CN106257721A - A kind of 18650 battery cores of high-energy-density and preparation method thereof - Google Patents
A kind of 18650 battery cores of high-energy-density and preparation method thereof Download PDFInfo
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- CN106257721A CN106257721A CN201610750599.XA CN201610750599A CN106257721A CN 106257721 A CN106257721 A CN 106257721A CN 201610750599 A CN201610750599 A CN 201610750599A CN 106257721 A CN106257721 A CN 106257721A
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- density
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- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 239000003792 electrolyte Substances 0.000 claims abstract description 44
- 239000000463 material Substances 0.000 claims abstract description 36
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 33
- 230000004888 barrier function Effects 0.000 claims abstract description 31
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 30
- 239000010703 silicon Substances 0.000 claims abstract description 30
- 239000002131 composite material Substances 0.000 claims abstract description 23
- 239000007774 positive electrode material Substances 0.000 claims abstract description 23
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000005030 aluminium foil Substances 0.000 claims abstract description 15
- 239000011889 copper foil Substances 0.000 claims abstract description 15
- 239000007773 negative electrode material Substances 0.000 claims abstract description 15
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 14
- OVAQODDUFGFVPR-UHFFFAOYSA-N lithium cobalt(2+) dioxido(dioxo)manganese Chemical compound [Li+].[Mn](=O)(=O)([O-])[O-].[Co+2] OVAQODDUFGFVPR-UHFFFAOYSA-N 0.000 claims abstract description 14
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical group [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 13
- FALRKNHUBBKYCC-UHFFFAOYSA-N 2-(chloromethyl)pyridine-3-carbonitrile Chemical compound ClCC1=NC=CC=C1C#N FALRKNHUBBKYCC-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000000203 mixture Substances 0.000 claims abstract description 12
- 229940014800 succinic anhydride Drugs 0.000 claims abstract description 12
- DEUISMFZZMAAOJ-UHFFFAOYSA-N lithium dihydrogen borate oxalic acid Chemical compound B([O-])(O)O.C(C(=O)O)(=O)O.C(C(=O)O)(=O)O.[Li+] DEUISMFZZMAAOJ-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000002904 solvent Substances 0.000 claims abstract description 8
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical class O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 claims abstract description 7
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 claims description 30
- 239000002002 slurry Substances 0.000 claims description 30
- 239000006258 conductive agent Substances 0.000 claims description 27
- 239000011230 binding agent Substances 0.000 claims description 23
- 239000011248 coating agent Substances 0.000 claims description 21
- 238000000576 coating method Methods 0.000 claims description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- 239000002270 dispersing agent Substances 0.000 claims description 16
- 239000002994 raw material Substances 0.000 claims description 16
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 15
- 239000003795 chemical substances by application Substances 0.000 claims description 14
- 239000012530 fluid Substances 0.000 claims description 14
- 238000002347 injection Methods 0.000 claims description 14
- 239000007924 injection Substances 0.000 claims description 14
- 238000007789 sealing Methods 0.000 claims description 14
- 238000005303 weighing Methods 0.000 claims description 13
- NVVZQXQBYZPMLJ-UHFFFAOYSA-N formaldehyde;naphthalene-1-sulfonic acid Chemical compound O=C.C1=CC=C2C(S(=O)(=O)O)=CC=CC2=C1 NVVZQXQBYZPMLJ-UHFFFAOYSA-N 0.000 claims description 10
- 159000000000 sodium salts Chemical class 0.000 claims description 10
- 150000004945 aromatic hydrocarbons Chemical class 0.000 claims description 9
- 239000007859 condensation product Substances 0.000 claims description 9
- 229920000642 polymer Polymers 0.000 claims description 9
- 239000000843 powder Substances 0.000 claims description 8
- 238000006277 sulfonation reaction Methods 0.000 claims description 8
- 239000008367 deionised water Substances 0.000 claims description 7
- 229910021641 deionized water Inorganic materials 0.000 claims description 7
- 239000012528 membrane Substances 0.000 claims description 7
- 238000005476 soldering Methods 0.000 claims description 7
- IXPNQXFRVYWDDI-UHFFFAOYSA-N 1-methyl-2,4-dioxo-1,3-diazinane-5-carboximidamide Chemical compound CN1CC(C(N)=N)C(=O)NC1=O IXPNQXFRVYWDDI-UHFFFAOYSA-N 0.000 claims description 6
- 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
- 229910021389 graphene Inorganic materials 0.000 claims description 6
- 229910002804 graphite Inorganic materials 0.000 claims description 6
- 239000010439 graphite Substances 0.000 claims description 6
- 229920001296 polysiloxane Polymers 0.000 claims description 6
- 239000000661 sodium alginate Substances 0.000 claims description 6
- 235000010413 sodium alginate Nutrition 0.000 claims description 6
- 229940005550 sodium alginate 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
- 239000002253 acid Substances 0.000 claims description 5
- -1 hexafluoro phosphorus Chemical compound 0.000 claims description 5
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 claims description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- 238000005524 ceramic coating Methods 0.000 claims description 4
- 239000002033 PVDF binder Substances 0.000 claims description 2
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 claims description 2
- 238000004026 adhesive bonding Methods 0.000 claims description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 claims description 2
- 238000010422 painting Methods 0.000 claims description 2
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 2
- 239000000377 silicon dioxide Substances 0.000 claims description 2
- 239000002023 wood Substances 0.000 claims description 2
- 238000009833 condensation Methods 0.000 claims 1
- 230000005494 condensation Effects 0.000 claims 1
- 239000011574 phosphorus Substances 0.000 claims 1
- 229910052698 phosphorus Inorganic materials 0.000 claims 1
- QGHDLJAZIIFENW-UHFFFAOYSA-N 4-[1,1,1,3,3,3-hexafluoro-2-(4-hydroxy-3-prop-2-enylphenyl)propan-2-yl]-2-prop-2-enylphenol Chemical group C1=C(CC=C)C(O)=CC=C1C(C(F)(F)F)(C(F)(F)F)C1=CC=C(O)C(CC=C)=C1 QGHDLJAZIIFENW-UHFFFAOYSA-N 0.000 abstract description 9
- 229910019142 PO4 Inorganic materials 0.000 abstract description 9
- 239000010452 phosphate Substances 0.000 abstract description 9
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 abstract description 9
- VAYTZRYEBVHVLE-UHFFFAOYSA-N 1,3-dioxol-2-one Chemical compound O=C1OC=CO1 VAYTZRYEBVHVLE-UHFFFAOYSA-N 0.000 abstract description 4
- 230000007812 deficiency Effects 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 230000005611 electricity Effects 0.000 description 11
