CN106257721B - 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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- CN106257721B CN106257721B CN201610750599.XA CN201610750599A CN106257721B CN 106257721 B CN106257721 B CN 106257721B CN 201610750599 A CN201610750599 A CN 201610750599A CN 106257721 B CN106257721 B CN 106257721B
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- negative electrode
- energy density
- positive plate
- electrode tab
- electrolyte
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- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 239000003792 electrolyte Substances 0.000 claims abstract description 38
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 35
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 31
- 239000010703 silicon Substances 0.000 claims abstract description 31
- 239000002131 composite material Substances 0.000 claims abstract description 23
- 239000007774 positive electrode material Substances 0.000 claims abstract description 23
- 239000000463 material Substances 0.000 claims abstract description 21
- 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
- 229940014800 succinic anhydride Drugs 0.000 claims abstract description 12
- 239000000203 mixture Substances 0.000 claims abstract description 11
- 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
- VAYTZRYEBVHVLE-UHFFFAOYSA-N 1,3-dioxol-2-one Chemical compound O=C1OC=CO1 VAYTZRYEBVHVLE-UHFFFAOYSA-N 0.000 claims abstract description 5
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 claims description 30
- 239000002002 slurry Substances 0.000 claims description 30
- 239000011230 binding agent Substances 0.000 claims description 27
- 239000006258 conductive agent Substances 0.000 claims description 26
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 22
- 239000011248 coating agent Substances 0.000 claims description 22
- 238000000576 coating method Methods 0.000 claims description 22
- 239000002270 dispersing agent Substances 0.000 claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- 239000002994 raw material Substances 0.000 claims description 16
- 239000000126 substance Substances 0.000 claims description 15
- 239000012530 fluid Substances 0.000 claims description 14
- 238000002347 injection Methods 0.000 claims description 14
- 239000007924 injection Substances 0.000 claims description 14
- 239000007859 condensation product Substances 0.000 claims description 10
- 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 9
- 238000006277 sulfonation reaction Methods 0.000 claims description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 7
- 239000002041 carbon nanotube Substances 0.000 claims description 7
- 229910021393 carbon nanotube Inorganic materials 0.000 claims description 7
- 239000008367 deionised water Substances 0.000 claims description 7
- 229910021641 deionized water Inorganic materials 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 7
- 239000012528 membrane Substances 0.000 claims description 7
- 239000000843 powder Substances 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 7
- 238000005476 soldering Methods 0.000 claims description 7
- 239000010959 steel Substances 0.000 claims description 7
- 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
- 238000004804 winding Methods 0.000 claims description 6
- 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 3
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 claims description 3
- -1 hexafluoro phosphorus Chemical compound 0.000 claims description 3
- 229910052708 sodium Inorganic materials 0.000 claims description 3
- 239000011734 sodium Substances 0.000 claims description 3
- 239000002033 PVDF binder Substances 0.000 claims description 2
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 2
- 239000000758 substrate Substances 0.000 claims description 2
- 239000002023 wood Substances 0.000 claims description 2
- 229960001126 alginic acid Drugs 0.000 claims 1
- 235000010443 alginic acid Nutrition 0.000 claims 1
- 229920000615 alginic acid Polymers 0.000 claims 1
- 239000000783 alginic acid Substances 0.000 claims 1
- 150000004781 alginic acids Chemical group 0.000 claims 1
- 229910052698 phosphorus Inorganic materials 0.000 claims 1
- 239000011574 phosphorus Substances 0.000 claims 1
- 150000003839 salts Chemical class 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
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical class O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 230000007812 deficiency Effects 0.000 abstract description 3
- 239000003795 chemical substances by application Substances 0.000 description 14
- 239000007788 liquid Substances 0.000 description 9
- 238000000034 method Methods 0.000 description 9
- 229920000642 polymer Polymers 0.000 description 8
- 150000004945 aromatic hydrocarbons Chemical class 0.000 description 7
- 238000005303 weighing Methods 0.000 description 7
- 239000012634 fragment Substances 0.000 description 6
- 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 description 5
- 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 description 5
- 239000001768 carboxy methyl cellulose Substances 0.000 description 5
- 235000010413 sodium alginate Nutrition 0.000 description 5
- 239000000661 sodium alginate Substances 0.000 description 5
- 229940005550 sodium alginate Drugs 0.000 description 5
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 description 5
- 229920001027 sodium carboxymethylcellulose Polymers 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
- 239000011149 active material Substances 0.000 description 4
- 229910001416 lithium ion Inorganic materials 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 3
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 3
- 238000005524 ceramic coating Methods 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 125000005678 ethenylene group Chemical group [H]C([*:1])=C([H])[*:2] 0.000 description 3
- 150000004040 pyrrolidinones Chemical class 0.000 description 3
- ZQCQTPBVJCWETB-UHFFFAOYSA-N 4-fluoro-1,3-dioxol-2-one Chemical group FC1=COC(=O)O1 ZQCQTPBVJCWETB-UHFFFAOYSA-N 0.000 description 2
- 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
- 239000000919 ceramic Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 150000002148 esters Chemical class 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 230000002401 inhibitory effect Effects 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 238000010422 painting Methods 0.000 description 2
- OXHNLMTVIGZXSG-UHFFFAOYSA-N 1-Methylpyrrole Chemical compound CN1C=CC=C1 OXHNLMTVIGZXSG-UHFFFAOYSA-N 0.000 description 1
- 241001474374 Blennius Species 0.000 description 1
