CN111326727A - Multi-component silicon-oxygen negative electrode material for lithium ion battery and preparation method thereof - Google Patents
Multi-component silicon-oxygen negative electrode material for lithium ion battery and preparation method thereof Download PDFInfo
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- CN111326727A CN111326727A CN202010156232.1A CN202010156232A CN111326727A CN 111326727 A CN111326727 A CN 111326727A CN 202010156232 A CN202010156232 A CN 202010156232A CN 111326727 A CN111326727 A CN 111326727A
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- Prior art keywords
- lithium ion
- negative electrode
- silicon
- electrode material
- powder
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 41
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 41
- 239000007773 negative electrode material Substances 0.000 title claims abstract description 39
- OBNDGIHQAIXEAO-UHFFFAOYSA-N [O].[Si] Chemical compound [O].[Si] OBNDGIHQAIXEAO-UHFFFAOYSA-N 0.000 title claims abstract description 28
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 39
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 35
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 25
- 239000000463 material Substances 0.000 claims abstract description 25
- 239000002245 particle Substances 0.000 claims abstract description 19
- 239000007784 solid electrolyte Substances 0.000 claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 17
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 15
- 229910052726 zirconium Inorganic materials 0.000 claims abstract description 13
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 12
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 11
- 239000011258 core-shell material Substances 0.000 claims abstract description 7
- 238000004519 manufacturing process Methods 0.000 claims abstract description 6
- 239000000843 powder Substances 0.000 claims description 69
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 35
- 239000000203 mixture Substances 0.000 claims description 31
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Chemical compound [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 claims description 28
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 24
- 238000010438 heat treatment Methods 0.000 claims description 23
- 238000001816 cooling Methods 0.000 claims description 19
- 238000002156 mixing Methods 0.000 claims description 16
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 12
- 239000011247 coating layer Substances 0.000 claims description 11
- 229910052698 phosphorus Inorganic materials 0.000 claims description 11
- 239000010406 cathode material Substances 0.000 claims description 8
- IDBFBDSKYCUNPW-UHFFFAOYSA-N lithium nitride Chemical compound [Li]N([Li])[Li] IDBFBDSKYCUNPW-UHFFFAOYSA-N 0.000 claims description 8
- 238000012216 screening Methods 0.000 claims description 8
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 claims description 6
- 239000012298 atmosphere Substances 0.000 claims description 6
- 239000002131 composite material Substances 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 6
- 230000001590 oxidative effect Effects 0.000 claims description 6
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 5
- 239000011248 coating agent Substances 0.000 claims description 5
- 239000007791 liquid phase Substances 0.000 claims description 5
- 239000001301 oxygen Substances 0.000 claims description 5
- 239000011574 phosphorus Substances 0.000 claims description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 239000002994 raw material Substances 0.000 claims description 4
- 239000007790 solid phase Substances 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 3
- 239000010416 ion conductor Substances 0.000 claims description 3
- 230000000737 periodic effect Effects 0.000 claims description 3
- 238000004321 preservation Methods 0.000 claims description 3
- 239000013078 crystal Substances 0.000 claims 1
- 238000006243 chemical reaction Methods 0.000 abstract description 6
- 239000012528 membrane Substances 0.000 abstract description 4
- 238000007599 discharging Methods 0.000 abstract description 3
- 239000011244 liquid electrolyte Substances 0.000 abstract description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 16
- 239000012300 argon atmosphere Substances 0.000 description 10
- 229910052786 argon Inorganic materials 0.000 description 8
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 7
- 239000010703 silicon Substances 0.000 description 7
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 6
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 6
- 229910019142 PO4 Inorganic materials 0.000 description 6
