CN110311104A - A kind of slurry and preparation method, cathode pole piece, lithium ion battery - Google Patents
A kind of slurry and preparation method, cathode pole piece, lithium ion battery Download PDFInfo
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- CN110311104A CN110311104A CN201910534514.8A CN201910534514A CN110311104A CN 110311104 A CN110311104 A CN 110311104A CN 201910534514 A CN201910534514 A CN 201910534514A CN 110311104 A CN110311104 A CN 110311104A
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- Prior art keywords
- slurry
- pole piece
- graphite
- cathode pole
- aluminium hydroxide
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- 239000002002 slurry Substances 0.000 title claims abstract description 83
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 27
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 27
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- 238000007613 slurry method Methods 0.000 title abstract description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 83
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 66
- 239000010439 graphite Substances 0.000 claims abstract description 66
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims abstract description 42
- 229910021502 aluminium hydroxide Inorganic materials 0.000 claims abstract description 42
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 25
- 239000003792 electrolyte Substances 0.000 claims abstract description 10
- 239000002562 thickening agent Substances 0.000 claims abstract description 8
- 239000011230 binding agent Substances 0.000 claims abstract description 7
- 239000006258 conductive agent Substances 0.000 claims abstract description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 24
- 238000000034 method Methods 0.000 claims description 23
- 239000011889 copper foil Substances 0.000 claims description 16
- 239000000839 emulsion Substances 0.000 claims description 12
- 229910052802 copper Inorganic materials 0.000 claims description 8
- 239000010949 copper Substances 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 8
- 239000000706 filtrate Substances 0.000 claims description 8
- 238000001027 hydrothermal synthesis Methods 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 8
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical group [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims description 7
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 claims description 7
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 7
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims description 7
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims description 7
- 239000006230 acetylene black Substances 0.000 claims description 5
- 239000012266 salt solution Substances 0.000 claims description 5
- 229920001909 styrene-acrylic polymer Polymers 0.000 claims description 5
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 claims description 4
- 229910021393 carbon nanotube Inorganic materials 0.000 claims description 4
- 239000002041 carbon nanotube Substances 0.000 claims description 4
- 229920001577 copolymer Polymers 0.000 claims description 4
- 229910021389 graphene Inorganic materials 0.000 claims description 4
- 229920002239 polyacrylonitrile Polymers 0.000 claims description 4
- BNGXYYYYKUGPPF-UHFFFAOYSA-M (3-methylphenyl)methyl-triphenylphosphanium;chloride Chemical compound [Cl-].CC1=CC=CC(C[P+](C=2C=CC=CC=2)(C=2C=CC=CC=2)C=2C=CC=CC=2)=C1 BNGXYYYYKUGPPF-UHFFFAOYSA-M 0.000 claims description 3
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 3
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 claims description 3
- COOGPNLGKIHLSK-UHFFFAOYSA-N aluminium sulfide Chemical compound [Al+3].[Al+3].[S-2].[S-2].[S-2] COOGPNLGKIHLSK-UHFFFAOYSA-N 0.000 claims description 3
- 229910000329 aluminium sulfate Inorganic materials 0.000 claims description 2
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims 1
- 159000000013 aluminium salts Chemical class 0.000 claims 1
- 239000007788 liquid Substances 0.000 claims 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract description 13
- 229910052744 lithium Inorganic materials 0.000 abstract description 13
- 230000000694 effects Effects 0.000 abstract description 3
- 239000011888 foil Substances 0.000 abstract description 2
- 239000007770 graphite material Substances 0.000 abstract description 2
- 238000005213 imbibition Methods 0.000 abstract description 2
- 238000010406 interfacial reaction Methods 0.000 abstract description 2
- 230000010287 polarization Effects 0.000 abstract description 2
- 238000004904 shortening Methods 0.000 abstract description 2
- 238000004458 analytical method Methods 0.000 description 8
- 239000000463 material Substances 0.000 description 8
- HFCVPDYCRZVZDF-UHFFFAOYSA-N [Li+].[Co+2].[Ni+2].[O-][Mn]([O-])(=O)=O Chemical compound [Li+].[Co+2].[Ni+2].[O-][Mn]([O-])(=O)=O HFCVPDYCRZVZDF-UHFFFAOYSA-N 0.000 description 6
- KFDQGLPGKXUTMZ-UHFFFAOYSA-N [Mn].[Co].[Ni] Chemical compound [Mn].[Co].[Ni] KFDQGLPGKXUTMZ-UHFFFAOYSA-N 0.000 description 6
- 238000005520 cutting process Methods 0.000 description 6
- 239000000243 solution Substances 0.000 description 5
- 239000004575 stone Substances 0.000 description 4
- 229920002125 Sokalan® Polymers 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical class [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 238000005253 cladding Methods 0.000 description 3
- 239000004584 polyacrylic acid Substances 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 229910002651 NO3 Inorganic materials 0.000 description 1
- 229910021383 artificial graphite Inorganic materials 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 239000002001 electrolyte material Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 239000006210 lotion Substances 0.000 description 1
- 239000007773 negative electrode material Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000011164 primary particle Substances 0.000 description 1
- 229910021384 soft carbon Inorganic materials 0.000 description 1
- 238000004073 vulcanization 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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- 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
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/131—Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
-
- 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
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/133—Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
-
- 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
- H01M4/366—Composites as layered products
-
- 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
- H01M4/483—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides for non-aqueous cells
-
- 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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/624—Electric conductive fillers
- H01M4/625—Carbon or graphite
-
- 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
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/628—Inhibitors, e.g. gassing inhibitors, corrosion inhibitors
-
- 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
- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
- H01M2004/027—Negative electrodes
-
- 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
Abstract
The present invention relates to field of lithium ion battery, disclosing a kind of slurry and preparation method, cathode pole piece, lithium ion battery, slurry includes: slurry 46-54%, water 46-54% by mass fraction；Slurry includes: aluminium hydroxide coated graphite 93.5-95.5%, conductive agent 2-3%, thickener 1-1.5%, binder 1.5-2% by mass fraction.Slurry is coated in negative electrode metallic foil on piece and forms cathode pole piece, has very fast charging rate with the lithium ion battery that the cathode pole piece assembles；Slurry improves the wellability of pole piece and electrolyte interface, improves the liquid-keeping property of interface, increases interface imbibition effect, improves the interfacial reaction impedance of lithium ion, to effectively improve the embedding lithium kinetic characteristics of graphite material, reduces charging polarization；It is significantly promoted so that having on quick charge capability and shortening charging time etc..
Description
Technical field
The present invention relates to technical field of lithium ion more particularly to a kind of slurry and preparation method, cathode pole piece, lithium from
Sub- battery and preparation method thereof.
Background technique
With output voltage is high, energy density is big, self discharge is small, memory-less effect, good cycle, operating temperature range
Width and it is environmentally friendly the advantages that lithium ion battery, be widely used to portable electronic product and consumer electronics and produce
In product, and in recent years along with the development of electric car and its technology is able to fast development.
Lithium ion battery is mainly made of anode, cathode, diaphragm and electrolyte material.Wherein, positive and negative pole material is to battery
Performance play vital influence.Currently, power battery is not achieved for energy density in the performance for being limited to material of main part
With the requirement of course continuation mileage, many subdivision fields all propose more urgent want to the high rate performance of battery and rapid charge characteristic
It asks.
Current existing negative electrode material system dynamic performance is poor, and charging rate is slower, and removal lithium embedded speed is slower, Wu Faman
Requirement of the sufficient battery core product for the charging time, reason for that, significant portion are the coat electric properties on cathode pole piece
Caused by.
Summary of the invention
In view of this, this slurry applies the present invention provides a kind of slurry and preparation method, cathode pole piece, lithium ion battery
It overlays on negative electrode metallic foil on piece and forms cathode pole piece, there is very fast charging speed with the lithium ion battery that the cathode pole piece assembles
Degree.
A kind of slurry, the slurry include: by mass fraction
Slurry 46-54%
Water 46-54%；
The slurry includes: by mass fraction
Preferably, the aluminium hydroxide coated graphite uses hydrothermal synthesis method, preparation cladding by graphite and aluminum salt solution
Then graphite is cleaned repeatedly with pure water, until filtrate is in neutrality, then obtain aluminium hydroxide coated graphite through microwave drying.
Preferably, the D50 of the graphite cathode be 6-15 μm, specific surface area 0.8-1.6m2/g, tap density be greater than
Equal to 0.6g/cm3；The aluminum salt solution is one of aluminium chloride, aluminum sulfate, aluminum nitrate, alumina silicate and aluminium sulfide or more
Kind；The aluminium hydroxide covering amount of the aluminium hydroxide coated graphite is the 1-5wt% of graphite levels.
Preferably, the conductive agent is carbon black, acetylene black, electrically conductive graphite, carbon nanotube, conductive Carbon fibe and graphene
One of or it is a variety of.
Preferably, the thickener is sodium carboxymethylcellulose.
Preferably, the binder is SBR emulsion, styrene-acrylic emulsion, polyacrylic acid and polyacrylonitrile multi-component copolymer
One of object lotion.
A kind of preparation method of slurry, method include:
Aluminium hydroxide coated graphite, conductive agent, thickener and binder are added into water, mixing speed 2500-
4000r/min stirs 200-280min.
A kind of cathode pole piece, including copper foil and above-mentioned slurry, the slurry is coated on copper foil.
Preferably, the copper thickness is 8-12 μm.
A kind of lithium ion battery, including tertiary cathode piece, diaphragm, electrolyte and above-mentioned cathode pole piece, cathode is excessive
For 1.15-1.2.
The present invention provides a kind of slurry and preparation method, cathode pole piece, lithium ion battery, this slurry is coated in cathode gold
Belong to and form cathode pole piece on paillon, there is very fast charging rate with the lithium ion battery that the cathode pole piece assembles；Slurry changes
The wellability of pole piece and electrolyte interface has been apt to it, has improved the liquid-keeping property of interface, has increased interface imbibition effect, improve
The interfacial reaction impedance of lithium ion reduces charging polarization to effectively improve the embedding lithium kinetic characteristics of graphite material；Separately
Outside, due to the reduction of impedance, low temperature charging performance, the high rate performance of battery core are correspondingly optimized, especially in lithium-ion electric
Have on pond quick charge capability and shortening charging time etc. and is significantly promoted.
Specific embodiment
Below in conjunction with the embodiment of the present invention, technical scheme in the embodiment of the invention is clearly and completely described,
Obviously, described embodiments are some of the embodiments of the present invention, instead of all the embodiments.Based on the implementation in the present invention
Example, every other embodiment obtained by those of ordinary skill in the art without making creative efforts belong to
The scope of protection of the invention.
It should be appreciated that ought use in this specification and in the appended claims, term " includes " and "comprising" instruction
Described feature, entirety, step, operation, the presence of element and/or component, but one or more of the other feature, whole is not precluded
Body, step, operation, the presence or addition of element, component and/or its set.
It will be further appreciated that the term "and/or" used in description of the invention and the appended claims is
Refer to any combination and all possible combinations of one or more of associated item listed, and including these combinations.
A kind of slurry, slurry include: by mass fraction
Slurry 46-54%
Water 46-54%；
The slurry includes: by mass fraction
Wherein, aluminium hydroxide coated graphite uses hydrothermal synthesis method by graphite and aluminum salt solution, prepares coated graphite, so
It is cleaned repeatedly with pure water afterwards, until filtrate is in neutrality, then obtains aluminium hydroxide coated graphite through microwave drying.Wherein, graphite is
Artificial graphite coats soft carbon and has primary particle, and the D50 of graphite is 6-15 μm, specific surface area 0.8-1.6m2/ g, vibration
Real density is more than or equal to 0.6g/cm3；Aluminum salt solution is in aluminium chloride, aluminum sulfate, aluminum nitrate, alumina silicate and aluminium sulfide
It is one or more；The aluminium hydroxide covering amount of aluminium hydroxide coated graphite is the 1-5wt% of graphite levels.
Conductive agent is using carbon black, acetylene black, electrically conductive graphite, carbon nanotube, conductive one of Carbon fibe and graphene
Or it is a variety of；Thickener uses sodium carboxymethylcellulose；Binder using SBR emulsion, styrene-acrylic emulsion, polyacrylic acid and
One of polyacrylonitrile multi-copolymer emulsion.
A kind of preparation method of slurry, method include:
Aluminium hydroxide coated graphite, conductive agent, thickener and binder are added into water, mixing speed 2500-
4000r/min stirs 200-280min, slurry can be obtained.
Above-mentioned slurry is coated on copper foil including copper foil and above-mentioned slurry by a kind of cathode pole piece, through dry
To cathode pole piece；Then also roll-in can be carried out to cathode pole piece, cross cutting obtains assembling cathode pole piece；Generally, selection
Copper thickness is 8-12 μm.
A kind of lithium ion battery, including tertiary cathode piece, diaphragm, electrolyte and above-mentioned cathode pole piece, cathode is excessive
For 1.15-1.2.Wherein, tertiary cathode piece be common nickel-cobalt lithium manganate material (ratio of nickel-cobalt-manganese ternary element can be 1:1:
1,4:2:4,5:2:3,6:2:2 and 8:1:1 etc.), D50 is 4-12 μm.
Specific embodiment 1
A kind of slurry, slurry include: by mass fraction
Slurry 46%
Water 54%；
The slurry includes: by mass fraction
Wherein, aluminium hydroxide coated graphite passes through graphite and Al2(SO4)3Solution uses hydrothermal synthesis method, preparation cladding stone
Then ink is cleaned repeatedly with pure water, until filtrate is in neutrality, then obtain aluminium hydroxide coated graphite through microwave drying.Wherein, stone
The D50 of ink is 8 μm, specific surface area 1.6m2/ g, tap density 1g/cm3；The aluminium hydroxide of aluminium hydroxide coated graphite coats
Amount is the 1.3wt% of graphite levels.
A kind of preparation method of slurry, method include:
Aluminium hydroxide coated graphite, acetylene black, sodium carboxymethylcellulose and polyacrylic acid are added into water, stirring speed
Degree is 4000r/min, stirs 200min, slurry can be obtained.
Above-mentioned slurry is coated on copper foil including copper foil and above-mentioned slurry by a kind of cathode pole piece, through dry
To cathode pole piece；Then also roll-in can be carried out to cathode pole piece, cross cutting obtains assembling cathode pole piece；Generally, selection
Copper thickness is 8 μm.
A kind of lithium ion battery, including tertiary cathode piece, diaphragm, electrolyte and above-mentioned cathode pole piece, cathode is excessive
It is 1.15.Wherein, tertiary cathode piece is common nickel-cobalt lithium manganate material (ratio of nickel-cobalt-manganese ternary element is 1:1:1), and D50 is
5μm。
Specific embodiment 2
A kind of slurry, slurry include: by mass fraction
Slurry 52%
Water 48%；
The slurry includes: by mass fraction
Wherein, aluminium hydroxide coated graphite passes through graphite and Al (NO3)3Solution uses hydrothermal synthesis method, preparation cladding stone
Then ink is cleaned repeatedly with pure water, until filtrate is in neutrality, then obtain aluminium hydroxide coated graphite through microwave drying.Wherein, stone
The D50 of ink is 7 μm, specific surface area 1.4m2/ g, tap density 0.88g/cm3；The aluminium hydroxide of aluminium hydroxide coated graphite
Covering amount is the 1.5wt% of graphite levels.
A kind of preparation method of slurry, method include:
Aluminium hydroxide coated graphite, carbon black, sodium carboxymethylcellulose and styrene-acrylic emulsion are added into water, mixing speed
For 3600r/min, 220min is stirred, slurry can be obtained.
Above-mentioned slurry is coated on copper foil including copper foil and above-mentioned slurry by a kind of cathode pole piece, through dry
To cathode pole piece；Then also roll-in can be carried out to cathode pole piece, cross cutting obtains assembling cathode pole piece；Generally, selection
Copper thickness is 10 μm.
A kind of lithium ion battery, including tertiary cathode piece, diaphragm, electrolyte and above-mentioned cathode pole piece, cathode is excessive
It is 1.2.Wherein, tertiary cathode piece is common nickel-cobalt lithium manganate material (ratio of nickel-cobalt-manganese ternary element is 5:2:3), D50 6
μm。
Specific embodiment 3
A kind of slurry, slurry include: by mass fraction
Slurry 54%
Water 46%；
The slurry includes: by mass fraction
Wherein, aluminium hydroxide coated graphite passes through graphite and AlCl3Solution uses hydrothermal synthesis method, prepares coated graphite,
Then it is cleaned repeatedly with pure water, until filtrate is in neutrality, then obtains aluminium hydroxide coated graphite through microwave drying.Wherein, graphite
D50 be 7 μm, specific surface area 1.4m2/ g, tap density 0.88g/cm3；The aluminium hydroxide packet of aluminium hydroxide coated graphite
The amount of covering is the 2wt% of graphite levels.
A kind of preparation method of slurry, method include:
Aluminium hydroxide coated graphite, acetylene black, sodium carboxymethylcellulose and polyacrylonitrile multi-copolymer emulsion are added
Enter into water, mixing speed 2500r/min, stirs 280min, slurry can be obtained.
Above-mentioned slurry is coated on copper foil including copper foil and above-mentioned slurry by a kind of cathode pole piece, through dry
To cathode pole piece；Then also roll-in can be carried out to cathode pole piece, cross cutting obtains assembling cathode pole piece；Generally, selection
Copper thickness is 8 μm.
A kind of lithium ion battery, including tertiary cathode piece, diaphragm, electrolyte and above-mentioned cathode pole piece, cathode is excessive
It is 1.18.Wherein, tertiary cathode piece is common nickel-cobalt lithium manganate material (ratio of nickel-cobalt-manganese ternary element is 4:2:4), and D50 is
8μm。
Specific embodiment 4
A kind of slurry, slurry include: by mass fraction
Slurry 48%
Water 52%；
The slurry includes: by mass fraction
Wherein, aluminium hydroxide coated graphite uses hydrothermal synthesis method by graphite and aluminum fluosilicate solution, prepares coated graphite,
Then it is cleaned repeatedly with pure water, until filtrate is in neutrality, then obtains aluminium hydroxide coated graphite through microwave drying.Wherein, graphite
D50 be 13 μm, specific surface area 1m2/ g, tap density 0.9g/cm3；The aluminium hydroxide of aluminium hydroxide coated graphite coats
Amount is the 4wt% of graphite levels.
A kind of preparation method of slurry, method include:
By aluminium hydroxide coated graphite, carbon nanotube, conductive Carbon fibe, sodium carboxymethylcellulose and SBR emulsion
It is added into water, mixing speed 2800r/min, stirs 260min, slurry can be obtained.
Above-mentioned slurry is coated on copper foil including copper foil and above-mentioned slurry by a kind of cathode pole piece, through dry
To cathode pole piece；Then also roll-in can be carried out to cathode pole piece, cross cutting obtains assembling cathode pole piece；Generally, selection
Copper thickness is 11 μm.
A kind of lithium ion battery, including tertiary cathode piece, diaphragm, electrolyte and above-mentioned cathode pole piece, cathode is excessive
It is 1.16.Wherein, tertiary cathode piece is common nickel-cobalt lithium manganate material (ratio of nickel-cobalt-manganese ternary element is 6:2:2), and D50 is
12μm。
Specific embodiment 5
A kind of slurry, slurry include: by mass fraction
Slurry 49%
Water 51%；
The slurry includes: by mass fraction
Wherein, aluminium hydroxide coated graphite uses hydrothermal synthesis method by graphite and vulcanization aluminum solutions, prepares coated graphite,
Then it is cleaned repeatedly with pure water, until filtrate is in neutrality, then obtains aluminium hydroxide coated graphite through microwave drying.Wherein, graphite
D50 be 15 μm, specific surface area 1.6m2/ g, tap density 0.9g/cm3；The aluminium hydroxide packet of aluminium hydroxide coated graphite
The amount of covering is the 5wt% of graphite levels.
A kind of preparation method of slurry, method include:
Aluminium hydroxide coated graphite, graphene, thickener and styrene-acrylic emulsion are added into water, mixing speed is
3200r/min stirs 240min, slurry can be obtained.
Above-mentioned slurry is coated on copper foil including copper foil and above-mentioned slurry by a kind of cathode pole piece, through dry
To cathode pole piece；Then also roll-in can be carried out to cathode pole piece, cross cutting obtains assembling cathode pole piece；Generally, selection
Copper thickness is 12 μm.
A kind of lithium ion battery, including tertiary cathode piece, diaphragm, electrolyte and above-mentioned cathode pole piece, cathode is excessive
It is 1.17.Wherein, tertiary cathode piece is common nickel-cobalt lithium manganate material (ratio of nickel-cobalt-manganese ternary element is 8:1:1), and D50 is
12μm。
By slurry made from embodiment 1-5, and cathode pole piece is made according to the above method, and thus cathode pole piece obtains
Lithium ion battery；The slurry formed with existing graphite of the use without aluminium hydroxide, and cathode is made by above-mentioned same method
Pole piece, and the lithium ion battery that thus cathode pole piece obtains carry out performance comparison, as comparative example 1.Wherein, in 2C fast charge
On, constant current is carried out than test, charging time test (time for being charged to 90%) and charging analysis lithium test at low temperature, test
As a result as follows:
| Group | Constant current ratio (%) | Charging time (min) | It analyses lithium situation (- 20 DEG C) |
| Specific embodiment 1 | 80 | 25 | Do not analyse lithium |
| Specific embodiment 2 | 82 | 23 | Do not analyse lithium |
| Specific embodiment 3 | 85 | 20 | Do not analyse lithium |
| Specific embodiment 4 | 84 | 22 | Do not analyse lithium |
| Specific embodiment 5 | 87 | 18 | Do not analyse lithium |
| Comparative example 1 | 75 | 30 | Analyse lithium |
As seen from the above table, the lithium ion battery of embodiment 1-5 is more larger than above having in crossing current compared to existing lithium ion battery
The raising of amplitude, maximum can achieve 87%, and the charging time greatlys save, and can at most save 12min, and under -20 DEG C of environment,
Lithium precipitation is not had.
The steps in the embodiment of the present invention can be sequentially adjusted, merged and deleted according to actual needs.
It is described in detail herein, applies specific case and the principle of the present invention and embodiment are explained
It states, above embodiments are merely used to help understand method and its core concept of the invention；Meanwhile for the general skill of this field
Art personnel, according to the thought of the present invention, there will be changes in the specific implementation manner and application range, in conclusion this
Description should not be construed as limiting the invention.
It is apparent to those skilled in the art that for convenience and simplicity of description, the system of foregoing description
It with the specific work process of unit, can refer to corresponding processes in the foregoing method embodiment, details are not described herein.
Claims (10)
1. a kind of slurry, which is characterized in that the slurry includes: by mass fraction
Slurry 46-54%
Water 46-54%；
The slurry includes: by mass fraction
2. slurry according to claim 1, it is characterised in that: the aluminium hydroxide coated graphite is molten by graphite and aluminium salt
Liquid uses hydrothermal synthesis method, prepares coated graphite, is then cleaned repeatedly with pure water, until filtrate is in neutrality, then through microwave drying
Obtain aluminium hydroxide coated graphite.
3. slurry according to claim 2, it is characterised in that: the D50 of the graphite is 6-15 μm, specific surface area 0.8-
1.6m2/ g, tap density are more than or equal to 0.6g/cm3；The aluminum salt solution be aluminium chloride, aluminum sulfate, aluminum nitrate, alumina silicate with
And one of aluminium sulfide or a variety of；The aluminium hydroxide covering amount of the aluminium hydroxide coated graphite is the 1- of graphite levels
5wt%.
4. slurry according to claim 1, it is characterised in that: the conductive agent is carbon black, acetylene black, electrically conductive graphite, carbon
Nanotube, conductive one of Carbon fibe and graphene or a variety of.
5. slurry according to claim 1, it is characterised in that: the thickener is sodium carboxymethylcellulose.
6. slurry according to claim 1, it is characterised in that: the binder is SBR emulsion, styrene-acrylic emulsion, gathers
One of acrylic acid and polyacrylonitrile multi-copolymer emulsion.
7. a kind of preparation method of slurry, which is characterized in that method includes:
Aluminium hydroxide coated graphite, conductive agent, thickener and binder are added into water, mixing speed 2500-
4000r/min stirs 200-280min.
8. a kind of cathode pole piece, it is characterised in that: including copper foil and slurry as claimed in claim 1 to 7, the slurry
Coated on copper foil.
9. cathode pole piece according to claim 8, it is characterised in that: the copper thickness is 8-12 μm.
10. a kind of lithium ion battery, which is characterized in that including tertiary cathode piece, diaphragm, electrolyte and any institute of right 8-9
The cathode pole piece stated, cathode are excessively 1.15-1.2.
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