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 1
- 239000005955 Ferric phosphate Substances 0.000 description 1
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 1
- 229910052493 LiFePO4 Inorganic materials 0.000 description 1
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 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
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 description 1
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 1
- 239000006257 cathode slurry Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000005611 electricity 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
- 238000005516 engineering process Methods 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
- 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
- 239000002075 main ingredient Substances 0.000 description 1
- 238000002156 mixing Methods 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
- 239000002210 silicon-based material Substances 0.000 description 1
- 239000011856 silicon-based particle 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
- 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
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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
- H01M50/10—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 a kind of 18650 battery cores of high-energy density, including shell, positive plate, negative electrode tab, diaphragm and electrolyte.The collector of the positive plate is aluminium foil, and positive active material is nickle cobalt lithium manganate 811；The collector of the negative electrode tab is copper foil, and negative electrode active material is silicon based composite material；The diaphragm is PP or PE material；The solute of the electrolyte is lithium hexafluoro phosphate and di-oxalate lithium borate, and the solvent of electrolyte is the mixture of at least one of succinic anhydride, fluorinated ethylene carbonate and vinylene carbonate.18650 battery cores of the invention select specific positive and negative pole material cooperation, have very high energy density, and overcome many technological deficiencies during the preparation process, really are able to realize volume production.
Description
Technical field
The present invention relates to field of batteries more particularly to a kind of 18650 battery cores of high-energy density and preparation method thereof.
Background technique
18650 be the founder of lithium ion battery, a kind of standard that Japanese Sony Corporation's current year fixs to save cost
Property lithium ion battery model, wherein 18 indicate diameters be 18mm, 65 indicate length be 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.
Material and the system collocation of now flourishing with pure electric automobile, existing 18650 battery cannot
It is not able to satisfy the demand to energy density of electric car, battery itself must be improved to improve the course continuation mileage of electric car
Energy density, therefore need to develop a 18650 batteries suitable for electric automobile power battery.
Summary of the invention
In order to solve the above-mentioned technical problems, the present invention provides a kind of 18650 battery cores of high-energy density and its preparation sides
Method.18650 battery cores of the invention select specific positive and negative pole material cooperation, have very high energy density, and preparing
Many technological deficiencies are overcome in journey, really are able to realize volume production.
The specific technical proposal of the invention is: a kind of 18650 battery cores of high-energy density, including shell, positive plate, cathode
Piece, diaphragm and electrolyte.
The collector of the positive plate is aluminium foil, and positive active material is nickle cobalt lithium manganate 811；The afflux of the negative electrode tab
Body is copper foil, and negative electrode active material is silicon based composite material；The diaphragm is PP or PE material；The solute of the electrolyte is six
Lithium fluophosphate and di-oxalate lithium borate, the solvent of electrolyte are at least one of succinic anhydride, fluorinated ethylene carbonate and carbon
The mixture of sour vinylene.
The present invention selects nickle cobalt lithium manganate 811 and silicon based composite material respectively as positive and negative anodes active material, and above-mentioned
After diaphragm, electrolyte cooperation, energy density with higher.But silicon-based anode can occur in charge and discharge process it is huge
Volume change leads to capacity attenuation quickly.So can be used in batches without producer up to now, arranged this invention takes a variety of
The volume expansion for inhibiting silicon materials is applied, and improves the electrical contact between silicon particle, to improve silicon to a certain extent
The cyclical stability and first charge-discharge efficiency of cathode.
One, the use of negative electrode binder, the present invention is using the more carboxyl structures of the tool such as the CMC of more carboxyls and sodium alginate
Binder, making carboxyl that complex reaction occur in this way makes silicon is even closer to be bonded together, and plays the role of inhibiting silicon expansion.
Two, it is difficult to form stable solid electrolyte interface in conventional lithium hexafluorophosphate electrolyte solution due to silicium cathode
(SEI) film constantly forms new SEI film in the silicon face exposed, exacerbates the corrosion of silicon with the destruction of electrode structure
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 (abbreviation VC), succinic anhydride (SA) or fluorinated ethylene carbonate (FEC).SEI film component can occur after addition VC
Variation, generates the polymer of poly- alkyl lithium carbonates class, so that the flexibility of SEI film and adhesive force are stronger.And add succinic anhydride
(SA) or fluorinated ethylene carbonate (FEC) improves cycle performance well.The SEI film formed in conventional electrolysis liquid is main
Ingredient is inorganic lithium salt and a small amount of lithium alkylide, and flexibility is poor, and in contrast, the SEI film that VC base electrolyte is formed more can adapt to
Volume change of the silicon in charge and discharge process is without rupturing, to improve the cycle performance of battery.Silicium cathode is in mixing electricity
Solving in liquid has than chemical property better in single electrolyte.In addition, in electrolyte add succinic anhydride (SA) or
The cycle performance of silicium cathode also can be improved in fluorinated ethylene carbonate (FEC).