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- 239000006185 dispersion Substances 0.000 description 6
- 239000000377 silicon dioxide Substances 0.000 description 6
- 238000003756 stirring Methods 0.000 description 6
- SNKMVYBWZDHJHE-UHFFFAOYSA-M lithium;dihydrogen phosphate Chemical compound [Li+].OP(O)([O-])=O SNKMVYBWZDHJHE-UHFFFAOYSA-M 0.000 description 5
- 239000002904 solvent Substances 0.000 description 5
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 4
- RGPUVZXXZFNFBF-UHFFFAOYSA-K diphosphonooxyalumanyl dihydrogen phosphate Chemical compound [Al+3].OP(O)([O-])=O.OP(O)([O-])=O.OP(O)([O-])=O RGPUVZXXZFNFBF-UHFFFAOYSA-K 0.000 description 4
- 239000003792 electrolyte Substances 0.000 description 4
- 239000003960 organic solvent Substances 0.000 description 4
- -1 polyethylene Polymers 0.000 description 4
- IVORCBKUUYGUOL-UHFFFAOYSA-N 1-ethynyl-2,4-dimethoxybenzene Chemical compound COC1=CC=C(C#C)C(OC)=C1 IVORCBKUUYGUOL-UHFFFAOYSA-N 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 3
- WMFOQBRAJBCJND-UHFFFAOYSA-M Lithium hydroxide Chemical compound [Li+].[OH-] WMFOQBRAJBCJND-UHFFFAOYSA-M 0.000 description 3
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 3
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 3
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 238000001704 evaporation Methods 0.000 description 3
- 239000010439 graphite Substances 0.000 description 3
- 229910002804 graphite Inorganic materials 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- XIXADJRWDQXREU-UHFFFAOYSA-M lithium acetate Chemical compound [Li+].CC([O-])=O XIXADJRWDQXREU-UHFFFAOYSA-M 0.000 description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 3
- TVCBSVKTTHLKQC-UHFFFAOYSA-M propanoate;zirconium(4+) Chemical compound [Zr+4].CCC([O-])=O TVCBSVKTTHLKQC-UHFFFAOYSA-M 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 229910000166 zirconium phosphate Inorganic materials 0.000 description 3
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- 239000013543 active substance Substances 0.000 description 2
- SMZOGRDCAXLAAR-UHFFFAOYSA-N aluminium isopropoxide Chemical compound [Al+3].CC(C)[O-].CC(C)[O-].CC(C)[O-] SMZOGRDCAXLAAR-UHFFFAOYSA-N 0.000 description 2
- JPUHCPXFQIXLMW-UHFFFAOYSA-N aluminium triethoxide Chemical compound CCO[Al](OCC)OCC JPUHCPXFQIXLMW-UHFFFAOYSA-N 0.000 description 2
- LFVGISIMTYGQHF-UHFFFAOYSA-N ammonium dihydrogen phosphate Chemical compound [NH4+].OP(O)([O-])=O LFVGISIMTYGQHF-UHFFFAOYSA-N 0.000 description 2
- 229910000387 ammonium dihydrogen phosphate Inorganic materials 0.000 description 2
- 239000010426 asphalt Substances 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 239000006258 conductive agent Substances 0.000 description 2
- QOKYJGZIKILTCY-UHFFFAOYSA-J hydrogen phosphate;zirconium(4+) Chemical compound [Zr+4].OP([O-])([O-])=O.OP([O-])([O-])=O QOKYJGZIKILTCY-UHFFFAOYSA-J 0.000 description 2
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 description 2
- 229910052808 lithium carbonate Inorganic materials 0.000 description 2
- 229910001386 lithium phosphate Inorganic materials 0.000 description 2
- 235000019837 monoammonium phosphate Nutrition 0.000 description 2
- 239000007774 positive electrode material Substances 0.000 description 2
- 239000002153 silicon-carbon composite material Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- TWQULNDIKKJZPH-UHFFFAOYSA-K trilithium;phosphate Chemical compound [Li+].[Li+].[Li+].[O-]P([O-])([O-])=O TWQULNDIKKJZPH-UHFFFAOYSA-K 0.000 description 2
- ZFQCFWRSIBGRFL-UHFFFAOYSA-B 2-hydroxypropane-1,2,3-tricarboxylate;zirconium(4+) Chemical compound [Zr+4].[Zr+4].[Zr+4].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O.[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O.[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O.[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O ZFQCFWRSIBGRFL-UHFFFAOYSA-B 0.000 description 1
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 1
- DUFCMRCMPHIFTR-UHFFFAOYSA-N 5-(dimethylsulfamoyl)-2-methylfuran-3-carboxylic acid Chemical compound CN(C)S(=O)(=O)C1=CC(C(O)=O)=C(C)O1 DUFCMRCMPHIFTR-UHFFFAOYSA-N 0.000 description 1
- ZUGAOYSWHHGDJY-UHFFFAOYSA-K 5-hydroxy-2,8,9-trioxa-1-aluminabicyclo[3.3.2]decane-3,7,10-trione Chemical compound [Al+3].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O ZUGAOYSWHHGDJY-UHFFFAOYSA-K 0.000 description 1
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 description 1
- IMQLKJBTEOYOSI-GPIVLXJGSA-N Inositol-hexakisphosphate Chemical compound OP(O)(=O)O[C@H]1[C@H](OP(O)(O)=O)[C@@H](OP(O)(O)=O)[C@H](OP(O)(O)=O)[C@H](OP(O)(O)=O)[C@@H]1OP(O)(O)=O IMQLKJBTEOYOSI-GPIVLXJGSA-N 0.000 description 1
- 229910001290 LiPF6 Inorganic materials 0.000 description 1
- 229910014604 LixSiOy Inorganic materials 0.000 description 1
