltate was used in place of the lithium cobaltate and lithium iron phosphate co-doped material (i.e., lithium iron phosphate was not used) in the preparation of the solid matter of the positive electrode.
Comparative example 2
Comparative example 2 is a comparative experiment to example 1, differing only in that: comparative example 2 in the preparation of the solid matter of the negative electrode, artificial graphite of secondary particles having a particle size of 13 to 17 μm was used instead of artificial graphite (i.e., small-particle-size secondary particles were not used).
Comparative example 3
Comparative example 3 is a comparative experiment to example 1, differing only in that: in comparative example 3, a double-sided ceramic diaphragm was used as a diaphragm instead of a polyethylene material coated with ceramic paste on both sides (i.e., polyvinylidene fluoride was not coated during the diaphragm preparation process).
Comparative example 4
Comparative example 4 is a comparative experiment to example 1, differing only in that: comparative example 4 conventional activation was used instead of staged activation during the preparation of wide temperature range lithium ion batteries.
Comparative example 5
Comparative example 5 is a comparative experiment to example 1, differing only in that: comparative example 5 in the preparation process of the lithium ion battery of wide temperature range, the conventional formation was used instead of the high temperature press formation.
Experimental example 1
The lithium ion batteries with wide temperature ranges prepared in examples 1-3 and comparative examples 1-5 were respectively subjected to capacity grading and then cell performance tests, and the specific test results are as follows
Table 1 summary of performance test results of lithium ion batteries
As can be seen from Table 1, the lithium ion battery with wide temperature range and high safety, which is prepared by the invention, is a high-power density type lithium ion battery with wide temperature range and high safety, and can be used under the wide temperature range condition of-40 ℃ to 70 ℃, wherein the 2.0C discharge capacity under the condition of-40 ℃ can reach more than 50 percent of the nominal capacity, the battery recovery capacity after 48 hours of storage under the condition of 70 ℃ is more than 90 percent, in addition, the recovery capacity after 24 hours of storage under the condition of-55 ℃ is more than 90 percent, and the normal temperature power can reach 5.0C, so that the lithium ion battery has the characteristic of high rate density; meanwhile, the overcharge performance, the overdischarge performance, the high-temperature short circuit, the thermal shock and the needling safety performance are ensured.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A lithium ion battery with wide temperature range comprises a positive plate, a negative plate, a diaphragm and electrolyte, and is characterized in that the positive plate comprises positive slurry prepared by taking a lithium cobaltate and lithium iron phosphate mixed material as raw materials; the negative plate comprises negative slurry prepared from artificial graphite serving as a raw material.
2. The wide temperature range lithium ion battery of claim 1, wherein the positive electrode slurry comprises 65-69 wt% of positive electrode solid matter and the remaining amide solvent;
the positive electrode solid matter comprises the following components in parts by weight: 94-96.5 parts of lithium cobaltate and lithium iron phosphate mixed material, 1.3-2.5 parts of conductive agent, 0.7-1.2 parts of conductive carbon black and 1.5-2.3 parts of binder.
3. The wide temperature range lithium ion battery according to claim 1 or 2, wherein the lithium cobaltate and lithium iron phosphate mixed material is prepared by mixing the following components in a weight ratio of 7-8: 2-3 of lithium cobaltate and lithium iron phosphate.
4. The wide temperature range lithium ion battery of claim 1, wherein the negative electrode slurry comprises 48-50 wt% negative electrode solid matter and the remaining polar solvent;
the negative electrode solid matter comprises the following components in parts by weight: 94-96 parts of artificial graphite, 1.2-2.0 parts of a conductive agent, 1.3-2.0 parts of sodium carboxymethylcellulose and 1.5-2.0 parts of a binder.
5. The wide temperature range lithium ion battery according to claim 1 or 4, wherein the artificial graphite is prepared by mixing, by weight, 4-6: 4-6, mixing the secondary particle artificial graphite with the small-particle-size secondary particle artificial graphite to obtain the composite material;
the particle size of the secondary particle artificial graphite is 13-17 mu m;
the particle size of the small-particle-size secondary particle artificial graphite is 5.5-9.5 microns.