Three, another major reason for leading to silicium cathode capacity attenuation is that lithium hexafluoro phosphate decomposition generation is micro- in electrolyte
Amount HF causes to corrode to silicon.And the decomposition of lithium hexafluoro phosphate is primarily due to the presence of hydrone.Process is being made in the present invention
Middle to use high vacuum, the mode of high pure nitrogen circulation makes the content of water in battery core in 100PPm or less.
Four, in shape using the cylindrical structure that can bear high internal pressure, so that cathode is during expansion, shell has enough
Bearing capacity, prevent the expansion of cathode.
Preferably, the conductive agent in the positive plate, negative electrode tab is superp Li, carbon nanotube, graphene conductive agent
Middle one or several kinds, the binder on positive plate are Kynoar.
Preferably, the dispersing agent on the positive plate is sulfonated aromatic hydrocarbon polymer.
In addition, the dispersing agent in anode and cathode slurry is raw in practical application in the preparation process of existing conventional lithium battery
Dispersion effect is not especially desirable in production, causes intensity after final slurry curing inadequate, collection liquid surface positive active material and
Pole plate deformation, is also not easily controlled the weight of pole plate, increases the difficulty of coated plate while will cause the cost allowance of process.This hair
Bright selection sulfonated aromatic hydrocarbon polymer is mixed with and exists conducive to additive as dispersing agent, sulfonated aromatic hydrocarbon polymer and slurry other compositions
Dispersion effect in active material, the available better homogeneity of active material layer after solidification.Sulfonated aromatic hydrocarbon polymer is easy
It is produced in duplication, reduces production cost and step, can be promoted on a large scale.Sulfonated aromatic hydrocarbon polymer can be accelerated simultaneously
Battery charging conversion rate, shortens the charging time.Sulfonated aromatic hydrocarbon polymer can be reduced additive and active material incorporation time, allow
Pole plate generates better framework to resist convergent-divergent of the negative plate in charge and discharge process.
Preferably, the sulfonated aromatic hydrocarbon polymer is naphthalenesulfonateformaldehyde formaldehyde of the relative molecular mass in 10000-16000
Condensation product sodium salt, and the sulfonation degree of the condensation product sodium salt of naphthalenesulfonateformaldehyde formaldehyde is 70-100%.
As a molecular weight, the higher naphthalenesulfonateformaldehyde formaldehyde of sulfonation degree condensation product sodium salt can use dispersing agent, with go from
Solubility when sub- water mixes, which is easy for having reached 200g/L, is even up to 300g/L, soluble easily in water, and dispersion effect is good.
Preferably, the binder in the negative electrode tab is at least one of sodium carboxymethylcellulose, sodium alginate.
Preferably, the diaphragm is equipped with coating, the coating is polyvinylidene fluoride coating or ceramic coating.
Preferably, the collector of the positive plate is with a thickness of 6-12 μm, the collector of the negative electrode tab with a thickness of 6-
10μm。
Preferably, gram volume of the nickle cobalt lithium manganate 811 under 4.2V-2.5V voltage is 200mAh/g or more, energy
Metric density is in 694wh/kg or more；Silicone content is 42wt%, content of graphite 58wt%, silicon substrate composite wood in the silicon based composite material
Expect that the gram volume under 4.2V-2.5V voltage is 650mAh/g or more, energy density is in 2340wh/kg or more.
A kind of preparation method of 18650 battery cores of above-mentioned high-energy density, comprising the following steps:
(1) material prepares: preparing positive active material and conductive agent and carries out powder drying；
(2) anode homogenate: weigh following substance by weight percent: positive active material 95%-98%, conductive agent are
0.5%-2.0%, binder 0.5%-2.5%, dispersing agent 0.5%-1.0%；By the above-mentioned raw materials speed of revolution 10Hz-15Hz
It is premixed, adds N-Methyl pyrrolidone, be adjusted to the slurry that viscosity is 7500 ± 1000Pa.s；
(3) cathode is homogenized: weigh following substance by weight percent: negative electrode active material 94%-97.7%, binder are
2.0%-4.0%, conductive agent 0.3%-2.0%；Above-mentioned raw materials are premixed with the speed of revolution 10Hz-15Hz, are then added
Deionized water is adjusted to the slurry that viscosity is 2500 ± 1000Pa.s；
(4) it is coated with: slurry obtained in step (2) is coated on aluminium foil, coating surface density is 490-510g/m2, will
Slurry obtained is coated on copper foil in step (3), coated face density 80-150g/m2；
(5) film-making: being 53 μm -98 μm thick by negative electrode tab pressure by positive plate pressure to be 144 μm -156 μm thick；Then by slitting
Machine fragment then by soldering polar ear on full-automatic pelleter, and is taped；
(6) it assembles: by automatic winding-machine by positive plate, the diaphragm of 6-16 μ m-thick, negative electrode tab, the membrane coil of 6-16 μ m-thick
It is coiled into the core that diameter is 17.0-17.5mm, internal diameter is then charged into as 17.8mm, in the steel shell of a height of 18.2mm, welds positive and negative
It is toasted after the tab of pole, guarantees positive water content in 100ppm hereinafter, cathode can carry out fluid injection after 300ppm or less；
(7) fluid injection: in the glove box that humidity is less than -50 DEG C of dew point, 5.0 ± 0.5g electrolyte is injected, is vacuumized quiet
It sets after liquid to be electrolysed dries up and is sealed, be highly 18.0 ± 0.5mm after sealing.