- UEZVMMHDMIWARA-UHFFFAOYSA-N Metaphosphoric acid Chemical compound OP(=O)=O UEZVMMHDMIWARA-UHFFFAOYSA-N 0.000 description 1
- IMQLKJBTEOYOSI-UHFFFAOYSA-N Phytic acid Natural products OP(O)(=O)OC1C(OP(O)(O)=O)C(OP(O)(O)=O)C(OP(O)(O)=O)C(OP(O)(O)=O)C1OP(O)(O)=O IMQLKJBTEOYOSI-UHFFFAOYSA-N 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- CZMRCDWAGMRECN-UGDNZRGBSA-N Sucrose Chemical compound O[C@H]1[C@H](O)[C@@H](CO)O[C@@]1(CO)O[C@@H]1[C@H](O)[C@@H](O)[C@H](O)[C@@H](CO)O1 CZMRCDWAGMRECN-UGDNZRGBSA-N 0.000 description 1
- 229930006000 Sucrose Natural products 0.000 description 1
- NDZRILJASQYFSY-UHFFFAOYSA-J [Zr+4].OP(O)([O-])=O.OP(O)([O-])=O.OP(O)([O-])=O.OP(O)([O-])=O Chemical compound [Zr+4].OP(O)([O-])=O.OP(O)([O-])=O.OP(O)([O-])=O.OP(O)([O-])=O NDZRILJASQYFSY-UHFFFAOYSA-J 0.000 description 1
- 239000011149 active material Substances 0.000 description 1
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 1
- ILRRQNADMUWWFW-UHFFFAOYSA-K aluminium phosphate Chemical compound O1[Al]2OP1(=O)O2 ILRRQNADMUWWFW-UHFFFAOYSA-K 0.000 description 1
- 239000010405 anode material Substances 0.000 description 1
- 238000000498 ball milling Methods 0.000 description 1
- WQZGKKKJIJFFOK-VFUOTHLCSA-N beta-D-glucose Chemical compound OC[C@H]1O[C@@H](O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-VFUOTHLCSA-N 0.000 description 1
- BSDOQSMQCZQLDV-UHFFFAOYSA-N butan-1-olate;zirconium(4+) Chemical compound [Zr+4].CCCC[O-].CCCC[O-].CCCC[O-].CCCC[O-] BSDOQSMQCZQLDV-UHFFFAOYSA-N 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- MNNHAPBLZZVQHP-UHFFFAOYSA-N diammonium hydrogen phosphate Chemical compound [NH4+].[NH4+].OP([O-])([O-])=O MNNHAPBLZZVQHP-UHFFFAOYSA-N 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 description 1
- XPFVYQJUAUNWIW-UHFFFAOYSA-N furfuryl alcohol Chemical compound OCC1=CC=CO1 XPFVYQJUAUNWIW-UHFFFAOYSA-N 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000011245 gel electrolyte Substances 0.000 description 1
- 239000008103 glucose Substances 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- GNIFDFLNOVMXBN-UHFFFAOYSA-L hydrogen phosphate;zirconium(2+) Chemical compound [Zr+2].OP([O-])([O-])=O GNIFDFLNOVMXBN-UHFFFAOYSA-L 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000002354 inductively-coupled plasma atomic emission spectroscopy Methods 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 229940071264 lithium citrate Drugs 0.000 description 1
- WJSIUCDMWSDDCE-UHFFFAOYSA-K lithium citrate (anhydrous) Chemical compound [Li+].[Li+].[Li+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O WJSIUCDMWSDDCE-UHFFFAOYSA-K 0.000 description 1
- XKPJKVVZOOEMPK-UHFFFAOYSA-M lithium;formate Chemical compound [Li+].[O-]C=O XKPJKVVZOOEMPK-UHFFFAOYSA-M 0.000 description 1
- AXMOZGKEVIBBCF-UHFFFAOYSA-M lithium;propanoate Chemical compound [Li+].CCC([O-])=O AXMOZGKEVIBBCF-UHFFFAOYSA-M 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- YQCIWBXEVYWRCW-UHFFFAOYSA-N methane;sulfane Chemical compound C.S YQCIWBXEVYWRCW-UHFFFAOYSA-N 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011255 nonaqueous electrolyte Substances 0.000 description 1
- 125000004430 oxygen atom Chemical group O* 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 229920001568 phenolic resin Polymers 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 239000000467 phytic acid Substances 0.000 description 1
- 235000002949 phytic acid Nutrition 0.000 description 1
- 229940068041 phytic acid Drugs 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000137 polyphosphoric acid Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000010532 solid phase synthesis reaction Methods 0.000 description 1
- 239000011232 storage material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000005720 sucrose Substances 0.000 description 1
- OBROYCQXICMORW-UHFFFAOYSA-N tripropoxyalumane Chemical compound [Al+3].CCC[O-].CCC[O-].CCC[O-] OBROYCQXICMORW-UHFFFAOYSA-N 0.000 description 1
- XJUNLJFOHNHSAR-UHFFFAOYSA-J zirconium(4+);dicarbonate Chemical compound [Zr+4].[O-]C([O-])=O.[O-]C([O-])=O XJUNLJFOHNHSAR-UHFFFAOYSA-J 0.000 description 1
- OEERILNPOAIBKF-UHFFFAOYSA-J zirconium(4+);tetraformate Chemical compound [Zr+4].[O-]C=O.[O-]C=O.[O-]C=O.[O-]C=O OEERILNPOAIBKF-UHFFFAOYSA-J 0.000 description 1
- LEHFSLREWWMLPU-UHFFFAOYSA-B zirconium(4+);tetraphosphate Chemical compound [Zr+4].[Zr+4].[Zr+4].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O LEHFSLREWWMLPU-UHFFFAOYSA-B 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/362—Composites
- H01M4/366—Composites as layered products
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—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
- H01M4/483—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides for non-aqueous cells