- 238000000034 method Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 5
- 238000003466 welding Methods 0.000 description 5
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 229910001416 lithium ion Inorganic materials 0.000 description 4
- MERJTCXDDLWWSK-UHFFFAOYSA-N 1-methylpyrrole pyrrolidin-2-one Chemical compound CN1C=CC=C1.N1C(CCC1)=O MERJTCXDDLWWSK-UHFFFAOYSA-N 0.000 description 3
- 239000013543 active substance Substances 0.000 description 3
- 239000007767 bonding agent Substances 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 3
- 125000005678 ethenylene group Chemical group [H]C([*:1])=C([H])[*:2] 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- MOLYXOOGDFTUJT-UHFFFAOYSA-L [Li].[Mn](=O)(=O)(O)O.[Co] Chemical compound [Li].[Mn](=O)(=O)(O)O.[Co] MOLYXOOGDFTUJT-UHFFFAOYSA-L 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 1
- 239000005955 Ferric phosphate Substances 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 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 description 1
- 229910052493 LiFePO4 Inorganic materials 0.000 description 1
- 241000195474 Sargassum Species 0.000 description 1
- 239000011149 active material Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000006256 anode slurry Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 1
- 239000006257 cathode slurry Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 239000011883 electrode binding agent Substances 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 229940032958 ferric phosphate Drugs 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- WBJZTOZJJYAKHQ-UHFFFAOYSA-K iron(3+) phosphate Chemical compound [Fe+3].[O-]P([O-])([O-])=O WBJZTOZJJYAKHQ-UHFFFAOYSA-K 0.000 description 1
- 229910000399 iron(III) phosphate Inorganic materials 0.000 description 1
- 229910003002 lithium salt Inorganic materials 0.000 description 1
- 159000000002 lithium salts Chemical class 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000003362 replicative effect Effects 0.000 description 1
- 239000002210 silicon-based material Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 239000007784 solid electrolyte Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
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- 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
- H01M4/64—Carriers or collectors
- H01M4/66—Selection of materials
- H01M4/661—Metal or alloys, e.g. alloy coatings
-
- 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
- H01M10/056—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
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
-
- 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
-
- 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
- H01M4/38—Selection of substances as active materials, active masses, active liquids of elements or alloys
- H01M4/386—Silicon or alloys based on silicon
-
- 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
- H01M4/50—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese
- H01M4/505—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
-
- 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
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- 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
-
- 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
-
- 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
- H01M50/10—Primary casings; Jackets or wrappings
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- 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
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- 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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2300/00—Electrolytes
- H01M2300/0017—Non-aqueous electrolytes
- H01M2300/0025—Organic electrolyte
- H01M2300/0028—Organic electrolyte characterised by the solvent
- H01M2300/0037—Mixture of solvents
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- 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
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- 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
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Composite Materials (AREA)
- Materials Engineering (AREA)
- Secondary Cells (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The present invention relates to field of batteries, disclose 18650 battery cores of a kind of high-energy-density, including shell, positive plate, negative plate, barrier film and electrolyte.The collector of described positive plate is aluminium foil, and positive active material is nickle cobalt lithium manganate 811;The collector of described negative plate is Copper Foil, and negative electrode active material is silicon based composite material;Described barrier film is PP or PE material;The solute of described electrolyte is lithium hexafluoro phosphate and di-oxalate lithium borate, and the solvent of electrolyte is the mixture of at least one in succinic anhydride, fluorinated ethylene carbonate and vinylene carbonate.18650 battery cores of the present invention select specific positive and negative pole material to coordinate, and have the highest energy density, and overcome many technological deficiencies in preparation process, really are able to realize volume production.
Description
Technical field
The present invention relates to field of batteries, 18650 battery cores particularly relating to a kind of high-energy-density and preparation method thereof.
Background technology
18650 is the founder of lithium ion battery, and Sony Corporation of Japan is then for cost-effective and that fix a kind of standard
Property lithium ion battery model, wherein 18 represent a diameter of 18mm, 65 represent a length of 65mm, 0 is expressed as cylindrical battery.Often
18650 batteries seen are divided into lithium ion battery, ferric phosphate lithium cell.Lithium ion battery voltage is 3.6V and 4.2V, LiFePO4
Cell voltage is 3.2V, and capacity is usually 1200mAh-3000mAh, and common capacity is 2200mAh-3600mAh.
Now along with pure electric automobile flourish, the material of existing 18650 batteries and system collocation can not
The demand to energy density of electric automobile can not be met, battery itself must be improved for improving the course continuation mileage of electric automobile
Energy density, therefore needs badly and develops a 18650 batteries being applicable to electric automobile power battery.
Summary of the invention
In order to solve above-mentioned technical problem, the invention provides 18650 battery core and preparation sides thereof of a kind of high-energy-density
Method.18650 battery cores of the present invention select specific positive and negative pole material to coordinate, and have the highest energy density, and are preparing
Journey overcomes many technological deficiencies, really is able to realize volume production.
The concrete technical scheme of the present invention is: 18650 battery cores of a kind of high-energy-density, including shell, positive plate, negative pole
Sheet, barrier film and electrolyte.