(8) forming and capacity dividing: after 45 DEG C stand 48 hours, with 0.2C electric current charging 10min, then with 0.6C electric current charging 80
Minute, with 0.6C constant-current charge to 4.35V after standing 36 hours, then with 0.6C electric current constant-current discharge to 2.5V, recording capacity.
The present invention passes through specific forming and capacity dividing technique, so that battery has preferable performance.
It is compared with the prior art, the beneficial effects of the present invention are: 18650 battery cores of the invention select specific positive and negative anodes material
Material cooperation, has very high energy density, and overcome many technological deficiencies during the preparation process, really is able to realization amount
It produces.
Specific embodiment
The present invention will be further described with reference to the examples below.
Embodiment 1
A kind of 18650 battery cores of high-energy density, including shell, positive plate, negative electrode tab, diaphragm and electrolyte.
The collector of the positive plate is aluminium foil, and positive active material is nickle cobalt lithium manganate 811.Leading on the positive plate
Electric agent is superp Li, and binder is Kynoar.Dispersing agent on the positive plate is relative molecular mass in 10000-
16000, sulfonation degree is the condensation product sodium salt of the naphthalenesulfonateformaldehyde formaldehyde of 70-100%.
The collector of the negative electrode tab is copper foil, and negative electrode active material is silicon based composite material；Leading in the negative electrode tab
Electric agent is superp Li, and the binder in the negative electrode tab is sodium carboxymethylcellulose.
Wherein, the collector of the positive plate is with a thickness of 9 μm, the collector of the negative electrode tab with a thickness of 8 μm.The nickel
Gram volume of the cobalt manganic acid lithium 811 under 4.2V-2.5V voltage is 200mAh/g or more, and energy density is in 694wh/kg or more；Institute
Stating in silicon based composite material silicone content is 42wt%, content of graphite 58wt%, gram holding under silicon based composite material 4.2V-2.5V voltage
Amount is 650mAh/g or more, and energy density is in 2340wh/kg or more.
The solute of the electrolyte is lithium hexafluoro phosphate and di-oxalate lithium borate, and the solvent of electrolyte is succinic anhydride and carbon
The mixture of sour vinylene.The diaphragm is PP material, and the diaphragm is equipped with coating, and the coating is Kynoar painting
Layer.
A kind of preparation method of 18650 battery cores of above-mentioned high-energy density, comprising the following steps:
(1) material prepares: preparing positive active material and conductive agent and carries out powder drying；
(2) anode homogenate: weigh following substance by weight percent: positive active material 96.5%, conductive agent are
1.25%, binder 1.5%, dispersing agent 0.75%；Above-mentioned raw materials are premixed with the speed of revolution 10Hz-15Hz, then plus
Enter N-Methyl pyrrolidone, is adjusted to the slurry that viscosity is 7500 ± 1000Pa.s；
(3) cathode is homogenized: weighing following substance: negative electrode active material 96% by weight percent, binder 3% is led
Electric agent is 1%；Above-mentioned raw materials are premixed with the speed of revolution 10Hz-15Hz, deionized water are then added, being adjusted to viscosity is
The slurry of 2500 ± 1000Pa.s；
(4) it is coated with: slurry obtained in step (2) is coated on aluminium foil, coating surface density is 500g/m2, by step
(3) slurry obtained is coated on copper foil in, coated face density 115g/m2；
(5) film-making: being 75 μm thick by negative electrode tab pressure by positive plate pressure to be 150 μm thick；Then by banding machine fragment, then
By soldering polar ear on full-automatic pelleter, and tape；
(6) assemble: by automatic winding-machine by positive plate, the diaphragm of 11 μ m-thicks, negative electrode tab, 11 μ m-thicks membrane winding at
Diameter is the core of 17.0-17.5mm, is then charged into internal diameter as 17.8mm, in the steel shell of a height of 18.2mm, welds positive and negative anodes pole
It is toasted after ear, guarantees positive water content in 100ppm hereinafter, cathode can carry out fluid injection after 300ppm or less；
(7) fluid injection: in the glove box that humidity is less than -50 DEG C of dew point, 5.0 ± 0.5g electrolyte is injected, is vacuumized quiet
It sets after liquid to be electrolysed dries up and is sealed, be highly 18.0 ± 0.5mm after sealing.
(8) forming and capacity dividing: after 45 DEG C stand 48 hours, with 0.2C electric current charging 10min, then with 0.6C electric current charging 80
Minute, with 0.6C constant-current charge to 4.35V after standing 36 hours, then with 0.6C electric current constant-current discharge to 2.5V, recording capacity.
Embodiment 2
A kind of 18650 battery cores of high-energy density, including shell, positive plate, negative electrode tab, diaphragm and electrolyte.