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
- H01M4/583—Carbonaceous material, e.g. graphite-intercalation compounds or CFx
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
- H01M2004/027—Negative electrodes
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
A lithium ion battery uses multielement silicon oxygen negative pole material and its preparation method, relate to the new material technical field, the negative pole material of the invention contains Si, O, Li, C, Al, Zr, seven kinds of elements of P, include a plurality of particle units in the negative pole material, every particle unit is the core-shell structure, the invention is according to the working principle of the lithium ion secondary battery, the process of the invalid lithium material of consumption of negative pole material after making up the battery is advanced to and given and finished in advance in the material manufacturing process, thus reach the first efficient long cycle life demand characteristic of negative pole material, reduce the invalid amount of lithium consumption while charging and discharging after making up the battery at the same time; by forming the lithium ion solid electrolyte membrane on the surface of the negative electrode material particles in advance, the reaction of the negative electrode material and the liquid electrolyte to generate the solid electrolyte after the battery is manufactured is weakened, the lithium consumption for forming the solid electrolyte membrane due to the reaction is reduced, and the purposes of improving the first efficiency and prolonging the cycle life and the like can be finally realized.
Description
Technical Field
The invention relates to the technical field of new materials, in particular to a multielement silica negative electrode material and a preparation method thereof, and particularly relates to a multielement silica negative electrode material for a lithium ion battery and a preparation method thereof.
Background
It is known that as portable electric appliances such as mobile phones, notebook computers, tablet computers, etc. are rapidly popularized, the market demand for rechargeable batteries with high energy density is also increased, and thus the demand for lithium ion secondary batteries is explosively increased. Meanwhile, with the rapid development of electric vehicles, especially electric automobiles in recent years, the demand for lithium ion secondary batteries has further increased. In practical applications, the application end requires that the lithium ion secondary battery has the characteristics of high energy density, long cycle life and the like.
The energy density of a lithium ion secondary battery is directly related to the lithium storage capacity of the positive electrode material and the negative electrode material. Taking the negative electrode material as an example, the negative electrode material is usually graphite, the theoretical energy density of the graphite is 372mAh/g, the current development and application are mature, and the requirements of market application ends are difficult to meet. The necessity and urgency for the development of higher capacity anode materials are particularly prominent.
It was found that silicon can also be used as a negative electrode active material, and the theoretical energy density was 4200 mAh/g. The silicon has large lithium storage capacity, large volume expansion and contraction change during charge and discharge cycles, and easy pulverization. Silicon reacts with electrolyte during charge and discharge cycles, resulting in electrolyte consumption, low cycle life of the battery, and the like.
The silicon monoxide is also a negative electrode active substance, the theoretical energy density of the silicon monoxide reaches 2000mAh/g, is lower than that of simple substance silicon, the volume expansion and shrinkage change is reduced during corresponding charge-discharge circulation, the reaction active liquid with the electrolyte is reduced, the cycle life is prolonged, and the silicon monoxide is a lithium ion secondary battery negative electrode material with practical prospect. As a negative electrode lithium storage material, during charging and discharging of a battery, lithium coming from a positive electrode material penetrates through the surface and enters into the interior of the silicon protoxide, only a part of the lithium can return to the positive electrode to play a role in circulation, and the rest part of the lithium is respectively consumed on the surface and the interior of the silicon protoxide, so that the first charging and discharging efficiency of the battery is low, and the problem which needs to be solved by application is solved.