6. The wide temperature range lithium ion battery according to claim 1, 2 or 4, wherein the separator is formed by coating a ceramic layer on each side of the base film and then coating a plastic material on each ceramic layer.
7. The wide temperature range lithium ion battery of claim 1, 2, or 4, wherein the electrolyte comprises, in parts by weight:
lithium salt: 12-15 parts of lithium hexafluorophosphate and 1-5 parts of lithium bistrifluoromethanesulfonimide;
(ii) an organic solvent: 50-55 parts of methyl ethyl carbonate, 8-12 parts of propyl acetate, 10-15 parts of ethylene carbonate and 3-5 parts of propylene carbonate;
③ additive: 0.5-3 parts of vinylene carbonate, 0.5-3 parts of propane sultone and 0.5-2 parts of vinyl sulfate.
8. A preparation method of a wide-temperature-range lithium ion battery is characterized in that a positive plate, a negative plate and a diaphragm laminated sheet are taken to form a laminated sheet body, a positive lug and a negative lug are fixed on the laminated sheet body, and then the wide-temperature-range lithium ion battery is obtained through packaging, short circuit measurement, angle pressing, baking, electrolyte injection, pre-sealing, activation, formation, secondary packaging and capacity grading.
9. The method of claim 8, wherein the activation temperature is 40-45 ℃ and the activation time is 48-60 hours.
10. The method according to claim 8 or 9, wherein the formation pressure is 0.2 to 0.3mPa and the temperature is 55 ± 2 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111314159.7A CN114203985A (en) | 2021-11-08 | 2021-11-08 | Lithium ion battery with wide temperature range and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111314159.7A CN114203985A (en) | 2021-11-08 | 2021-11-08 | Lithium ion battery with wide temperature range and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114203985A true CN114203985A (en) | 2022-03-18 |
Family
ID=80647296
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111314159.7A Pending CN114203985A (en) | 2021-11-08 | 2021-11-08 | Lithium ion battery with wide temperature range and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114203985A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115000631A (en) * | 2022-05-16 | 2022-09-02 | 万向一二三股份公司 | High-power lithium battery with long calendar life and manufacturing method thereof |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103700863A (en) * | 2013-12-10 | 2014-04-02 | 中山市电赢科技有限公司 | High-multiplying-power flexibly-packaged lithium ion secondary battery and preparation method thereof |
| CN104201414A (en) * | 2014-08-29 | 2014-12-10 | 深圳华粤宝电池有限公司 | Lithium ion battery as well as preparation method thereof and charge method of lithium ion battery |
| CN107851795A (en) * | 2015-12-23 | 2018-03-27 | 株式会社Lg化学 | Cathode active material and the negative electrode for lithium secondary battery for including it |
| JP2019029088A (en) * | 2017-07-26 | 2019-02-21 | 三洋化成工業株式会社 | Electrolyte for lithium ion secondary battery and lithium ion secondary battery |
| RU2017146442A (en) * | 2017-12-28 | 2019-06-28 | Касенко Андрей Леонидович | LITHIUM-ION ACCUMULATOR WITH LOW TEMPERATURE EXTENDED OPERATING RANGE OF TEMPERATURES |
| JP2019175577A (en) * | 2018-03-27 | 2019-10-10 | 三井化学株式会社 | Nonaqueous electrolyte solution for battery and lithium secondary battery |
| CN110444758A (en) * | 2019-07-18 | 2019-11-12 | 重庆市维都利新能源有限公司 | A kind of wide temperature range fast charging type lithium ion battery of high voltage and preparation method thereof |
| CN112448014A (en) * | 2020-12-05 | 2021-03-05 | 隆能科技(南通)有限公司 | Ultralow-temperature high-capacity secondary lithium battery and preparation method thereof |
| CN112687951A (en) * | 2020-11-24 | 2021-04-20 | 风帆有限责任公司 | Low-temperature-resistant high-voltage type soft package lithium ion battery and preparation method thereof |
-
2021
- 2021-11-08 CN CN202111314159.7A patent/CN114203985A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103700863A (en) * | 2013-12-10 | 2014-04-02 | 中山市电赢科技有限公司 | High-multiplying-power flexibly-packaged lithium ion secondary battery and preparation method thereof |