The collector of the positive plate is aluminium foil, and positive active material is nickle cobalt lithium manganate 811.Leading on the positive plate
Electric agent is carbon nanotube, and binder is Kynoar.Dispersing agent on the positive plate is relative molecular mass in 10000-
16000, sulfonation degree is the condensation product sodium salt of the naphthalenesulfonateformaldehyde formaldehyde of 70-100%.
The collector of the negative electrode tab is copper foil, and negative electrode active material is silicon based composite material；Leading in the negative electrode tab
Electric agent is carbon nanotube, and the binder in the negative electrode tab is sodium alginate.
Wherein, the collector of the positive plate is with a thickness of 6 μm, the collector of the negative electrode tab with a thickness of 6 μm.The nickel
Gram volume of the cobalt manganic acid lithium 811 under 4.2V-2.5V voltage is 200mAh/g or more, and energy density is in 694wh/kg or more；Institute
Stating in silicon based composite material silicone content is 42wt%, content of graphite 58wt%, gram holding under silicon based composite material 4.2V-2.5V voltage
Amount is 650mAh/g or more, and energy density is in 2340wh/kg or more.
The solute of the electrolyte is lithium hexafluoro phosphate and di-oxalate lithium borate, and the solvent of electrolyte is fluoro ethylene carbonate
The mixture of ester and vinylene carbonate.The diaphragm is PE material.The diaphragm is equipped with coating, and the coating is that ceramics apply
Layer.
A kind of preparation method of 18650 battery cores of above-mentioned high-energy density, comprising the following steps:
(1) material prepares: preparing positive active material and conductive agent and carries out powder drying；
(2) anode homogenate: weighing following substance: positive active material 95% by weight percent, conductive agent 2.0%,
Binder is 2.5%, dispersing agent 0.5%；Above-mentioned raw materials are premixed with the speed of revolution 10Hz-15Hz, add N- first
Base pyrrolidones is adjusted to the slurry that viscosity is 7500 ± 1000Pa.s；
(3) cathode is homogenized: weigh following substance: negative electrode active material 94% by weight percent, binder 4.0%,
Conductive agent is 2.0%；Above-mentioned raw materials are premixed with the speed of revolution 10Hz-15Hz, deionized water is then added, is adjusted to glue
Degree is the slurry of 2500 ± 1000Pa.s；
(4) it is coated with: slurry obtained in step (2) is coated on aluminium foil, coating surface density is 490g/m2, by step
(3) slurry obtained is coated on copper foil in, coated face density 80g/m2；
(5) film-making: being 53 μm thick by negative electrode tab pressure by positive plate pressure to be 144 μm thick；Then by banding machine fragment, then
By soldering polar ear on full-automatic pelleter, and tape；
(6) assemble: by automatic winding-machine by positive plate, the diaphragm of 6 μ m-thicks, negative electrode tab, 6 μ m-thicks membrane winding Cheng Zhi
Diameter is the core of 17.0-17.5mm, is then charged into internal diameter as 17.8mm, in the steel shell of a height of 18.2mm, welds positive and negative anodes tab
After toasted, guarantee positive water content in 100ppm hereinafter, cathode can carry out fluid injection after 300ppm or less；
(7) fluid injection: in the glove box that humidity is less than -50 DEG C of dew point, 5.0 ± 0.5g electrolyte is injected, is vacuumized quiet
It sets after liquid to be electrolysed dries up and is sealed, be highly 18.0 ± 0.5mm after sealing.
(8) forming and capacity dividing: after 45 DEG C stand 48 hours, with 0.2C electric current charging 10min, then with 0.6C electric current charging 80
Minute, with 0.6C constant-current charge to 4.35V after standing 36 hours, then with 0.6C electric current constant-current discharge to 2.5V, recording capacity.
Embodiment 3
A kind of 18650 battery cores of high-energy density, including shell, positive plate, negative electrode tab, diaphragm and electrolyte.
The collector of the positive plate is aluminium foil, and positive active material is nickle cobalt lithium manganate 811.Leading on the positive plate
Electric agent is graphene conductive agent, and binder is Kynoar.Dispersing agent on the positive plate is that relative molecular mass exists
The condensation product sodium salt of 10000-16000, the naphthalenesulfonateformaldehyde formaldehyde that sulfonation degree is 70-100%.
The collector of the negative electrode tab is copper foil, and negative electrode active material is silicon based composite material；Leading in the negative electrode tab
Electric agent is graphene conductive agent.Binder in the negative electrode tab is sodium carboxymethylcellulose and sodium alginate.
Wherein, the collector of the positive plate is with a thickness of 12 μm, the collector of the negative electrode tab with a thickness of 10 μm.It is described
Gram volume of the nickle cobalt lithium manganate 811 under 4.2V-2.5V voltage is 200mAh/g or more, and energy density is in 694wh/kg or more；
Silicone content is 42wt%, content of graphite 58wt%, gram under silicon based composite material 4.2V-2.5V voltage in the silicon based composite material
Capacity is 650mAh/g or more, and energy density is in 2340wh/kg or more.
The solute of the electrolyte is lithium hexafluoro phosphate and di-oxalate lithium borate, and the solvent of electrolyte is succinic anhydride, fluorine
For the mixture of ethylene carbonate and vinylene carbonate.The diaphragm is PP material.The diaphragm is equipped with coating, the painting
Layer is ceramic coating.