Through search, Chinese patent, patent application number is: 97120801.8, publication number: CN1188335A, filed as follows: on the day 28 of 11/1997, the patent names: a non-aqueous electrolyte secondary battery and a method for manufacturing the same, which are primarily improved by introducing lithium into silicon oxide at a material preparation stage to form a lithium-containing silicon oxide expressed as LixSiOy (0< x,0< y <2) c. Chinese patent, patent application number is: 02112180.X, publication no: CN1402366A, filed as follows: day 21, 06/2002, with patent names: the silicon-carbon composite material with high specific capacity for the lithium ion battery negative electrode and the preparation method thereof realize the coating of a layer of carbon on the surface of negative electrode active materials such as silicon monoxide and the like by a method of compounding the silicon-carbon composite material with a carbon material, and further improve the performance. Although the industry's efforts to improve have continued, the problems affecting the utility of the material still remain, the first time the efficiency is low and the cycle life is not long enough.
Therefore, how to provide a multi-component silicon-oxygen negative electrode material for a lithium ion battery and a preparation method thereof becomes a long-term technical demand of the technical personnel in the field.
Disclosure of Invention
The invention provides a multi-element silicon-oxygen cathode material for a lithium ion battery and a preparation method thereof, aiming at overcoming the defects in the background technology.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the multielement silica negative electrode material for the lithium ion battery comprises the following components in percentage by weight:
the multi-component silica negative electrode material for the lithium ion battery comprises a plurality of particle units, and each particle unit is of a core-shell structure.
The multi-element silicon-oxygen negative electrode material for the lithium ion battery is a crystalline and amorphous mixed structure formed by four elements including Si, O, Li and C in a core part of each particle unit, and an amorphous structure mixture formed by O, Li, C, Al, Zr and P in a core part of each particle unit.
The core-shell part of the multi-element silicon-oxygen negative electrode material for the lithium ion battery is a composite shell which is mainly composed of a solid electrolyte LiaAlbZrc (PO4)3(6< a +2b +4C <12) formed by O, Li, Al, Zr and P elements and mainly composed of electron-conductive C and ion-conductive solid electrolyte.
The Zr element can be completely or partially replaced by the same group elements in the periodic table.
A preparation method of a multi-element silicon-oxygen negative electrode material for a lithium ion battery specifically comprises the following steps:
firstly, adopting silicon monoxide powder with a carbon coating layer on the surface, uniformly mixing the silicon monoxide powder with lithium source powder under the protection of a non-oxidizing atmosphere, heating the mixed material to 350-750 ℃, preserving heat for 2-24 hours, and cooling to room temperature to obtain base powder;
step two, uniformly mixing and drying the basic powder obtained in the step one with a solid electrolyte LiaAlbZrc (PO4)3(6< a +2b +4c <12) material by a solid phase or liquid phase mixing method, heating to 100-700 ℃ under the condition of non-oxidizing atmosphere, carrying out heat preservation treatment for 1-6 hours, and cooling to room temperature to obtain target powder;
and thirdly, scattering, removing impurities and screening the target powder obtained in the last step to obtain the required multielement silicon-oxygen cathode material.
According to the preparation method of the multi-element silicon-oxygen cathode material for the lithium ion battery, the silicon oxide powder with the carbon coating layer on the surface is composite powder obtained by codeposition of silicon oxide and carbon or powder obtained by carbon coating after the silicon oxide powder is prepared.
According to the preparation method of the multi-component silicon-oxygen cathode material for the lithium ion battery, the particle size of the silicon monoxide powder with the carbon coating layer on the surface is 1-20 microns.
According to the preparation method of the multi-silicon-oxygen cathode material for the lithium ion battery, the lithium source powder is one or a mixture of two of Li3N or LiH.
In the preparation method of the multi-component silicon-oxygen negative electrode material for the lithium ion battery, the solid electrolyte LiaAlbZrc (PO4)3(6< a +2b +4c <12) material is a lithium ion conductor which is synthesized by reacting various raw materials respectively containing a lithium source, an aluminum source, a zirconium source, a phosphorus source and an oxygen source in the preparation process.
By adopting the technical scheme, the invention has the following advantages:
according to the invention, according to the working principle of the lithium ion secondary battery, the process of inefficiently consuming the lithium material by the negative electrode material after the battery is formed is advanced to be completed in advance in the material manufacturing process, so that the requirement characteristic of high efficiency and long cycle life of the negative electrode material for the first time is achieved; the lithium ion solid electrolyte membrane is formed on the surface of the negative electrode material particles in advance, so that the reaction of the negative electrode material and the liquid electrolyte to generate the solid electrolyte after the battery is manufactured is weakened, the lithium consumption for forming the solid electrolyte membrane due to the reaction is reduced, and the purposes of improving the first efficiency and the cycle life and the like can be realized finally.
Detailed Description
The present invention will be explained in more detail by the following examples, which are not intended to limit the invention;
the invention relates to a multi-component silica negative electrode material for a lithium ion battery, which comprises the following components in percentage by weight:
the multi-component silicon-oxygen negative electrode material comprises a plurality of particle units, and each particle unit is of a core-shell structure. The core part in each particle unit is a crystalline and amorphous mixed structure composed of four elements of Si, O, Li and C, and the core part in each particle unit is an amorphous structure mixture composed of O, Li, C, Al, Zr and P.
The core-shell part forms a solid electrolyte LiaAlbZrc (PO4)3(6< a +2b +4C <12) by O, Li, Al, Zr and P elements, and then is a composite shell mainly composed of electron-conductive C and ion-conductive solid electrolyte.
In specific implementation, the Zr element can be completely or partially replaced by the same group elements in the periodic table.
A preparation method of a multi-element silicon-oxygen negative electrode material for a lithium ion battery specifically comprises the following steps:
firstly, adopting silicon monoxide powder with a carbon coating layer on the surface, uniformly mixing the silicon monoxide powder with lithium source powder under the protection of a non-oxidizing atmosphere, heating the mixed material to 350-750 ℃, preserving heat for 2-24 hours, and cooling to room temperature to obtain base powder; wherein the silicon oxide powder with the carbon coating layer on the surface is composite powder obtained by codeposition of silicon oxide and carbon or powder obtained by carbon coating after the silicon oxide powder is prepared; the carbon source of the silicon monoxide powder with the carbon coating layer on the surface is any one or the combination of two or more of sucrose, glucose, citric acid, asphalt, furfuryl alcohol resin, phenolic resin, polyethylene, polystyrene, polypropylene, methane, propane and acetylene when the carbon is coated, and the method is not limited to a gas phase method, a liquid phase method or a solid phase method; further, the particle size of the silicon oxide powder with the carbon coating layer on the surface is 1-20 microns; in specific implementation, the granularity is preferably 1-10 microns, and is further preferably 3-8 microns; the lithium source powder is any one or a mixture of two of Li3N or LiH;
step two, uniformly mixing and drying the basic powder obtained in the step one with a solid electrolyte LiaAlbZrc (PO4)3(6< a +2b +4c <12) material by a solid phase or liquid phase mixing method, heating to 100-700 ℃ under the condition of non-oxidizing atmosphere, carrying out heat preservation treatment for 1-6 hours, and cooling to room temperature to obtain target powder; the solid electrolyte LiaAlbZrc (PO4)3(6< a +2b +4c <12) material is a lithium ion conductor which is synthesized by reacting various raw materials respectively containing a lithium source, an aluminum source, a zirconium source, a phosphorus source and an oxygen source in the manufacturing process;
and thirdly, scattering, removing impurities and screening the target powder obtained in the last step to obtain the required multielement silicon-oxygen cathode material.
In the practice of the present invention, the lithium source is any one or a combination of two or more of lithium formate, lithium acetate, lithium propionate, lithium citrate, lithium carbonate, lithium phosphate, lithium dihydrogen phosphate and lithium hydroxide.
Further, the aluminum source is any one or a combination of two or more of aluminum citrate, aluminum phosphate, aluminum monohydrogen phosphate, aluminum dihydrogen phosphate, aluminum ethoxide, aluminum propoxide, aluminum isopropoxide and aluminum hydroxide.
Further, the zirconium source is any one or a combination of two or more of zirconium formate, zirconium acetate, zirconium propionate, zirconium citrate, zirconium phosphate, zirconium monohydrogen phosphate, zirconium dihydrogen phosphate, zirconium carbonate, zirconium hydroxide and zirconium grease.
Further, the phosphorus source is any one or a combination of two or more of phosphoric acid, polyphosphoric acid, metaphosphoric acid, phytic acid, lithium phosphate, lithium dihydrogen phosphate, aluminum monohydrogen phosphate, aluminum dihydrogen phosphate, zirconium hydrogen phosphate, ammonium hydrogen phosphate and ammonium dihydrogen phosphate.
Further, the oxygen source is already included in lithium source, aluminum source, zirconium source, phosphorus source.
Further, the solid phase mixing means any one or a combination of two or more of fusion, mixing and milling, mechanical mixing, high-speed mechanical mixing and ball milling.
Further, the liquid phase mixing refers to a method of adding the raw materials into a liquid solvent to perform dispersion, mixing and reaction respectively. The liquid solvent is any one or a combination of two or more of organic solvents of ethanol, propanol, isopropanol, butanol, ethyl acetate and acetone.
The invention has the characteristics of good stability, high effective capacity, high first-time efficiency and good cycle performance.
The specific embodiment of the invention is as follows:
the invention adopts ICP-AES as an analysis means of material components and adopts a high-frequency induction carbon-sulfur analyzer as an analysis means of carbon content. The materials obtained in examples and comparative examples were used to fabricate button-type secondary batteries, and the use properties of the materials were evaluated.
First, a silicon monoxide powder having a carbon coating layer is prepared. Taking commercially available silica powder with the molar ratio of silicon to oxygen atoms of 1:1 and the granularity D50 of 6 microns, taking high-temperature petroleum asphalt powder as a carbon coating agent, mechanically mixing the two kinds of powder according to a proper proportion by using a high-speed mixer, putting the mixture into a vacuum heating furnace, heating to 800 ℃, preserving heat for 2 hours, cooling to room temperature, scattering and screening for later use. By adopting the method, three basic powders with carbon contents of 2.4%, 5.1% and 7.7% are respectively obtained.
Example 1
100g of basic powder with the carbon content of 2.4 percent and 10g of Li3N powder are taken and mixed evenly in an argon protection box; then placing the mixture in an argon atmosphere for heat treatment at 500 ℃ for 12h, and naturally cooling the mixture to room temperature. 1g of lithium dihydrogen phosphate, 1g of aluminum hydroxide and 1g of zirconium hydrogen phosphate are added into 100g of the powder, and the powder is uniformly fused by high-speed dispersion; and then placing the mixture in an argon atmosphere for heat treatment at 600 ℃ for 1h, naturally cooling the mixture to room temperature, and scattering and screening the mixture to obtain a finished product.
Example 2
100g of basic powder with the carbon content of 5.1 percent and 10g of LiH powder are taken and mixed evenly in an argon protection box; then placing the mixture in an argon atmosphere for heat treatment at 600 ℃ for 6h, and naturally cooling the mixture to room temperature. 1g of lithium dihydrogen phosphate, 1g of aluminum dihydrogen phosphate and 1g of zirconium hydroxide are added into 100g of the powder, and the powder is uniformly fused by high-speed dispersion; and then placing the mixture in an argon atmosphere for heat treatment at 550 ℃ for 2h, naturally cooling the mixture to room temperature, and scattering and screening the mixture to obtain a finished product.
Example 3
100g of basic powder with the carbon content of 7.7 percent and 20g of Li3N powder are taken and mixed evenly in an argon protection box; then placing the mixture in an argon atmosphere for heat treatment at 400 ℃ for 24 hours, and naturally cooling the mixture to room temperature. 1g of lithium carbonate, 1g of aluminum hydroxide, 1g of zirconium hydroxide and 3g of ammonium dihydrogen phosphate are added into 100g of the powder, and the powder is uniformly dispersed and fused at a high speed; and then placing the mixture in an argon atmosphere for heat treatment at 550 ℃ for 6 hours, naturally cooling the mixture to room temperature, and scattering and screening the mixture to obtain a finished product.
Example 4
100g of basic powder with the carbon content of 2.4 percent and 5g of LiH powder are taken and mixed evenly in an argon protection box; then placing the mixture in an argon atmosphere for heat treatment at 500 ℃ for 12h, and naturally cooling the mixture to room temperature. Adding 100g of organic solvent ethyl acetate into a stirring dispersion machine, then respectively adding 100g of the basic powder, 1g of lithium acetate, 1g of aluminum ethoxide, 1g of zirconium propionate and 3g of phosphoric acid, uniformly dispersing and stirring, heating to 100 ℃, evaporating and drying to remove the solvent, then carrying out heat treatment at 200 ℃ for 6 hours,
example 5
100g of basic powder with the carbon content of 5.1 percent and 13g of Li3N powder are taken and mixed evenly in an argon protection box; then placing the mixture in an argon atmosphere for heat treatment at 600 ℃ for 6h, and naturally cooling the mixture to room temperature. Adding 100g of isopropanol serving as an organic solvent into a stirring dispersion machine, then respectively adding 100g of the basic powder, 1g of lithium acetate, 1.5g of aluminum isopropoxide, 2g of butyl zirconate and 2g of phosphoric acid, uniformly dispersing and stirring, heating to 100 ℃, evaporating, drying and removing the solvent, then carrying out heat treatment at 400 ℃ for 4 hours, and cooling to obtain the required finished product.
Example 6
100g of basic powder with the carbon content of 7.7 percent and 20g of Li3N powder are taken and mixed evenly in an argon protection box; then placing the mixture in an argon atmosphere for heat treatment at 400 ℃ for 24 hours, and naturally cooling the mixture to room temperature. Adding 100g of organic solvent ethanol into a stirring dispersion machine, then respectively adding 100g of the basic powder, 1g of lithium dihydrogen phosphate, 1g of aluminum dihydrogen phosphate and 2g of zirconium propionate, uniformly dispersing and stirring, heating to 100 ℃, evaporating, drying to remove the solvent, then preserving heat at 200 ℃ for 6h, and cooling to obtain the required finished product.