The collector of described positive plate is aluminium foil, and positive active material is nickle cobalt lithium manganate 811;The afflux of described negative plate
Body is Copper Foil, and negative electrode active material is silicon based composite material;Described barrier film is PP or PE material;The solute of described electrolyte is six
Lithium fluophosphate and di-oxalate lithium borate, the solvent of electrolyte is at least one in succinic anhydride, fluorinated ethylene carbonate and carbon
The mixture of acid vinylene.
The present invention select nickle cobalt lithium manganate 811 and silicon based composite material respectively as both positive and negative polarity active substance, with above-mentioned
After barrier film, electrolyte coordinate, there is higher energy density.But, silicon-based anode can occur huge in charge and discharge process
Change in volume, causes capacity attenuation quickly.So not having producer to use in batches up to now, this invention takes multiple arranging
Execute the volumetric expansion inhibiting silicon materials, and improve the electrical contact between silicon grain, thus improve silicon to a certain extent
The cyclical stability of negative pole and first charge-discharge efficiency.
One, the use of negative electrode binder, the present invention uses CMC and the sodium alginate of many carboxyls etc. to have many carboxyl structure
Binding agent, so makes carboxyl generation complex reaction make silicon be bonded together more closely, plays the effect that suppression silicon expands.
Two, it is difficult to form stable solid electrolyte interface in conventional lithium hexafluorophosphate electrolyte solution due to silicium cathode
(SEI) film, along with the destruction of electrode structure, constantly forms new SEI film at the silicon face exposed, exacerbates the corrosion of silicon
And capacity attenuation.Therefore the present invention is sub-by adding carbonic acid in the electrolyte that lithium hexafluoro phosphate and di-oxalate lithium borate are solute
Vinyl acetate (is called for short VC), succinic anhydride (SA) or fluorinated ethylene carbonate (FEC).After adding VC, SEI film component can occur
Change, generates the polymer of poly-alkyl lithium carbonates class so that pliability and the adhesive force of SEI film are higher.And add succinic anhydride
Or fluorinated ethylene carbonate (FEC) well improves cycle performance (SA).The SEI film formed in conventional electrolysis liquid is main
Composition is inorganic lithium salt and a small amount of lithium alkylide, and pliability is poor, and by contrast, the SEI film that VC base electrolyte is formed more can adapt to
Silicon change in volume in charge and discharge process and do not rupture, thus improve the cycle performance of battery.Silicium cathode is at mixing electricity
Solve in liquid and there is the more preferable chemical property than in single electrolyte..Additionally, in electrolyte add succinic anhydride (SA) or
Fluorinated ethylene carbonate (FEC) also can improve the cycle performance of silicium cathode.
Three, the another one major reason causing silicium cathode capacity attenuation is that in electrolyte, lithium hexafluoro phosphate decomposition produces micro-
Silicon is caused corrosion by amount HF.And the decomposition of lithium hexafluoro phosphate is primarily due to the existence of hydrone.The present invention is making process
Middle employing fine vacuum, the mode of high pure nitrogen circulation makes in battery core the content of water at below 100PPm.
Four, the cylindrical structure of high internal pressure can be born in profile employing so that negative pole is when expanding, and shell has enough
Bearing capacity, stop negative pole expansion.
As preferably, the conductive agent on described positive plate, negative plate is superp Li, CNT, graphene conductive agent
In one or several, the binding agent on positive plate is Kynoar.
As preferably, the dispersant on described positive plate is sulfonated aromatic hydrocarbon polymer.
Additionally, in the preparation process of existing conventional lithium battery, the dispersant in anode and cathode slurry is raw in reality application
In product, dispersion effect is not especially desirable, causes insufficient strength after final slurry curing, collection liquid surface positive active material and
Pole plate deforms, and is also not easily controlled the weight of pole plate, and the difficulty increasing coated plate can cause the cost allowance of process simultaneously.This
Bright selection sulfonated aromatic hydrocarbon polymer is mixed with beneficially additive as dispersant, sulfonated aromatic hydrocarbon polymer and other compositions of slurry and exists
Dispersion effect in active substance, the active material layer after solidification can obtain more preferable homogeneity.Sulfonated aromatic hydrocarbon polymer is easy
Produce in replicating, reduce production cost and step, can promote on a large scale.Sulfonated aromatic hydrocarbon polymer can be accelerated simultaneously
Battery charging switching rate, shortens the charging interval.Sulfonated aromatic hydrocarbon polymer can reduce additive and active substance incorporation time, allows
Pole plate produces more preferable framework to resist negative plate convergent-divergent in charge and discharge process.
As preferably, described sulfonated aromatic hydrocarbon polymer is the relative molecular mass naphthalenesulfonateformaldehyde formaldehyde at 10000-16000
Condensation product sodium salt, and the sulfonation degree of the condensation product sodium salt of naphthalenesulfonateformaldehyde formaldehyde is 70-100%.
Condensation product sodium salt as a molecular weight, naphthalenesulfonateformaldehyde formaldehyde that sulfonation degree is higher can use dispersant, with go from
The dissolubility during mixing of sub-water is easy for having reached 200g/L and is even up to 300g/L, soluble in water, and dispersion effect is good.
As preferably, the binding agent on described negative plate is at least one in sodium carboxymethyl cellulose, sodium alginate.
As preferably, described barrier film is provided with coating, and described coating is polyvinylidene fluoride coating or ceramic coating.
As preferably, the collector thickness of described positive plate is 6-12 μm, and the thickness of the collector of described negative plate is 6-
10μm。
As preferably, the described nickle cobalt lithium manganate 811 gram volume under 4.2V-2.5V voltage is more than 200mAh/g, energy
Metric density is at more than 694wh/kg;In described silicon based composite material, silicone content is 42wt%, content of graphite 58wt%, silica-based composite wood
Gram volume under material 4.2V-2.5V voltage is more than 650mAh/g, and energy density is at more than 2340wh/kg.
The preparation method of 18650 battery cores of a kind of above-mentioned high-energy-density, comprises the following steps:
(1) material prepares: prepares positive active material and conductive agent and carries out powder and be dried;
(2) positive pole homogenate: weighing following material by weight percent: positive active material is 95%-98%, conductive agent is 0.5%-
2.0%, binding agent is 0.5%-2.5%, and dispersant is 0.5%-1.0%;The speed of above-mentioned raw materials revolution 10Hz-15Hz is carried out
Premix, adds N-Methyl pyrrolidone, is adjusted to the slurry that viscosity is 7500 ± 1000Pa.s;
(3) negative pole homogenate: weighing following material by weight percent: negative electrode active material is 94%-97.7%, binding agent is
2.0%-4.0%, conductive agent is 0.3%-2.0%;The speed of above-mentioned raw materials revolution 10Hz-15Hz is premixed, is subsequently adding
Deionized water, is adjusted to the slurry that viscosity is 2500 ± 1000Pa.s;
(4) coating: being coated on aluminium foil by the slurry prepared in step (2), coated side density is 490-510g/m2, by step
(3) slurry prepared in is coated on Copper Foil, and coated face density is 80-150g/m2;
(5) film-making: being pressed by positive plate is thick 144 μm-156 μm, is thick 53 μm-98 μm by negative plate pressure;Then divided by banding machine
Sheet, then by soldering polar ear on full-automatic pelleter, and tapes;
(6) assembling: positive plate, the barrier film of 6-16 μ m-thick, negative plate, the membrane coil of 6-16 μ m-thick are coiled into by automatic winding-machine
The core of a diameter of 17.0-17.5mm, being then charged into internal diameter is 17.8mm, in the box hat of a height of 18.2mm, welds both positive and negative polarity pole
Toast after ear, it is ensured that positive pole water content is at below 100ppm, and negative pole can carry out fluid injection after below 300ppm;
(7) fluid injection: humidity be less than dew point-50 DEG C glove box in, inject 5.0 ± 0.5g electrolyte, evacuation stand treat
Through row sealing after electrolyte dry-out, after sealing, height is 18.0 ± 0.5mm.
(8) forming and capacity dividing: after standing 48 hours at 45 DEG C, with 0.2C electric current charging 10min, then with 0.6C electric current charging 80
Minute, with 0.6C constant current constant voltage to 4.35V after standing 36 hours, then with 0.6C electric current constant-current discharge to 2.5V, recording capacity.
The present invention is through specific forming and capacity dividing technique so that battery has preferable performance.
It is compared with the prior art, the invention has the beneficial effects as follows: 18650 battery cores of the present invention select specific both positive and negative polarity material
Material coordinates, and has the highest energy density, and overcomes many technological deficiencies in preparation process, really is able to realization amount
Produce.
Detailed description of the invention
Below in conjunction with embodiment, the invention will be further described.
Embodiment 1
18650 battery cores of a kind of high-energy-density, including shell, positive plate, negative plate, barrier film and electrolyte.
The collector of described positive plate is aluminium foil, and positive active material is nickle cobalt lithium manganate 811.Leading on described positive plate
Electricity agent is superp Li, and binding agent is Kynoar.Dispersant on described positive plate is that relative molecular mass is at 10000-
16000, sulfonation degree is the condensation product sodium salt of naphthalenesulfonateformaldehyde formaldehyde of 70-100%.
The collector of described negative plate is Copper Foil, and negative electrode active material is silicon based composite material;Leading on described negative plate
Electricity agent is superp Li, and the binding agent on described negative plate is sodium carboxymethyl cellulose.
Wherein, the collector thickness of described positive plate is 9 μm, and the thickness of the collector of described negative plate is 8 μm.Described nickel
The cobalt manganic acid lithium 811 gram volume under 4.2V-2.5V voltage is more than 200mAh/g, and energy density is at more than 694wh/kg;Institute
Stating silicone content in silicon based composite material is 42wt%, content of graphite 58wt%, gram appearance under silicon based composite material 4.2V-2.5V voltage
Amount is more than 650mAh/g, and energy density is at more than 2340wh/kg.
The solute of described electrolyte is lithium hexafluoro phosphate and di-oxalate lithium borate, and the solvent of electrolyte is succinic anhydride and carbon
The mixture of acid vinylene.Described barrier film is PP material, and described barrier film is provided with coating, and described coating is that Kynoar is coated with
Layer.
The preparation method of 18650 battery cores of a kind of above-mentioned high-energy-density, comprises the following steps:
(1) material prepares: prepares positive active material and conductive agent and carries out powder and be dried;
(2) positive pole homogenate: weighing following material by weight percent: positive active material is 96.5%, conductive agent is 1.25%, viscous
Knot agent is 1.5%, and dispersant is 0.75%;The speed of above-mentioned raw materials revolution 10Hz-15Hz is premixed, adds N-methyl
Ketopyrrolidine, is adjusted to the slurry that viscosity is 7500 ± 1000Pa.s;
(3) negative pole homogenate: weighing following material by weight percent: negative electrode active material is 96%, binding agent is 3%, conductive agent
It is 1%;The speed of above-mentioned raw materials revolution 10Hz-15Hz being premixed, be subsequently adding deionized water, being adjusted to viscosity is 2500
The slurry of ± 1000Pa.s;
(4) coating: being coated on aluminium foil by the slurry prepared in step (2), coated side density is 500g/m2, by step (3)
In prepare slurry be coated on Copper Foil, coated face density is 115g/m2;
(5) film-making: being pressed by positive plate is thick 150 μm, is thick 75 μm by negative plate pressure;Then by banding machine burst, then by entirely
Automatically soldering polar ear on pelleter, and tape;
(6) assembling: positive plate, the barrier film of 11 μ m-thick, negative plate, the membrane coil of 11 μ m-thick are coiled into diameter by automatic winding-machine
For the core of 17.0-17.5mm, being then charged into internal diameter is 17.8mm, in the box hat of a height of 18.2mm, after welding both positive and negative polarity lug
Toast, it is ensured that positive pole water content is at below 100ppm, and negative pole can carry out fluid injection after below 300ppm;
(7) fluid injection: humidity be less than dew point-50 DEG C glove box in, inject 5.0 ± 0.5g electrolyte, evacuation stand treat
Through row sealing after electrolyte dry-out, after sealing, height is 18.0 ± 0.5mm.
(8) forming and capacity dividing: after standing 48 hours at 45 DEG C, with 0.2C electric current charging 10min, then with 0.6C electric current charging 80
Minute, with 0.6C constant current constant voltage to 4.35V after standing 36 hours, then with 0.6C electric current constant-current discharge to 2.5V, recording capacity.
Embodiment 2
18650 battery cores of a kind of high-energy-density, including shell, positive plate, negative plate, barrier film and electrolyte.
The collector of described positive plate is aluminium foil, and positive active material is nickle cobalt lithium manganate 811.Leading on described positive plate
Electricity agent is CNT, and binding agent is Kynoar.Dispersant on described positive plate is that relative molecular mass is at 10000-
16000, sulfonation degree is the condensation product sodium salt of naphthalenesulfonateformaldehyde formaldehyde of 70-100%.
The collector of described negative plate is Copper Foil, and negative electrode active material is silicon based composite material;Leading on described negative plate
Electricity agent is CNT, and the binding agent on described negative plate is sodium alginate.
Wherein, the collector thickness of described positive plate is 6 μm, and the thickness of the collector of described negative plate is 6 μm.Described nickel
The cobalt manganic acid lithium 811 gram volume under 4.2V-2.5V voltage is more than 200mAh/g, and energy density is at more than 694wh/kg;Institute
Stating silicone content in silicon based composite material is 42wt%, content of graphite 58wt%, gram appearance under silicon based composite material 4.2V-2.5V voltage
Amount is more than 650mAh/g, and energy density is at more than 2340wh/kg.
The solute of described electrolyte is lithium hexafluoro phosphate and di-oxalate lithium borate, and the solvent of electrolyte is fluoro ethylene carbonate
Ester and the mixture of vinylene carbonate.Described barrier film is PE material.Described barrier film is provided with coating, and described coating is that pottery is coated with
Layer.
The preparation method of 18650 battery cores of a kind of above-mentioned high-energy-density, comprises the following steps:
(1) material prepares: prepares positive active material and conductive agent and carries out powder and be dried;
(2) positive pole homogenate: weighing following material by weight percent: positive active material is 95%, conductive agent is 2.0%, bonding
Agent is 2.5%, and dispersant is 0.5%;The speed of above-mentioned raw materials revolution 10Hz-15Hz is premixed, adds N-methyl pyrrole
Pyrrolidone, is adjusted to the slurry that viscosity is 7500 ± 1000Pa.s;
(3) negative pole homogenate: weighing following material by weight percent: negative electrode active material is 94%, binding agent is 4.0%, conduction
Agent is 2.0%;The speed of above-mentioned raw materials revolution 10Hz-15Hz being premixed, be subsequently adding deionized water, being adjusted to viscosity is
The slurry of 2500 ± 1000Pa.s;
(4) coating: being coated on aluminium foil by the slurry prepared in step (2), coated side density is 490g/m2, by step (3)
In prepare slurry be coated on Copper Foil, coated face density is 80g/m2;
(5) film-making: being pressed by positive plate is thick 144 μm, is thick 53 μm by negative plate pressure;Then by banding machine burst, then by entirely
Automatically soldering polar ear on pelleter, and tape;
(6) assembling: positive plate, the barrier film of 6 μ m-thick, negative plate, the membrane coil of 6 μ m-thick are coiled into a diameter of by automatic winding-machine
The core of 17.0-17.5mm, being then charged into internal diameter is 17.8mm, and in the box hat of a height of 18.2mm, welding both positive and negative polarity lug is laggard
Row baking, it is ensured that positive pole water content is at below 100ppm, and negative pole can carry out fluid injection after below 300ppm;
(7) fluid injection: humidity be less than dew point-50 DEG C glove box in, inject 5.0 ± 0.5g electrolyte, evacuation stand treat
Through row sealing after electrolyte dry-out, after sealing, height is 18.0 ± 0.5mm.
(8) forming and capacity dividing: after standing 48 hours at 45 DEG C, with 0.2C electric current charging 10min, then with 0.6C electric current charging 80
Minute, with 0.6C constant current constant voltage to 4.35V after standing 36 hours, then with 0.6C electric current constant-current discharge to 2.5V, recording capacity.
Embodiment 3
18650 battery cores of a kind of high-energy-density, including shell, positive plate, negative plate, barrier film and electrolyte.
The collector of described positive plate is aluminium foil, and positive active material is nickle cobalt lithium manganate 811.Leading on described positive plate
Electricity agent is graphene conductive agent, and binding agent is Kynoar.Dispersant on described positive plate is that relative molecular mass exists
10000-16000, sulfonation degree are the condensation product sodium salt of the naphthalenesulfonateformaldehyde formaldehyde of 70-100%.
The collector of described negative plate is Copper Foil, and negative electrode active material is silicon based composite material;Leading on described negative plate
Electricity agent is graphene conductive agent.Binding agent on described negative plate is sodium carboxymethyl cellulose and sodium alginate.
Wherein, the collector thickness of described positive plate is 12 μm, and the thickness of the collector of described negative plate is 10 μm.Described
The nickle cobalt lithium manganate 811 gram volume under 4.2V-2.5V voltage is more than 200mAh/g, and energy density is at more than 694wh/kg;
In described silicon based composite material, silicone content is 42wt%, content of graphite 58wt%, under silicon based composite material 4.2V-2.5V voltage gram
Capacity is more than 650mAh/g, and energy density is at more than 2340wh/kg.
The solute of described electrolyte is lithium hexafluoro phosphate and di-oxalate lithium borate, and the solvent of electrolyte is succinic anhydride, fluorine
Mixture for ethylene carbonate Yu vinylene carbonate.Described barrier film is PP material.Described barrier film is provided with coating, described painting
Layer is ceramic coating.
The preparation method of 18650 battery cores of a kind of above-mentioned high-energy-density, comprises the following steps:
(1) material prepares: prepares positive active material and conductive agent and carries out powder and be dried;
(2) positive pole homogenate: weighing following material by weight percent: positive active material is 98%, conductive agent is 0.5%, bonding
Agent is 0.5%, and dispersant is 1.0%;The speed of above-mentioned raw materials revolution 10Hz-15Hz is premixed, adds N-methyl pyrrole
Pyrrolidone, is adjusted to the slurry that viscosity is 7500 ± 1000Pa.s;
(3) negative pole homogenate: weigh following material by weight percent: negative electrode active material is 97.7%, and binding agent is 2.0%, leads
Electricity agent is 0.3%;The speed of above-mentioned raw materials revolution 10Hz-15Hz is premixed, is subsequently adding deionized water, is adjusted to viscosity
It it is the slurry of 2500 ± 1000Pa.s;
(4) coating: being coated on aluminium foil by the slurry prepared in step (2), coated side density is 510g/m2, by step (3)
In prepare slurry be coated on Copper Foil, coated face density is 150g/m2;
(5) film-making: being pressed by positive plate is thick 156 μm, is thick 98 μm by negative plate pressure;Then by banding machine burst, then by entirely
Automatically soldering polar ear on pelleter, and tape;
(6) assembling: positive plate, the barrier film of 16 μ m-thick, negative plate, the membrane coil of 16 μ m-thick are coiled into diameter by automatic winding-machine
For the core of 17.0-17.5mm, being then charged into internal diameter is 17.8mm, in the box hat of a height of 18.2mm, after welding both positive and negative polarity lug
Toast, it is ensured that positive pole water content is at below 100ppm, and negative pole can carry out fluid injection after below 300ppm;
(7) fluid injection: humidity be less than dew point-50 DEG C glove box in, inject 5.0 ± 0.5g electrolyte, evacuation stand treat
Through row sealing after electrolyte dry-out, after sealing, height is 18.0 ± 0.5mm.
(8) forming and capacity dividing: after standing 48 hours at 45 DEG C, with 0.2C electric current charging 10min, then with 0.6C electric current charging 80
Minute, with 0.6C constant current constant voltage to 4.35V after standing 36 hours, then with 0.6C electric current constant-current discharge to 2.5V, recording capacity.
Embodiment 4
18650 battery cores of a kind of high-energy-density, including shell, positive plate, negative plate, barrier film and electrolyte.
The collector of described positive plate is aluminium foil, and positive active material is nickle cobalt lithium manganate 811.Leading on described positive plate
Electricity agent is CNT, and binding agent is Kynoar.Dispersant on described positive plate is that relative molecular mass is at 10000-
16000, sulfonation degree is the condensation product sodium salt of naphthalenesulfonateformaldehyde formaldehyde of 70-100%.
The collector of described negative plate is Copper Foil, and negative electrode active material is silicon based composite material;Gluing on described negative plate
Knot agent is sodium carboxymethyl cellulose and sodium alginate.
Wherein, the collector thickness of described positive plate is 6-12 μm, and the thickness of the collector of described negative plate is 6-10 μm.
The described nickle cobalt lithium manganate 811 gram volume under 4.2V-2.5V voltage is more than 200mAh/g, energy density 694wh/kg with
On;In described silicon based composite material, silicone content is 42wt%, content of graphite 58wt%, under silicon based composite material 4.2V-2.5V voltage
Gram volume be more than 650mAh/g, energy density is at more than 2340wh/kg.
The solute of described electrolyte is lithium hexafluoro phosphate and di-oxalate lithium borate, and the solvent of electrolyte is succinic anhydride and carbon
The mixture of acid vinylene.Described barrier film is PP material.Described barrier film is provided with coating, and described coating is ceramic coating.
The preparation method of 18650 battery cores of a kind of above-mentioned high-energy-density, comprises the following steps:
(1) material prepares: prepares positive active material and conductive agent and carries out powder and be dried;
(2) positive pole homogenate: weighing following material by weight percent: positive active material is 96%, conductive agent is 1%, binding agent
Being 2%, dispersant is 1%;The speed of above-mentioned raw materials revolution 10Hz-15Hz is premixed, adds N-Methyl pyrrolidone,
It is adjusted to the slurry that viscosity is 7500 ± 1000Pa.s;
(3) negative pole homogenate: weighing following material by weight percent: negative electrode active material is 95%, binding agent is 4%, conductive agent
It is 1%;The speed of above-mentioned raw materials revolution 10Hz-15Hz being premixed, be subsequently adding deionized water, being adjusted to viscosity is 2500
The slurry of ± 1000Pa.s;
(4) coating: being coated on aluminium foil by the slurry prepared in step (2), coated side density is 500g/m2, by step (3)
In prepare slurry be coated on Copper Foil, coated face density is 100g/m2;
(5) film-making: being pressed by positive plate is thick 150 μm, is thick 75 μm by negative plate pressure;Then by banding machine burst, then by entirely
Automatically soldering polar ear on pelleter, and tape;
(6) assembling: positive plate, the barrier film of 8 μ m-thick, negative plate, the membrane coil of 8 μ m-thick are coiled into a diameter of by automatic winding-machine
The core of 17.0-17.5mm, being then charged into internal diameter is 17.8mm, and in the box hat of a height of 18.2mm, welding both positive and negative polarity lug is laggard
Row baking, it is ensured that positive pole water content is at below 100ppm, and negative pole can carry out fluid injection after below 300ppm;
(7) fluid injection: humidity be less than dew point-50 DEG C glove box in, inject 5.0 ± 0.5g electrolyte, evacuation stand treat
Through row sealing after electrolyte dry-out, after sealing, height is 18.0 ± 0.5mm.
(8) forming and capacity dividing: after standing 48 hours at 45 DEG C, with 0.2C electric current charging 10min, then with 0.6C electric current charging 80
Minute, with 0.6C constant current constant voltage to 4.35V after standing 36 hours, then with 0.6C electric current constant-current discharge to 2.5V, recording capacity.
Embodiment 5
18650 battery cores of a kind of high-energy-density, including shell, positive plate, negative plate, barrier film and electrolyte.
The collector of described positive plate is aluminium foil, and positive active material is nickle cobalt lithium manganate 811.Leading on described positive plate
Electricity agent is CNT and graphene conductive agent composition, and binding agent is Kynoar.Dispersant on described positive plate is
Relative molecular mass is at the condensation product sodium salt of the naphthalenesulfonateformaldehyde formaldehyde that 10000-16000, sulfonation degree are 70-100%.
The collector of described negative plate is Copper Foil, and negative electrode active material is silicon based composite material;Leading on described positive plate
Electricity agent is CNT and graphene conductive agent composition.Binding agent on described negative plate is sodium carboxymethyl cellulose and Sargassum
Acid sodium.
Wherein, the collector thickness of described positive plate is 9 μm, and the thickness of the collector of described negative plate is 8 μm.
The described nickle cobalt lithium manganate 811 gram volume under 4.2V-2.5V voltage is more than 200mAh/g, and energy density exists
More than 694wh/kg;Described silicon based composite material uses Shenzhen City Beiterui New Energy Materials Co., Ltd model to be s650
The negative pole of model, the gram volume under silicon based composite material 4.2V-2.5V voltage is more than 650mAh/g, and energy density exists
More than 2340wh/kg.
The solute of described electrolyte is lithium hexafluoro phosphate and di-oxalate lithium borate, and the solvent of electrolyte is fluoro ethylene carbonate
Ester and the mixture of vinylene carbonate.Described barrier film is PP material.Described barrier film is provided with coating, and described coating is that pottery is coated with
Layer.
The preparation method of 18650 battery cores of a kind of above-mentioned high-energy-density, comprises the following steps:
(1) material prepares: prepares positive active material and conductive agent and carries out powder and be dried;
(2) positive pole homogenate: weighing following material by weight percent: positive active material is 98%, conductive agent is 0.5%, bonding
Agent is 0.5%, and dispersant is 1.0%;The speed of above-mentioned raw materials revolution 10Hz-15Hz is premixed, adds N-methyl pyrrole
Pyrrolidone, is adjusted to the slurry that viscosity is 7500 ± 1000Pa.s;
(3) negative pole homogenate: weighing following material by weight percent: negative electrode active material is 96%, binding agent is 2%, conductive agent
It is 2%;The speed of above-mentioned raw materials revolution 10Hz-15Hz being premixed, be subsequently adding deionized water, being adjusted to viscosity is 2500
The slurry of ± 1000Pa.s;
(4) coating: being coated on aluminium foil by the slurry prepared in step (2), coated side density is 490-510g/m2, by step
(3) slurry prepared in is coated on Copper Foil, and coated face density is 80-150g/m2;
(5) film-making: being pressed by positive plate is thick 150 μm, is thick 98 μm by negative plate pressure;Then by banding machine burst, then by entirely
Automatically soldering polar ear on pelleter, and tape;
(6) assembling: positive plate, the barrier film of 12 μ m-thick, negative plate, the membrane coil of 12 μ m-thick are coiled into diameter by automatic winding-machine
For the core of 17.0-17.5mm, being then charged into internal diameter is 17.8mm, in the box hat of a height of 18.2mm, after welding both positive and negative polarity lug
Toast, it is ensured that positive pole water content is at below 100ppm, and negative pole can carry out fluid injection after below 300ppm;
(7) fluid injection: humidity be less than dew point-50 DEG C glove box in, inject 5.0 ± 0.5g electrolyte, evacuation stand treat
Through row sealing after electrolyte dry-out, after sealing, height is 18.0 ± 0.5mm.
(8) forming and capacity dividing: after standing 48 hours at 45 DEG C, with 0.2C electric current charging 10min, then with 0.6C electric current charging 80
Minute, with 0.6C constant current constant voltage to 4.35V after standing 36 hours, then with 0.6C electric current constant-current discharge to 2.5V, recording capacity.
Raw materials used, equipment in the present invention, unless otherwise noted, is the conventional raw material of this area, equipment;In the present invention
Method therefor, unless otherwise noted, is the conventional method of this area.
The above, be only presently preferred embodiments of the present invention, not impose any restrictions the present invention, every according to the present invention
Any simple modification, change and the equivalent transformation that above example is made by technical spirit, all still falls within the technology of the present invention side
The protection domain of case.
Claims (9)
1. 18650 battery cores of high-energy-density, including shell, positive plate, negative plate, barrier film and electrolyte;Its feature exists
In: the collector of described positive plate is aluminium foil, and positive active material is nickle cobalt lithium manganate 811;The collector of described negative plate is
Copper Foil, negative electrode active material is silicon based composite material;Described barrier film is PP or PE material;The solute of described electrolyte is hexafluoro phosphorus
Acid lithium and di-oxalate lithium borate, the solvent of electrolyte is that at least one in succinic anhydride, fluorinated ethylene carbonate is sub-with carbonic acid
The mixture of vinyl acetate.
18650 battery cores of a kind of high-energy-density the most as claimed in claim 1, it is characterised in that described positive plate, negative plate
On conductive agent be superp Li, CNT, in graphene conductive agent one or several, the binding agent on positive plate is
Kynoar.
18650 battery cores of a kind of high-energy-density the most as claimed in claim 2, it is characterised in that dividing on described positive plate
Powder is sulfonated aromatic hydrocarbon polymer.
18650 battery cores of a kind of high-energy-density the most as claimed in claim 3, it is characterised in that described sulfonated aromatic hydrocarbon is polymerized
Thing is the relative molecular mass condensation product sodium salt at the naphthalenesulfonateformaldehyde formaldehyde of 10000-16000, and the condensation of naphthalenesulfonateformaldehyde formaldehyde is produced
The sulfonation degree of thing sodium salt is 70-100%.
18650 battery cores of a kind of high-energy-density the most as claimed in claim 1, it is characterised in that gluing on described negative plate
Knot agent is at least one in sodium carboxymethyl cellulose, sodium alginate.
18650 battery cores of a kind of high-energy-density the most as claimed in claim 1, it is characterised in that described barrier film is provided with painting
Layer, described coating is polyvinylidene fluoride coating or ceramic coating.
18650 battery cores of a kind of high-energy-density the most as claimed in claim 1, it is characterised in that the afflux of described positive plate
Body thickness is 6-12 μm, and the thickness of the collector of described negative plate is 6-10 μm.
18650 battery cores of a kind of high-energy-density the most as claimed in claim 1, it is characterised in that described nickle cobalt lithium manganate 811
Gram volume under 4.2V-2.5V voltage is more than 200mAh/g, and energy density is at more than 694wh/kg;Described silica-based composite wood
In material, silicone content is 42wt%, content of graphite 58wt%, and the gram volume under silicon based composite material 4.2V-2.5V voltage is 650mAh/g
Above, energy density is at more than 2340wh/kg.
9. the preparation method of 18650 battery cores of a kind of high-energy-density as described in claim 1-8 is arbitrary, it is characterised in that
Comprise the following steps:
(1) material prepares: prepares positive active material and conductive agent and carries out powder and be dried;
(2) positive pole homogenate: weighing following material by weight percent: positive active material is 95%-98%, conductive agent is 0.5%-
2.0%, binding agent is 0.5%-2.5%, and dispersant is 0.5%-1.0%;The speed of above-mentioned raw materials revolution 10Hz-15Hz is carried out
Premix, adds N-Methyl pyrrolidone, is adjusted to the slurry that viscosity is 7500 ± 1000Pa.s;
(3) negative pole homogenate: weighing following material by weight percent: negative electrode active material is 94%-97.7%, binding agent is
2.0%-4.0%, conductive agent is 0.3%-2.0%;The speed of above-mentioned raw materials revolution 10Hz-15Hz is premixed, is subsequently adding
Deionized water, is adjusted to the slurry that viscosity is 2500 ± 1000Pa.s;
(4) coating: being coated on aluminium foil by the slurry prepared in step (2), coated side density is 490-510g/m2, by step
(3) slurry prepared in is coated on Copper Foil, and coated face density is 80-150g/m2;
(5) film-making: being pressed by positive plate is thick 144 μm-156 μm, is thick 53 μm-98 μm by negative plate pressure;Then divided by banding machine
Sheet, then by soldering polar ear on full-automatic pelleter, and tapes;
(6) assembling: positive plate, the barrier film of 6-16 μ m-thick, negative plate, the membrane coil of 6-16 μ m-thick are coiled into by automatic winding-machine
The core of a diameter of 17.0-17.5mm, being then charged into internal diameter is 17.8mm, in the box hat of a height of 18.2mm, welds both positive and negative polarity pole
Toast after ear, it is ensured that positive pole water content is at below 100ppm, and negative pole can carry out fluid injection after below 300ppm;
(7) fluid injection: humidity be less than dew point-50 DEG C glove box in, inject 5.0 ± 0.5g electrolyte, evacuation stand treat
Through row sealing after electrolyte dry-out, after sealing, height is 18.0 ± 0.5mm;
(8) forming and capacity dividing: after standing 48 hours at 45 DEG C, with 0.2C electric current charging 10min, then charges 80 points with 0.6C electric current
Clock, with 0.6C constant current constant voltage to 4.35V after standing 36 hours, then with 0.6C electric current constant-current discharge to 2.5V, recording capacity.
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CN108346794A (en) * | 2017-01-25 | 2018-07-31 | 武汉理工力强能源有限公司 | A kind of preparation method based on metallic lithium powder Yu graphite cathode battery |
CN108428930A (en) * | 2018-04-09 | 2018-08-21 | 惠州市赛能电池有限公司 | A kind of method for making electric core of the negative plate containing silicon substrate |
CN109103448A (en) * | 2018-07-13 | 2018-12-28 | 金川集团股份有限公司 | A kind of high capacity cylinder flexible packing lithium ion battery and its manufacturing method |
CN115188922A (en) * | 2022-06-24 | 2022-10-14 | 江苏正力新能电池技术有限公司 | Silicon-based negative pole piece, secondary battery containing same and electricity utilization device |
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CN101728515A (en) * | 2004-11-08 | 2010-06-09 | 爱来克株式会社 | Positive electrode |
CN104638234A (en) * | 2015-01-04 | 2015-05-20 | 深圳市贝特瑞新能源材料股份有限公司 | Negative active substance, negative pole piece and preparation method thereof as well as lithium ion battery |
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CN1891668A (en) * | 2005-07-08 | 2007-01-10 | 中国科学院物理研究所 | Carbon-silicon composite material with spherical nucleocapsid, and its preparing method and use |
CN101302341A (en) * | 2007-05-09 | 2008-11-12 | 郑州泰达电子材料科技有限公司 | Conductive composite material, composite electrode, and super large capacitor and lithium battery using the composite electrode |
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CN108346794A (en) * | 2017-01-25 | 2018-07-31 | 武汉理工力强能源有限公司 | A kind of preparation method based on metallic lithium powder Yu graphite cathode battery |
CN108428930A (en) * | 2018-04-09 | 2018-08-21 | 惠州市赛能电池有限公司 | A kind of method for making electric core of the negative plate containing silicon substrate |
CN109103448A (en) * | 2018-07-13 | 2018-12-28 | 金川集团股份有限公司 | A kind of high capacity cylinder flexible packing lithium ion battery and its manufacturing method |
CN115188922A (en) * | 2022-06-24 | 2022-10-14 | 江苏正力新能电池技术有限公司 | Silicon-based negative pole piece, secondary battery containing same and electricity utilization device |
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