A kind of preparation method of 18650 battery cores of above-mentioned high-energy density, comprising the following steps:
(1) material prepares: preparing positive active material and conductive agent and carries out powder drying；
(2) anode homogenate: weighing following substance: positive active material 98% by weight percent, conductive agent 0.5%,
Binder is 0.5%, dispersing agent 1.0%；Above-mentioned raw materials are premixed with the speed of revolution 10Hz-15Hz, add N- first
Base pyrrolidones is adjusted to the slurry that viscosity is 7500 ± 1000Pa.s；
(3) cathode is homogenized: weigh following substance by weight percent: negative electrode active material 97.7%, binder are
2.0%, conductive agent 0.3%；Above-mentioned raw materials are premixed with the speed of revolution 10Hz-15Hz, deionized water is then added, adjusts
The slurry for being 2500 ± 1000Pa.s to viscosity；
(4) it is coated with: slurry obtained in step (2) is coated on aluminium foil, coating surface density is 510g/m2, by step
(3) slurry obtained is coated on copper foil in, coated face density 150g/m2；
(5) film-making: being 98 μm thick by negative electrode tab pressure by positive plate pressure to be 156 μm thick；Then by banding machine fragment, then
By soldering polar ear on full-automatic pelleter, and tape；
(6) assemble: by automatic winding-machine by positive plate, the diaphragm of 16 μ m-thicks, negative electrode tab, 16 μ m-thicks membrane winding at
Diameter is the core of 17.0-17.5mm, is then charged into internal diameter as 17.8mm, in the steel shell of a height of 18.2mm, welds positive and negative anodes pole
It is toasted after ear, guarantees positive water content in 100ppm hereinafter, cathode can carry out fluid injection after 300ppm or less；
(7) fluid injection: in the glove box that humidity is less than -50 DEG C of dew point, 5.0 ± 0.5g electrolyte is injected, is vacuumized quiet
It sets after liquid to be electrolysed dries up and is sealed, be highly 18.0 ± 0.5mm after sealing.
(8) forming and capacity dividing: after 45 DEG C stand 48 hours, with 0.2C electric current charging 10min, then with 0.6C electric current charging 80
Minute, with 0.6C constant-current charge to 4.35V after standing 36 hours, then with 0.6C electric current constant-current discharge to 2.5V, recording capacity.
Embodiment 4
A kind of 18650 battery cores of high-energy density, including shell, positive plate, negative electrode tab, diaphragm and electrolyte.
The collector of the positive plate is aluminium foil, and positive active material is nickle cobalt lithium manganate 811.Leading on the positive plate
Electric agent is carbon nanotube, and binder is Kynoar.Dispersing agent on the positive plate is relative molecular mass in 10000-
16000, sulfonation degree is the condensation product sodium salt of the naphthalenesulfonateformaldehyde formaldehyde of 70-100%.
The collector of the negative electrode tab is copper foil, and negative electrode active material is silicon based composite material；It is viscous in the negative electrode tab
Tying agent is sodium carboxymethylcellulose and sodium alginate.
Wherein, the collector of the positive plate is with a thickness of 6-12 μm, the collector of the negative electrode tab with a thickness of 6-10 μm.
Gram volume of the nickle cobalt lithium manganate 811 under 4.2V-2.5V voltage be 200mAh/g or more, energy density 694wh/kg with
On；Silicone content is 42wt%, content of graphite 58wt% in the silicon based composite material, under silicon based composite material 4.2V-2.5V voltage
Gram volume be 650mAh/g or more, energy density is in 2340wh/kg or more.
The solute of the electrolyte is lithium hexafluoro phosphate and di-oxalate lithium borate, and the solvent of electrolyte is succinic anhydride and carbon
The mixture of sour vinylene.The diaphragm is PP material.The diaphragm is equipped with coating, and the coating is ceramic coating.
A kind of preparation method of 18650 battery cores of above-mentioned high-energy density, comprising the following steps:
(1) material prepares: preparing positive active material and conductive agent and carries out powder drying；
(2) anode homogenate: weighing following substance: positive active material 96% by weight percent, and conductive agent 1% glues
Tying agent is 2%, dispersing agent 1%；Above-mentioned raw materials are premixed with the speed of revolution 10Hz-15Hz, add N- methylpyrrole
Alkanone is adjusted to the slurry that viscosity is 7500 ± 1000Pa.s；
(3) cathode is homogenized: weighing following substance: negative electrode active material 95% by weight percent, binder 4% is led
Electric agent is 1%；Above-mentioned raw materials are premixed with the speed of revolution 10Hz-15Hz, deionized water are then added, being adjusted to viscosity is
The slurry of 2500 ± 1000Pa.s；
(4) it is coated with: slurry obtained in step (2) is coated on aluminium foil, coating surface density is 500g/m2, by step
(3) slurry obtained is coated on copper foil in, coated face density 100g/m2；
(5) film-making: being 75 μm thick by negative electrode tab pressure by positive plate pressure to be 150 μm thick；Then by banding machine fragment, then
By soldering polar ear on full-automatic pelleter, and tape；
(6) assemble: by automatic winding-machine by positive plate, the diaphragm of 8 μ m-thicks, negative electrode tab, 8 μ m-thicks membrane winding Cheng Zhi
Diameter is the core of 17.0-17.5mm, is then charged into internal diameter as 17.8mm, in the steel shell of a height of 18.2mm, welds positive and negative anodes tab
After toasted, guarantee positive water content in 100ppm hereinafter, cathode can carry out fluid injection after 300ppm or less；
(7) fluid injection: in the glove box that humidity is less than -50 DEG C of dew point, 5.0 ± 0.5g electrolyte is injected, is vacuumized quiet
It sets after liquid to be electrolysed dries up and is sealed, be highly 18.0 ± 0.5mm after sealing.
(8) forming and capacity dividing: after 45 DEG C stand 48 hours, with 0.2C electric current charging 10min, then with 0.6C electric current charging 80
Minute, with 0.6C constant-current charge to 4.35V after standing 36 hours, then with 0.6C electric current constant-current discharge to 2.5V, recording capacity.
Embodiment 5
A kind of 18650 battery cores of high-energy density, including shell, positive plate, negative electrode tab, diaphragm and electrolyte.
The collector of the positive plate is aluminium foil, and positive active material is nickle cobalt lithium manganate 811.Leading on the positive plate
Electric agent is carbon nanotube and graphene conductive agent composition, and binder is Kynoar.Dispersing agent on the positive plate is
Relative molecular mass is in 10000-16000, the condensation product sodium salt for the naphthalenesulfonateformaldehyde formaldehyde that sulfonation degree is 70-100%.
The collector of the negative electrode tab is copper foil, and negative electrode active material is silicon based composite material；Leading on the positive plate
Electric agent is carbon nanotube and graphene conductive agent composition.Binder in the negative electrode tab is sodium carboxymethylcellulose and seaweed
Sour sodium.
Wherein, the collector of the positive plate is with a thickness of 9 μm, the collector of the negative electrode tab with a thickness of 8 μm.
Gram volume of the nickle cobalt lithium manganate 811 under 4.2V-2.5V voltage is 200mAh/g or more, and energy density exists
694wh/kg or more；The silicon based composite material uses Shenzhen City Beiterui New Energy Materials Co., Ltd model s650
The cathode of model, the gram volume under silicon based composite material 4.2V-2.5V voltage is 650mAh/g or more, and energy density exists
2340wh/kg or more.
The solute of the electrolyte is lithium hexafluoro phosphate and di-oxalate lithium borate, and the solvent of electrolyte is fluoro ethylene carbonate
The mixture of ester and vinylene carbonate.The diaphragm is PP material.The diaphragm is equipped with coating, and the coating is that ceramics apply
Layer.
A kind of preparation method of 18650 battery cores of above-mentioned high-energy density, comprising the following steps:
(1) material prepares: preparing positive active material and conductive agent and carries out powder drying；
(2) anode homogenate: weighing following substance: positive active material 98% by weight percent, conductive agent 0.5%,
Binder is 0.5%, dispersing agent 1.0%；Above-mentioned raw materials are premixed with the speed of revolution 10Hz-15Hz, add N- first
Base pyrrolidones is adjusted to the slurry that viscosity is 7500 ± 1000Pa.s；
(3) cathode is homogenized: weighing following substance: negative electrode active material 96% by weight percent, binder 2% is led
Electric agent is 2%；Above-mentioned raw materials are premixed with the speed of revolution 10Hz-15Hz, deionized water are then added, being adjusted to viscosity is
The slurry of 2500 ± 1000Pa.s；
(4) it is coated with: slurry obtained in step (2) is coated on aluminium foil, coating surface density is 490-510g/m2, will
Slurry obtained is coated on copper foil in step (3), coated face density 80-150g/m2；
(5) film-making: being 98 μm thick by negative electrode tab pressure by positive plate pressure to be 150 μm thick；Then by banding machine fragment, then
By soldering polar ear on full-automatic pelleter, and tape；
(6) assemble: by automatic winding-machine by positive plate, the diaphragm of 12 μ m-thicks, negative electrode tab, 12 μ m-thicks membrane winding at
Diameter is the core of 17.0-17.5mm, is then charged into internal diameter as 17.8mm, in the steel shell of a height of 18.2mm, welds positive and negative anodes pole
It is toasted after ear, guarantees positive water content in 100ppm hereinafter, cathode can carry out fluid injection after 300ppm or less；
(7) fluid injection: in the glove box that humidity is less than -50 DEG C of dew point, 5.0 ± 0.5g electrolyte is injected, is vacuumized quiet
It sets after liquid to be electrolysed dries up and is sealed, be highly 18.0 ± 0.5mm after sealing.
(8) forming and capacity dividing: after 45 DEG C stand 48 hours, with 0.2C electric current charging 10min, then with 0.6C electric current charging 80
Minute, with 0.6C constant-current charge to 4.35V after standing 36 hours, then with 0.6C electric current constant-current discharge to 2.5V, recording capacity.
Raw materials used in the present invention, equipment is unless otherwise noted the common raw material, equipment of this field；In the present invention
Method therefor is unless otherwise noted the conventional method of this field.
The above is only presently preferred embodiments of the present invention, is not intended to limit the invention in any way, it is all according to the present invention
Technical spirit any simple modification, change and equivalent transformation to the above embodiments, still fall within the technology of the present invention side
The protection scope of case.
Claims (4)
1. a kind of 18650 battery cores of high-energy density, including shell, positive plate, negative electrode tab, diaphragm and electrolyte；Its feature exists
In: the collector of the positive plate is aluminium foil, and positive active material is nickle cobalt lithium manganate 811；The collector of the negative electrode tab is
Copper foil, negative electrode active material are silicon based composite material；The diaphragm is PP or PE material；The solute of the electrolyte is hexafluoro phosphorus
Sour lithium and di-oxalate lithium borate, the solvent of electrolyte are the mixture of succinic anhydride and vinylene carbonate；
Dispersing agent on the positive plate is condensation product sodium of the relative molecular mass in the naphthalenesulfonateformaldehyde formaldehyde of 10000-16000
Salt, and the sulfonation degree of the condensation product sodium salt of naphthalenesulfonateformaldehyde formaldehyde is 70-100%；Binder in the negative electrode tab is alginic acid
Sodium；The diaphragm is equipped with coating, and the coating is polyvinylidene fluoride coating；
The preparation method of 18650 battery cores of the high-energy density, comprising the following steps:
(1) material prepares: preparing positive active material and conductive agent and carries out powder drying；
(2) anode homogenate: following substance: positive active material 95%-98%, conductive agent 0.5%- are weighed by weight percent
2.0%, binder 0.5%-2.5%, dispersing agent 0.5%-1.0%；Above-mentioned raw materials are carried out with the speed of revolution 10Hz-15Hz
Premix, adds N-Methyl pyrrolidone, is adjusted to the slurry that viscosity is 7500 ± 1000Pa.s；
(3) cathode is homogenized: weigh following substance by weight percent: negative electrode active material 94%-97.7%, binder are
2.0%-4.0%, conductive agent 0.3%-2.0%；Above-mentioned raw materials are premixed with the speed of revolution 10Hz-15Hz, are then added
Deionized water is adjusted to the slurry that viscosity is 2500 ± 1000Pa.s；
(4) it is coated with: slurry obtained in step (2) is coated on aluminium foil, coating surface density is 490-510g/m2, by step
(3) slurry obtained is coated on copper foil in, coated face density 80-150g/m2；
(5) film-making: being 53 μm -98 μm thick by negative electrode tab pressure by positive plate pressure to be 144 μm -156 μm thick；Then by banding machine point
Piece then by soldering polar ear on full-automatic pelleter, and is taped；
(6) assemble: by automatic winding-machine by positive plate, the diaphragm of 6-16 μ m-thick, negative electrode tab, 6-16 μ m-thick membrane winding at
Diameter is the core of 17.0-17.5mm, is then charged into internal diameter as 17.8mm, in the steel shell of a height of 18.2mm, welds positive and negative anodes pole
It is toasted after ear, guarantees positive water content in 100ppm hereinafter, cathode can carry out fluid injection after 300ppm or less；
(7) fluid injection: being to inject 5.0 ± 0.5g electrolyte in glove box less than -50 DEG C of dew point in humidity, vacuumize standing to
It is sealed after electrolyte dry-out, is highly 18.0 ± 0.5mm after sealing；
(8) forming and capacity dividing: after 45 DEG C stand 48 hours, with 0.2C electric current charging 10min, then with 80 points of 0.6C electric current charging
Clock, with 0.6C constant-current charge to 4.35V after standing 36 hours, then with 0.6C electric current constant-current discharge to 2.5V, recording capacity.
2. a kind of 18650 battery cores of high-energy density as described in claim 1, which is characterized in that the positive plate, negative electrode tab
On conductive agent be superp Li, carbon nanotube, it is one or several kinds of in graphene conductive agent, the binder on positive plate is
Kynoar.
3. a kind of 18650 battery cores of high-energy density as described in claim 1, which is characterized in that the afflux of the positive plate
Body thickness be 6-12 μm, the collector of the negative electrode tab with a thickness of 6-10 μm.
4. a kind of 18650 battery cores of high-energy density as described in claim 1, which is characterized in that the nickle cobalt lithium manganate 811
Gram volume under 4.2V-2.5V voltage is 200mAh/g or more, and energy density is in 694wh/kg or more；The silicon substrate composite wood
Silicone content is 42wt%, content of graphite 58wt% in material, and the gram volume under silicon based composite material 4.2V-2.5V voltage is 650mAh/g
More than, energy density is in 2340wh/kg or more.
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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 |
| CN109103448B (en) * | 2018-07-13 | 2021-01-05 | 金川集团股份有限公司 | High-capacity cylindrical flexible package lithium ion battery and manufacturing method thereof |
| CN115188922B (en) * | 2022-06-24 | 2024-06-18 | 江苏正力新能电池技术有限公司 | Silicon-based negative electrode plate, secondary battery containing same and power utilization device |
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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 |
| 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 |
| CN104900916A (en) * | 2015-06-26 | 2015-09-09 | 广州天赐高新材料股份有限公司 | Electrolyte solution for high-capacity lithium-ion battery, preparation method and lithium-ion battery |
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| 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 |
| 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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