| CN104201414A (en) * | 2014-08-29 | 2014-12-10 | 深圳华粤宝电池有限公司 | Lithium ion battery as well as preparation method thereof and charge method of lithium ion battery |
| CN107851795A (en) * | 2015-12-23 | 2018-03-27 | 株式会社Lg化学 | Cathode active material and the negative electrode for lithium secondary battery for including it |
| JP2019029088A (en) * | 2017-07-26 | 2019-02-21 | 三洋化成工業株式会社 | Electrolyte for lithium ion secondary battery and lithium ion secondary battery |
| RU2017146442A (en) * | 2017-12-28 | 2019-06-28 | Касенко Андрей Леонидович | LITHIUM-ION ACCUMULATOR WITH LOW TEMPERATURE EXTENDED OPERATING RANGE OF TEMPERATURES |
| JP2019175577A (en) * | 2018-03-27 | 2019-10-10 | 三井化学株式会社 | Nonaqueous electrolyte solution for battery and lithium secondary battery |
| CN110444758A (en) * | 2019-07-18 | 2019-11-12 | 重庆市维都利新能源有限公司 | A kind of wide temperature range fast charging type lithium ion battery of high voltage and preparation method thereof |
| CN112687951A (en) * | 2020-11-24 | 2021-04-20 | 风帆有限责任公司 | Low-temperature-resistant high-voltage type soft package lithium ion battery and preparation method thereof |
| CN112448014A (en) * | 2020-12-05 | 2021-03-05 | 隆能科技(南通)有限公司 | Ultralow-temperature high-capacity secondary lithium battery and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 许广举等: "《汽车动力与传动技术》", 西安电子科技大学出版社, pages: 135 - 136 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115000631A (en) * | 2022-05-16 | 2022-09-02 | 万向一二三股份公司 | High-power lithium battery with long calendar life and manufacturing method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106654363B (en) | A kind of composite solid polymer electrolyte and solid lithium battery | |
| US11749793B2 (en) | All-solid-state battery and preparation method therefor | |
| CN111193071A (en) | Electrolyte of high-voltage quick-charging lithium ion battery and lithium ion battery | |
| US20210249650A1 (en) | Negative electrode sheet and secondary battery | |
| EP3916848B1 (en) | Secondary battery, battery module having same, battery pack, and device | |
| CN1222063C (en) | Lithium ion cell, electrode of lithium ion cell and its preparation method | |
| CN103594735B (en) | A kind of preparation method of lithium titanate lithium ion battery | |
| US20230361305A1 (en) | Aqueous positive electrode sheet, and secondary battery including the electrode sheet, and power consumption apparatus | |
| CN112151865B (en) | Electrolyte for lithium ion battery and lithium ion battery comprising same | |
| WO2018059180A1 (en) | High-power, high-energy chemical power supply and preparation method therefor | |
| CN112005418A (en) | Electrolyte and electrochemical device | |
| CN114335420A (en) | Lithium-supplementing safety coating, positive pole piece and lithium ion battery | |
| CN101826640B (en) | Pole core for lithium ion battery and lithium ion battery using pole core | |
| CN111883765A (en) | Lithium battery positive active material, preparation method thereof and lithium battery | |
| CN114744294A (en) | Electrochemical device and electronic device | |
| CN107785537B (en) | Novel lithium ion battery positive pole piece, application thereof and modification method of pole piece | |
| CN114203985A (en) | Lithium ion battery with wide temperature range and preparation method thereof | |
| CN112687951B (en) | Low-temperature-resistant high-voltage type soft package lithium ion battery and preparation method thereof | |
| CN113471512A (en) | Low-temperature lithium battery | |
| CN112599861A (en) | Preparation method of lithium cobaltate power battery | |
| CN112002935A (en) | Lithium ion battery and manufacturing method thereof | |
| CN108155384B (en) | Inorganic binder lithium ion battery | |
| CN114122406B (en) | Preparation method of graphene modified lithium iron phosphate and lithium iron phosphate | |
| CN111509189A (en) | Positive pole piece and lithium ion battery | |
| CN115036458B (en) | Lithium ion battery |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |