CN117477037B - Sodium ion battery and electric equipment - Google Patents
Sodium ion battery and electric equipment Download PDFInfo
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- CN117477037B CN117477037B CN202311813714.XA CN202311813714A CN117477037B CN 117477037 B CN117477037 B CN 117477037B CN 202311813714 A CN202311813714 A CN 202311813714A CN 117477037 B CN117477037 B CN 117477037B
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- Prior art keywords
- ion battery
- sodium ion
- sodium
- solvent
- active material
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- 229910001415 sodium ion Inorganic materials 0.000 title claims abstract description 64
- FKNQFGJONOIPTF-UHFFFAOYSA-N Sodium cation Chemical compound [Na+] FKNQFGJONOIPTF-UHFFFAOYSA-N 0.000 title claims abstract description 63
- 239000002904 solvent Substances 0.000 claims abstract description 47
- 239000003792 electrolyte Substances 0.000 claims abstract description 28
- 239000011149 active material Substances 0.000 claims abstract description 20
- 239000011230 binding agent Substances 0.000 claims abstract description 17
- 239000006258 conductive agent Substances 0.000 claims abstract description 17
- 159000000000 sodium salts Chemical class 0.000 claims abstract description 17
- 239000007774 positive electrode material Substances 0.000 claims abstract description 10
- JBTWLSYIZRCDFO-UHFFFAOYSA-N ethyl methyl carbonate Chemical compound CCOC(=O)OC JBTWLSYIZRCDFO-UHFFFAOYSA-N 0.000 claims description 29
- -1 polytetrafluoroethylene Polymers 0.000 claims description 17
- 239000011734 sodium Substances 0.000 claims description 16
- 229910052708 sodium Inorganic materials 0.000 claims description 15
- 125000004122 cyclic group Chemical group 0.000 claims description 14
- 230000014759 maintenance of location Effects 0.000 claims description 13
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 12
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 12
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 claims description 9
- 239000002033 PVDF binder Substances 0.000 claims description 8
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 8
- YEJRWHAVMIAJKC-UHFFFAOYSA-N 4-Butyrolactone Chemical compound O=C1CCCO1 YEJRWHAVMIAJKC-UHFFFAOYSA-N 0.000 claims description 6
- OIFBSDVPJOWBCH-UHFFFAOYSA-N Diethyl carbonate Chemical compound CCOC(=O)OCC OIFBSDVPJOWBCH-UHFFFAOYSA-N 0.000 claims description 6
- FKRCODPIKNYEAC-UHFFFAOYSA-N ethyl propionate Chemical compound CCOC(=O)CC FKRCODPIKNYEAC-UHFFFAOYSA-N 0.000 claims description 6
- RUOJZAUFBMNUDX-UHFFFAOYSA-N propylene carbonate Chemical compound CC1COC(=O)O1 RUOJZAUFBMNUDX-UHFFFAOYSA-N 0.000 claims description 6
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 5
- 229920003048 styrene butadiene rubber Polymers 0.000 claims description 5
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 claims description 4
- 229920003171 Poly (ethylene oxide) Polymers 0.000 claims description 4
- 229910021393 carbon nanotube Inorganic materials 0.000 claims description 4
- 239000002041 carbon nanotube Substances 0.000 claims description 4
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 4
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 4
- HFZLSTDPRQSZCQ-UHFFFAOYSA-N 1-pyrrolidin-3-ylpyrrolidine Chemical compound C1CCCN1C1CNCC1 HFZLSTDPRQSZCQ-UHFFFAOYSA-N 0.000 claims description 3
- UHOPWFKONJYLCF-UHFFFAOYSA-N 2-(2-sulfanylethyl)isoindole-1,3-dione Chemical compound C1=CC=C2C(=O)N(CCS)C(=O)C2=C1 UHOPWFKONJYLCF-UHFFFAOYSA-N 0.000 claims description 3
- FHVDTGUDJYJELY-UHFFFAOYSA-N 6-{[2-carboxy-4,5-dihydroxy-6-(phosphanyloxy)oxan-3-yl]oxy}-4,5-dihydroxy-3-phosphanyloxane-2-carboxylic acid Chemical compound O1C(C(O)=O)C(P)C(O)C(O)C1OC1C(C(O)=O)OC(OP)C(O)C1O FHVDTGUDJYJELY-UHFFFAOYSA-N 0.000 claims description 3
- RJUFJBKOKNCXHH-UHFFFAOYSA-N Methyl propionate Chemical compound CCC(=O)OC RJUFJBKOKNCXHH-UHFFFAOYSA-N 0.000 claims description 3
- 229920002125 Sokalan® Polymers 0.000 claims description 3
- 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 3
- 229940072056 alginate Drugs 0.000 claims description 3
- 229920000615 alginic acid Polymers 0.000 claims description 3
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 claims description 3
- 229940093499 ethyl acetate Drugs 0.000 claims description 3
- 229910021389 graphene Inorganic materials 0.000 claims description 3
- 229910002804 graphite Inorganic materials 0.000 claims description 3
- 239000010439 graphite Substances 0.000 claims description 3
- 229940017219 methyl propionate Drugs 0.000 claims description 3
- YKYONYBAUNKHLG-UHFFFAOYSA-N n-Propyl acetate Natural products CCCOC(C)=O YKYONYBAUNKHLG-UHFFFAOYSA-N 0.000 claims description 3
- 229940090181 propyl acetate Drugs 0.000 claims description 3
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims description 3
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims description 3
- BAZAXWOYCMUHIX-UHFFFAOYSA-M sodium perchlorate Chemical compound [Na+].[O-]Cl(=O)(=O)=O BAZAXWOYCMUHIX-UHFFFAOYSA-M 0.000 claims description 3
- 229910001488 sodium perchlorate Inorganic materials 0.000 claims description 3
- 229910001495 sodium tetrafluoroborate Inorganic materials 0.000 claims description 3
- NQPDZGIKBAWPEJ-UHFFFAOYSA-N valeric acid Chemical compound CCCCC(O)=O NQPDZGIKBAWPEJ-UHFFFAOYSA-N 0.000 claims description 3
- 239000004584 polyacrylic acid Substances 0.000 claims description 2
- 239000000661 sodium alginate Substances 0.000 claims description 2
- 235000010413 sodium alginate Nutrition 0.000 claims description 2
- 239000000654 additive Substances 0.000 description 10
- 230000000996 additive effect Effects 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 9
- 239000007789 gas Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 7
- 239000006259 organic additive Substances 0.000 description 7
- 238000002360 preparation method Methods 0.000 description 7
- 238000001556 precipitation Methods 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- VAYTZRYEBVHVLE-UHFFFAOYSA-N 1,3-dioxol-2-one Chemical compound O=C1OC=CO1 VAYTZRYEBVHVLE-UHFFFAOYSA-N 0.000 description 5
- SBLRHMKNNHXPHG-UHFFFAOYSA-N 4-fluoro-1,3-dioxolan-2-one Chemical compound FC1COC(=O)O1 SBLRHMKNNHXPHG-UHFFFAOYSA-N 0.000 description 5
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 4
- 239000005977 Ethylene Substances 0.000 description 4
- 239000011267 electrode slurry Substances 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- FSSPGSAQUIYDCN-UHFFFAOYSA-N 1,3-Propane sultone Chemical compound O=S1(=O)CCCO1 FSSPGSAQUIYDCN-UHFFFAOYSA-N 0.000 description 2
- GWAOOGWHPITOEY-UHFFFAOYSA-N 1,5,2,4-dioxadithiane 2,2,4,4-tetraoxide Chemical compound O=S1(=O)CS(=O)(=O)OCO1 GWAOOGWHPITOEY-UHFFFAOYSA-N 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 2
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 2
- 229910019142 PO4 Inorganic materials 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000002174 Styrene-butadiene Substances 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 239000006230 acetylene black Substances 0.000 description 2
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 2
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 239000011888 foil Substances 0.000 description 2
- 239000003273 ketjen black Substances 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 239000010452 phosphate Substances 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- ZPFAVCIQZKRBGF-UHFFFAOYSA-N 1,3,2-dioxathiolane 2,2-dioxide Chemical compound O=S1(=O)OCCO1 ZPFAVCIQZKRBGF-UHFFFAOYSA-N 0.000 description 1
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 1
- OQXNUCOGMMHHNA-UHFFFAOYSA-N 4-methyl-1,3,2-dioxathiolane 2,2-dioxide Chemical compound CC1COS(=O)(=O)O1 OQXNUCOGMMHHNA-UHFFFAOYSA-N 0.000 description 1
- NEILRVQRJBVMSK-UHFFFAOYSA-N B(O)(O)O.C[SiH](C)C.C[SiH](C)C.C[SiH](C)C Chemical compound B(O)(O)O.C[SiH](C)C.C[SiH](C)C.C[SiH](C)C NEILRVQRJBVMSK-UHFFFAOYSA-N 0.000 description 1
- JJFDUEREVQNQCH-UHFFFAOYSA-N B([O-])([O-])[O-].[Na+].C(C(=O)F)(=O)F.[Na+].[Na+] Chemical compound B([O-])([O-])[O-].[Na+].C(C(=O)F)(=O)F.[Na+].[Na+] JJFDUEREVQNQCH-UHFFFAOYSA-N 0.000 description 1
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 229910018434 Mn0.5O2 Inorganic materials 0.000 description 1
- XNENYPKLNXFICU-UHFFFAOYSA-N P(O)(O)O.C[SiH](C)C.C[SiH](C)C.C[SiH](C)C Chemical compound P(O)(O)O.C[SiH](C)C.C[SiH](C)C.C[SiH](C)C XNENYPKLNXFICU-UHFFFAOYSA-N 0.000 description 1
- 235000010443 alginic acid Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000001351 cycling effect Effects 0.000 description 1
- 238000000840 electrochemical analysis Methods 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 229910021385 hard carbon Inorganic materials 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- ZRZFJYHYRSRUQV-UHFFFAOYSA-N phosphoric acid trimethylsilane Chemical compound C[SiH](C)C.C[SiH](C)C.C[SiH](C)C.OP(O)(O)=O ZRZFJYHYRSRUQV-UHFFFAOYSA-N 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 229920000447 polyanionic polymer Polymers 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- KBVUALKOHTZCGR-UHFFFAOYSA-M sodium;difluorophosphinate Chemical compound [Na+].[O-]P(F)(F)=O KBVUALKOHTZCGR-UHFFFAOYSA-M 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 238000004804 winding 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
- H01M10/056—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
- H01M10/0568—Liquid materials characterised by the solutes
-
- 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
- H01M10/054—Accumulators with insertion or intercalation of metals other than lithium, e.g. with magnesium or aluminium
-
- 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
- H01M10/0569—Liquid materials characterised by the solvents
-
- 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
- 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
- H01M4/621—Binders
- H01M4/622—Binders being polymers
-
- 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
- H01M4/621—Binders
- H01M4/622—Binders being polymers
- H01M4/623—Binders being polymers fluorinated polymers
-
- 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
-
- 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 invention relates to the technical field of sodium ion batteries, in particular to a sodium ion battery and electric equipment. The sodium ion battery comprises a positive pole piece and electrolyte; the positive electrode plate comprises an active material layer, wherein the active material layer mainly comprises a positive electrode active material, a conductive agent and a binder; the conductive agent accounts for the total mass of the active material layer in percentage A, and the binder accounts for the total mass of the active material layer in percentage B; the electrolyte comprises a solvent and sodium salt; the relative dielectric constant of the solvent is epsilon, the solvent comprises n types, n is more than or equal to 2, and the mass ratio of each solvent to the total mass of the solvent is M; the molar concentration of sodium salt in the electrolyte is N; A. b, ε, M and N satisfy: a/b+c is 4.3.ltoreq.a.ltoreq.12.9, and c=
Description
Technical Field
The invention relates to the technical field of sodium ion batteries, in particular to a sodium ion battery and electric equipment.
Background
Compared with a lithium ion battery, the sodium ion battery with higher resource abundance is hopeful to be used as a role of a lithium ion battery supplement to step into commercialization, and fills market space in the fields of A00-level power, energy storage and the like. The sodium ion battery is required to have certain safety performance in the above target application scene, so that the normal use of the battery in the whole life process is ensured and no fire disaster occurs.
However, the current high energy density sodium ion battery electrolyte formulation is not flame retardant and is relatively poor in performance against severe test standards such as needling, thermal runaway heating and the like. Has certain potential safety hazard in the actual use process.
Therefore, it is important to provide a sodium ion battery with high safety.
In view of this, the present invention has been made.
Disclosure of Invention
The first object of the present invention is to provide a sodium ion battery, which can inhibit the battery safety problem caused by faraday reaction, oxygen release and other factors at high temperature of the positive electrode by adjusting and controlling the parameters of sodium salt dosage, relative dielectric constant and dosage of solvent, conductive agent dosage and binder dosage in the positive electrode sheet, etc., and reduce the energy release intensity caused by internal micro short circuit when the battery fails, and better inhibit jet fire, thereby preventing the occurrence of fire disaster and having high safety.
A second object of the present invention is to provide a powered device.
In order to achieve the above object of the present invention, the following technical solutions are specifically adopted:
the invention firstly provides a sodium ion battery, which comprises a positive pole piece and electrolyte;
the positive electrode plate comprises an active material layer, wherein the active material layer mainly comprises a positive electrode active material, a conductive agent and a binder; the mass of the conductive agent is A, and the mass of the binder is B;
The electrolyte comprises a solvent and sodium salt; the relative dielectric constant of the solvent is epsilon, the solvent comprises n types, wherein n is more than or equal to 2, and the mass ratio of each solvent to the total mass of the solvent is M; the molar concentration of the sodium salt in the electrolyte is N;
the A, the B, the epsilon, the M and the N satisfy the following relation:
A/b+c is 4.3.ltoreq.a.ltoreq.12.9, and c= 。
Further, the A is 0.6% -3%.
Further, the B is 1.0% -3.1%.
Further, the C is 4.1-10.9.
Further, epsilon is 2-100.
Further, M is 0-1.
Further, the N is 0.1-1.5 mol/L.
Further, the conductive agent includes at least one of conductive carbon black, conductive graphite, carbon nanotubes, and graphene;
Further, the binder includes at least one of polyvinylidene fluoride, polytetrafluoroethylene, polyacrylic acid, styrene-butadiene rubber, polyethylene oxide, sodium carboxymethyl cellulose, and alginate.
Further, the solvent includes at least one of a cyclic ester solvent and a chain ester solvent.
Further, the solvent comprises the following components in percentage by mass: (100-x) a cyclic ester solvent and a chain ester solvent, wherein x=10 to 90.
Further, the cyclic ester solvent includes at least one of ethylene carbonate, propylene carbonate, and gamma-butyrolactone;
further, the chain ester solvent includes at least one of dimethyl carbonate, diethyl carbonate, methylethyl carbonate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, and butyl propionate.
Further, the sodium salt includes at least one of sodium hexafluorophosphate, sodium tetrafluoroborate, sodium perchlorate, sodium bis-fluorosulfonyl imide, and sodium bis-trifluoromethanesulfonyl imide.
Further, the gas yield of the sodium ion battery is less than or equal to 20mL/Ah after 500 weeks of circulation at 45 ℃.
Further, the capacity retention rate of the sodium ion battery is more than or equal to 75% after 500 weeks of circulation at 45 ℃.
Further, the impedance increase rate of the sodium ion battery is less than or equal to 70% after 500 weeks of circulation at 45 ℃.
The invention further provides electric equipment, which comprises the sodium ion battery.
Compared with the prior art, the invention has the beneficial effects that:
(1) The sodium ion battery provided by the invention can inhibit the safety problem of the battery caused by factors such as Faraday reaction, oxygen release and the like at the high temperature of the anode, reduce the energy release intensity caused by internal micro-short circuit when the battery is invalid, better inhibit jet fire, prevent the occurrence of fire, and has high safety, and the sodium ion battery has better circulation stability and reversible capacity.
(2) The sodium ion battery provided by the invention has high capacity retention rate and low impedance growth rate.
(3) The sodium ion battery provided by the invention is not easy to generate phenomena of sodium precipitation and mass gas production.
Detailed Description
The technical solution of the present invention will be clearly and completely described in conjunction with the specific embodiments, but it will be understood by those skilled in the art that the examples described below are some, but not all, examples of the present invention, and are intended to be illustrative only and should not be construed as limiting the scope of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention. The specific conditions are not noted in the examples and are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention.
In the present invention, unless specifically stated otherwise, the terms "first", "second", "third", "fourth", etc. are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or quantity or as implicitly indicating the importance or quantity of the indicated technical feature. Moreover, the terms "first," "second," "third," "fourth," and the like are used for non-exhaustive list description purposes only, and are not to be construed as limiting the number of closed forms.
The terms "comprising" and "including" as used herein mean open ended or closed ended, unless otherwise noted. For example, the terms "comprising" and "comprises" may mean that other components not listed may be included or included, or that only listed components may be included or included.
In the present invention, "one or more" or "at least one" means any one, any two or more of the listed items unless specifically stated otherwise. Wherein "several" means any two or more.
In a first aspect, the invention provides a sodium ion battery with high safety and stability, which comprises a positive electrode plate and electrolyte.
The positive electrode plate comprises an active material layer, wherein the active material layer mainly comprises a positive electrode active material, a conductive agent and a binder. The mass of the conductive agent is a percentage of the total mass of the active material layer, i.e., a=the mass of the conductive agent/the total mass of the active material layer×100%. The mass of the binder is B, i.e. b=binder mass/active material layer total mass x 100%, as a percentage of the active material layer total mass.
The electrolyte includes a solvent and a sodium salt. The relative dielectric constant of the solvent is epsilon, the solvent comprises n types, wherein n is more than or equal to 2, and the mass ratio of each solvent to the total mass of the solvent is M, namely M=the mass of one solvent/the total mass of the solvent. The molar concentration of the sodium salt in the electrolyte is N.
The A, the B, the epsilon, the M and the N satisfy the following relation:
A/b+c is 4.3.ltoreq.a.ltoreq.12.9, and c= 。
The constraint values in the above-mentioned relational expressions are parameters that affect ion conductivity and electron conductivity in the battery, and by adjusting the parameters, the performance of the battery can be improved.
Wherein ε has no units. N is in mol/L. A is expressed in%. The unit of B is percent.
Wherein the value of A/B+C is 4.3-12.9, including but not limited to any one of the point values or any range between the two values of 4.3、4.5、4.8、5.0、5.3、5.5、5.8、6.0、6.2、6.5、6.7、7.0、7.3、7.5、7.8、8.0、8.2、8.4、8.6、7、7.5、8、8.5、9、10、11、12、12.9.
It is understood that n in the above relation is the number of solvent species. For example, if 2 solvents are included in the electrolyte, then n=2; if 3 solvents are included in the electrolyte, n=3.
It will be appreciated that when 3 solvents are included in the electrolyte, the relative permittivity of the first solvent is ε 1, the relative permittivity of the second solvent is ε 2, the relative permittivity of the third solvent is ε 3, the mass of the first solvent is M 1, the mass of the second solvent is M 2, and the mass of the third solvent is M 3. At this point c=epsilon 1M1/4+ε2M2/4+ε3M3/4+n.
According to the sodium ion battery provided by the invention, the dosage of the sodium salt in the electrolyte, the relative dielectric constant of the solvent and the dosage thereof are controlled, and the dosage of the conductive agent and the dosage of the binder in the positive electrode sheet are regulated and controlled to perform multi-angle combined action, so that the battery safety problem caused by factors such as Faraday reaction, oxygen release and the like at the high temperature of the positive electrode can be inhibited, the energy release intensity of internal micro-short circuit when the battery is invalid is reduced, the generation of jet fire is well inhibited, the occurrence of fire is further prevented, and the secondary battery has good safety performance in the actual use process.
Meanwhile, the electrical properties such as the circulation stability, the storage stability and the like of the sodium ion battery under a steady state are not affected, and the sodium ion battery has good capacity retention rate and lower impedance growth rate in the use process, and does not generate phenomena of sodium evolution and mass gas production.
And the sodium ion battery provided by the invention is compatible with the existing sodium ion battery production process, and the production cost is lower.
In order to further comprehensively consider the cycle performance and the impedance growth rate of the sodium ion battery and avoid the phenomena of sodium precipitation, gas production and the like, parameters such as A, B, C, epsilon, M, N and the like are optimized.
In some specific embodiments, the A is 0.6% -3%; including but not limited to any one of a point value or a range value between any two of 0.6%, 0.7%, 0.8%, 0.9%, 1.0%, 1.2%, 1.4%, 1.5%, 1.6%, 2%, 2.3%, 2.5%, 2.8%, 3%.
In some specific embodiments, the A is 0.8% -1.2%.
In some specific embodiments, the B is 1.0% -3.1%; including but not limited to a point value of any one of 1.0%, 1.2%, 1.4%, 1.5%, 1.8%, 2.0%, 2.2%, 2.3%, 2.5%, 2.8%, 3%, 3.1%, or a range value between any two.
In some specific embodiments, the B is 1.3% -1.8%.
In some specific embodiments, the C is 4.1-10.9, including but not limited to a point value of any one of 4.1, 4.3, 4.5, 4.8, 5.0, 5.5, 6.0, 6.5, 7.0, 7.5, 7.9, 8, 8.3, 8.5, 9, 9.5, 10, 10.9 or a range value between any two.
In some specific embodiments, the C is 4.5 to 7.9.
In some specific embodiments, epsilon is 2-100; including but not limited to a point value of any one of 2, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100 or a range value therebetween.
In some specific embodiments, M is 0-1; including but not limited to a point value of any one of 0, 0.0001, 0.001, 0.01, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1 or a range value between any two.
In some specific embodiments, the N is 0.1-1.5 mol/L, including but not limited to a point value of any one of 0.1mol/L, 0.2mol/L, 0.3mol/L, 0.5mol/L, 0.6mol/L, 0.8mol/L, 1.0mol/L, 1.2mol/L, 1.4mol/L, 1.5mol/L, or a range value therebetween.
In some embodiments, the conductive agent includes at least one of conductive carbon black, conductive graphite, carbon nanotubes, and graphene.
In some embodiments, the conductive carbon black includes at least one of conductive carbon black SP (super p), acetylene Black (AB), and Ketjen Black (KB).
In some specific embodiments, the binder includes at least one of polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), polyacrylic acid (PAA), styrene-butadiene rubber (SBR), polyethylene oxide (PEO), sodium carboxymethyl cellulose (CMC), and alginate.
In some embodiments, the solvent comprises at least one of a cyclic ester solvent and a chain ester solvent.
Generally, the cyclic ester solvent has a high relative dielectric constant and a high viscosity.
The relative dielectric constant and viscosity of the chain ester solvent are low.
In some embodiments, in order to adjust the relative dielectric constant epsilon of the solvent and thereby control the C value, the solvent comprises the following components in mass ratio x: (100-x) a cyclic ester solvent and a chain ester solvent, wherein x=10 to 90.
As an example, the mass ratio of cyclic ester solvent to chain ester solvent is 10:90, 20:80, 30:70, 40:60, 50:50, 60:40, 70:30, 80:20, or 90:10.
The mass ratio of the cyclic ester solvent to the chain ester solvent is controlled within the range, so that the kinetic performance of the sodium ion battery in normal use is guaranteed, sodium precipitation is prevented, and the impedance performance is optimized. Meanwhile, the problem of battery gas production caused by excessive specific gravity of ethylene carbonate in the cyclic ester solvent in the solvent due to a singlet oxygen release mechanism can be avoided.
In some embodiments, the cyclic ester solvent includes at least one of ethylene carbonate, propylene carbonate, and gamma-butyrolactone.
In some specific embodiments, the chain ester solvent comprises at least one of dimethyl carbonate, diethyl carbonate, methylethyl carbonate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, and butyl propionate.
In some specific embodiments, the sodium salt comprises at least one of sodium hexafluorophosphate, sodium tetrafluoroborate, sodium perchlorate, sodium bis-fluorosulfonyl imide, and sodium bis-trifluoromethanesulfonyl imide.
In some specific embodiments, the sodium ion battery has a gas production rate of less than or equal to 20mL/Ah at 0.5C/1C at 45℃for 500 weeks, including, but not limited to, a point value of any one of 20mL/Ah, 15mL/Ah, 10mL/Ah, 5mL/Ah, 4mL/Ah, 3mL/Ah, 2mL/Ah, 1mL/Ah, 0.5mL/Ah, 0mL/Ah, or a range value between any two.
In some specific embodiments, the sodium ion battery has a capacity retention of greater than or equal to 75% at 0.5C/1C at 45 ℃ for 500 weeks, including but not limited to a point value of any one of 75%, 77%, 80%, 83%, 85%, 88%, 90%, 91%, 92%, 93%, 95%, or a range of values between any two.
In some specific embodiments, the sodium ion battery has an impedance increase rate of less than or equal to 70% at 0.5C/1C at 45 ℃ for 500 weeks, including, but not limited to, a point value of any one of, or a range of values between, 70%, 60%, 50%, 40%, 39%, 38%, 37%, 36%, 35%, 33%, 30%, 28%, 26%, 25%, 23%, 20%, 15%, 10%.
In some specific embodiments, the method for testing the capacity retention rate is: the above-mentioned battery was charged to 3.95V at a constant current and constant voltage of 0.5C at 45℃with a cutoff current of 0.05C, and then discharged to 2.0V at a constant current of 1C, respectively. The 500 th cycle capacity retention rate was calculated after 500 cycles of charge/discharge.
In some embodiments, the sodium ion battery further comprises a negative electrode tab.
In some embodiments, the sodium ion battery further comprises a separator.
In some embodiments, the electrolyte further comprises an organic additive and/or a salt-type additive.
Among them, the organic additives include any organic materials commonly used in the art.
As an example, the organic additive includes at least one of a carbonate additive, a silicon-containing additive, and a sulfur-containing additive; the carbonate additive includes at least one of Vinylene Carbonate (VC) and fluoroethylene carbonate (FEC); the silicon-containing additive includes at least one of tris (trimethylsilane) phosphite (TMSPi), tris (trimethylsilane) phosphate (TMSP), and tris (trimethylsilane) borate (TMSB); the sulfur-containing additive includes at least one of 1, 3-Propane Sultone (PS), 1, 3-Propane Sultone (PST), ethylene sulfate (DTD), propylene sulfate (PCS), methylene Methane Disulfonate (MMDS), ethylene 4-methylsulfate (MeDTD), ethylene 4-fluoro sulfate (FDTD) ester, ethylene 4,4' -disulfate (BiDTD), spirodi-DTD (1, 3,6, 8-tetraoxy-2, 7-disulfide-spiro [4.4] nonane-2, 7-tetraoxide), bis-DTD (GS), ethylene 4, 5-dimethyl sulfate (DMeDTD), and 1, 2-Cyclopentadienylsulfate (CPS), but is not limited thereto. The main components of the SEI film can be regulated and controlled by adopting the organic additives of the types, organic and inorganic components of SEI are reasonably distributed, and therefore, the lower impedance and higher cycling stability of the SEI main body are ensured.
As an example, the mass fraction of the organic additive in the electrolyte may be 0.1% -5%, for example 0.1%, 0.3%, 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5% or 5%, but is not limited thereto.
The salt-type additive includes any salt-type material commonly used in the art.
As an example, the salt type additive includes at least one of sodium difluorooxalate borate (NaDFOB), sodium difluorophosphate (NaDFP) and sodium difluorobis-oxalate phosphate (NaDFOP), but is not limited thereto.
As an example, the mass fraction of the salt type additive in the electrolyte may be 0.1% -2%, for example, 0.1%, 0.3%, 0.5%, 0.8%, 1%, 1.3%, 1.5%, 1.8% or 2%, but is not limited thereto.
In some embodiments, the positive electrode sheet includes a current collector, and the active material layer is disposed on the current collector. Wherein the active material layer is mainly composed of a positive electrode active material, a conductive agent and a binder.
Among them, the positive electrode active material includes any positive electrode material commonly used in the art.
As an example, the positive electrode material includes at least one of a layered metal oxide, a polyanion compound, a prussian compound, a phosphate compound, and a sulfate compound, but is not limited thereto.
In a second aspect, the invention provides an electric device, comprising the sodium ion battery.
The electric equipment comprises any equipment, device or system containing the sodium ion battery, such as vehicles, energy storage systems, electronic products, medical equipment, office equipment and the like, but is not limited to the equipment, the device or the system.
Embodiments of the present invention will be described in detail below with reference to examples, but it will be understood by those skilled in the art that the following examples are only for illustrating the present invention and should not be construed as limiting the scope of the present invention. The specific conditions are not noted in the examples and are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention.
Example 1
The sodium ion battery provided by the embodiment comprises a positive electrode plate, a negative electrode plate, an isolating film and electrolyte, and the preparation method of the sodium ion battery comprises the following steps:
(1) Preparing a positive electrode plate: the positive electrode active material 1-A-B, the conductive agent Super P A and the binder PVDF B are mixed according to mass percentage and uniformly dispersed in solvent N-methyl pyrrolidone, wherein A, B is shown in table 1 (A=0.6%, B=1.4%), positive electrode slurry is obtained, and then the positive electrode slurry is coated on a positive electrode current collector aluminum foil, dried and pressed to obtain a positive electrode sheet. The positive electrode plate comprises a current collector and an active material layer arranged on the current collector, wherein the active material layer consists of positive electrode active materials Na 0.833Cu0.167Fe0.333Mn0.5O2, super P and PVDF, the mass of the Super P accounts for 0.6% of the total mass of the active material layer, and the mass of the PVDF accounts for 1.4% of the total mass of the active material layer.
(2) Preparing a negative electrode plate: hard carbon, super P, CMC and SBR were mixed according to 94.3:1.4:1.6:2.7, uniformly dispersing the mixture in N-methylpyrrolidone as a solvent to obtain negative electrode slurry, coating the negative electrode slurry on a negative electrode current collector aluminum foil, drying, and pressing to obtain a negative electrode plate.
(3) Preparing an electrolyte: and uniformly mixing the solvent, the sodium salt and the organic additive to obtain the electrolyte. Wherein the solvent is Propylene Carbonate (PC) and diethyl carbonate (DEC) in a mass ratio of 40:60 (i.e., n=2, m 1=0.4,M2 =0.6), wherein the relative permittivity of PC ε 1 =69, and the relative permittivity of DEC ε 2 =2.8. The sodium salt is sodium hexafluorophosphate (NaPF 6), and the molar concentration of the sodium salt in the electrolyte is 0.5mol/L. The organic additives are Vinylene Carbonate (VC) and fluoroethylene carbonate (FEC), wherein the mass fraction of VC in the electrolyte is 1%, and the mass fraction of FEC in the electrolyte is 3%. C==ε1M1/4+ε2M2/4+N=69×0.4÷4+2.8×0.6÷4+0.5=7.82.A/B+C=0.6%÷1.4%+7.82=8.25.
(4) Assembling a sodium ion battery: and stacking the positive pole piece, the isolating film and the negative pole piece in sequence, enabling the isolating film to be positioned between the positive pole piece and the negative pole piece to play a role of isolation, then winding to obtain a bare cell, placing the bare cell in an aluminum plastic film outer package, injecting the electrolyte, packaging and forming to obtain the sodium ion battery.
The key parameters in this example are shown in table 1.
Example 2 to example 7
The preparation method of the sodium ion battery provided in the embodiment 2 to the embodiment 7 is basically the same as that of the embodiment 1, wherein key parameters of the embodiment 2 to the embodiment 7 are shown in table 1 (other parameters are the same as that of the embodiment 1).
Example 8
The preparation method of the sodium ion battery provided in this example is basically the same as that of example 1, except that in step (1), the conductive agent Super P is replaced with carbon nanotubes of equal mass and the binder PVDF is replaced with SBR of equal mass.
Example 9
The preparation method of the sodium ion battery provided in this example is basically the same as that of example 1, except that in step (3), sodium hexafluorophosphate (NaPF 6) is replaced with sodium difluorosulfonimide, and the molar concentration of sodium salt in the electrolyte is 0.5mol/L.
Example 10
The preparation method of the sodium ion battery provided in this example is basically the same as that of example 1, except that in step (3), the solvent is replaced with EC and EMC in a mass ratio=40:60.
Examples 11 to 14
The preparation method of the sodium ion battery provided in examples 11 to 14 is basically the same as that of example 1, wherein key parameters of examples 11 to 14 are shown in table 1 (the rest parameters are the same as those of example 1).
Comparative examples 1 to 3
The preparation methods of the sodium ion batteries provided in comparative examples 1 to 3 are basically the same as those in example 1, wherein key parameters of comparative examples 1 to 3 are shown in table 1 (the rest parameters are the same as those in example 1).
Table 1 key parameters in each example and each comparative example
Experimental example
The sodium ion batteries prepared in the above examples and comparative examples were subjected to electrochemical tests, and the results are shown in table 2.
The method for testing the capacity retention rate comprises the following steps: the above-mentioned battery was charged to 3.95V at a constant current and constant voltage of 0.5C at 45℃with a cutoff current of 0.05C, and then discharged to 2.0V at a constant current of 1C, respectively. The 500 th cycle capacity retention rate was calculated after 500 cycles of charge/discharge. The calculation formula is as follows: 500 th week capacity retention = 500 th week cycle discharge capacity/first week cycle discharge capacity x 100%.
The method for testing the gas production rate comprises the following steps: and (5) a drainage method.
The test method for sodium precipitation comprises the following steps: and (3) disassembling the battery in a drying room with a dew point of about-40 ℃ and observing the negative electrode plate by naked eyes.
The testing method of the initial impedance and the impedance growth rate comprises the following steps: and fully charging the battery at room temperature, and connecting the anode and the cathode with an alternating current impedance tester and reading. Impedance increase (%) = (500 weeks ACR-initial ACR)/initial acr×100%.
The needling test method comprises the following steps: after the cylindrical battery is fixed horizontally, the tungsten steel needle is used for vertically penetrating into the center of the cylindrical battery and penetrating through the cylindrical battery, and the cylindrical battery does not fire or explode and passes the test. The steel needle parameters were as follows: diameter 5mm; the needle feeding speed was 25mm/s.
Table 2 electrochemical performance of each sodium ion cell
As can be seen from table 2, when the relation c=is satisfiedAnd when A/B+C is more than or equal to 4.3 and less than or equal to 12.9, the sodium ion battery has higher capacity retention rate and lower impedance growth rate, and does not generate phenomena of sodium precipitation and mass gas production, and has good safety performance.
While comparative examples 1-3 did not satisfy the relation 4.3.ltoreq.A/B+C.ltoreq.12.9, resulting in a decrease in the capacity retention or an increase in the impedance growth. In comparative example 2, the sodium precipitation phenomenon occurs because the cyclic ester solvent is not added.
Further, as is clear from comparison of examples 11 to 14 and example 1, parameters such as N, A, B in the preferable range can further increase the capacity retention rate of the sodium ion battery or further decrease the rate of increase in impedance on the premise that the relation 4.3.ltoreq.A/B+C.ltoreq.12.9 is satisfied.
While the invention has been illustrated and described with reference to specific embodiments, it is to be understood that the above embodiments are merely illustrative of the technical aspects of the invention and not restrictive thereof; those of ordinary skill in the art will appreciate that: modifications may be made to the technical solutions described in the foregoing embodiments, or equivalents may be substituted for some or all of the technical features thereof, without departing from the spirit and scope of the present invention; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions; it is therefore intended to cover in the appended claims all such alternatives and modifications as fall within the scope of the invention.
Claims (10)
1. The sodium ion battery is characterized by comprising a positive electrode piece and electrolyte;
the positive electrode plate comprises an active material layer, wherein the active material layer mainly comprises a positive electrode active material, a conductive agent and a binder; the mass of the conductive agent is A, and the mass of the binder is B;
The electrolyte comprises a solvent and sodium salt; the relative dielectric constant of the solvent is epsilon, the solvent comprises n types, wherein n is more than or equal to 2, and the mass ratio of each solvent to the total mass of the solvent is M; the molar concentration of the sodium salt in the electrolyte is N;
The A, the B, the epsilon, the M and the N satisfy the following relation: a/b+c is 4.3.ltoreq.a.ltoreq.12.9, and c= ；
And C is 4.1-10.9.
2. The sodium ion battery of claim 1, comprising at least one of the following features (1) to (2):
(1) The A is 0.6% -3%;
(2) And the B accounts for 1.0% -3.1%.
3. The sodium ion battery of claim 1, comprising at least one of the following features (1) to (3):
(1) The epsilon is 2-100;
(2) M is 0-1;
(3) The N is 0.1-1.5 mol/L.
4. The sodium ion battery of claim 1, comprising at least one of the following features (1) to (2):
(1) The conductive agent comprises at least one of conductive carbon black, conductive graphite, carbon nanotubes and graphene;
(2) The binder includes at least one of polyvinylidene fluoride, polytetrafluoroethylene, polyacrylic acid, styrene-butadiene rubber, polyethylene oxide, sodium carboxymethyl cellulose, and alginate.
5. The sodium ion battery of claim 1, wherein the solvent comprises at least one of a cyclic ester solvent and a chain ester solvent.
6. The sodium ion battery of claim 5, wherein the solvent comprises a mass ratio x: (100-x) a cyclic ester solvent and a chain ester solvent, wherein x=10 to 90.
7. The sodium ion battery of claim 5, wherein the cyclic ester solvent comprises at least one of ethylene carbonate, propylene carbonate, and gamma-butyrolactone;
And/or the chain ester solvent comprises at least one of dimethyl carbonate, diethyl carbonate, methyl ethyl carbonate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate and butyl propionate.
8. The sodium ion battery of claim 1, wherein the sodium salt comprises at least one of sodium hexafluorophosphate, sodium tetrafluoroborate, sodium perchlorate, sodium bis-fluorosulfonyl imide, and sodium bis-trifluoromethanesulfonyl imide.
9. The sodium ion battery of claim 1, comprising at least one of the following features (1) to (3):
(1) The gas yield of the sodium ion battery is less than or equal to 20mL/Ah after 500 weeks of circulation at 45 ℃;
(2) The capacity retention rate of the sodium ion battery at 45 ℃ for 500 weeks is more than or equal to 75%;
(3) The impedance increase rate of the sodium ion battery is less than or equal to 70% after 500 weeks of circulation at 45 ℃.
10. An electrical device comprising a sodium ion battery as claimed in any one of claims 1 to 9.
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| CN116014073A (en) * | 2022-10-21 | 2023-04-25 | 上海领钫新能源科技有限公司 | Negative electrode plate of sodium ion battery, sodium ion battery and application |
| CN116247282A (en) * | 2022-12-12 | 2023-06-09 | 深圳新宙邦科技股份有限公司 | Sodium ion secondary battery |
| CN116314587A (en) * | 2023-03-14 | 2023-06-23 | 上海扬广科技有限责任公司 | Sodium ion battery negative plate and sodium ion battery |
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| CN116014073A (en) * | 2022-10-21 | 2023-04-25 | 上海领钫新能源科技有限公司 | Negative electrode plate of sodium ion battery, sodium ion battery and application |
| CN116247282A (en) * | 2022-12-12 | 2023-06-09 | 深圳新宙邦科技股份有限公司 | Sodium ion secondary battery |
| CN116314587A (en) * | 2023-03-14 | 2023-06-23 | 上海扬广科技有限责任公司 | Sodium ion battery negative plate and sodium ion battery |
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