Comparative example 1
The base powder with 5.1 percent of carbon content coated by carbon is directly used as a finished product.
Comparative example 2
100g of basic powder with the carbon content of 5.1 percent and 13g of Li3N powder are taken and mixed evenly in an argon protection box; and then placing the mixture in an argon atmosphere for heat treatment at 600 ℃ for 6h, naturally cooling the mixture to room temperature, and scattering and screening the mixture to obtain a finished product.
The samples of the finished products of examples and comparative examples were subjected to composition analysis, and the results are shown in the following table.
The lithium ion battery negative electrode materials prepared in the examples and the comparative examples are respectively used as active materials for manufacturing button batteries with metal lithium sheets as counter electrodes. The slurry adopts the proportion of active substances, conductive agents and binders in a ratio of 75:15:10, wherein the conductive agents are conductive carbon black SP and conductive graphite KS-6/SFG-6, and the binders are CMC + SBR. LiPF6/DEC + DMC + EC + FEC electrolyte and PE/PP diaphragm are adopted. The cell was made in an argon protective glove box, and the charge and discharge test was performed using a 0.005V-1.5V voltage with a 0.1C charge and discharge rate, and the test results are shown in the following table.
It can be seen from the results of battery tests of examples and comparative examples that the effective capacity, first efficiency and cycle performance of the battery were significantly improved by using the negative active material of the present invention.
The invention can be used for solid electrolyte batteries, gel electrolyte batteries and liquid electrolyte batteries.
The present invention is not described in detail in the prior art.
The embodiments selected for the purpose of disclosing the invention, are presently considered to be suitable, it being understood, however, that the invention is intended to cover all variations and modifications of the embodiments which fall within the spirit and scope of the invention.
Claims (10)
1. A multi-element silicon-oxygen cathode material for a lithium ion battery is characterized in that: the multielement silicon-oxygen negative electrode material comprises the following components in percentage by weight:
2. the multi-element silicon-oxygen negative electrode material for the lithium ion battery as claimed in claim 1, wherein: the multi-component silicon-oxygen negative electrode material comprises a plurality of particle units, and each particle unit is of a core-shell structure.
3. The multi-element silicon-oxygen negative electrode material for the lithium ion battery as claimed in claim 2, wherein: the core part in each particle unit is a crystal and amorphous mixed structure composed of four elements of Si, O, Li and C, and the core part in each particle unit is an amorphous mixed structure composed of O, Li, C, Al, Zr and P.
4. The multi-element silicon-oxygen negative electrode material for the lithium ion battery as claimed in claim 3, wherein: the core-shell part forms a solid electrolyte LiaAlbZrc (PO4)3(6< a +2b +4C <12) by O, Li, Al, Zr and P elements, and then is a composite shell mainly composed of electron-conductive C and ion-conductive solid electrolyte.
5. The multi-element silicon-oxygen negative electrode material for the lithium ion battery as claimed in claim 1, wherein: the Zr element may be replaced in whole or in part by the same group elements in the periodic Table.
6. The method for preparing the multi-element silicon-oxygen negative electrode material for the lithium ion battery according to any one of claims 1 to 5, which is characterized by comprising the following steps: the preparation method specifically comprises the following steps:
firstly, adopting silicon monoxide powder with a carbon coating layer on the surface, uniformly mixing the silicon monoxide powder with lithium source powder under the protection of a non-oxidizing atmosphere, heating the mixed material to 350-750 ℃, preserving heat for 2-24 hours, and cooling to room temperature to obtain base powder;
step two, uniformly mixing and drying the basic powder obtained in the step one with a solid electrolyte LiaAlbZrc (PO4)3(6< a +2b +4c <12) material by a solid phase or liquid phase mixing method, heating to 100-700 ℃ under the condition of non-oxidizing atmosphere, carrying out heat preservation treatment for 1-6 hours, and cooling to room temperature to obtain target powder;
and thirdly, scattering, removing impurities and screening the target powder obtained in the last step to obtain the required multielement silicon-oxygen cathode material.
7. The method for preparing the multi-element silicon-oxygen negative electrode material for the lithium ion battery as claimed in claim 6, which is characterized in that: the silicon oxide powder with the carbon coating layer on the surface is composite powder obtained by codeposition of silicon oxide and carbon or powder obtained by carbon coating after the silicon oxide powder is prepared.
8. The method for preparing the multi-element silicon-oxygen negative electrode material for the lithium ion battery as claimed in claim 6, which is characterized in that: the particle size of the silicon monoxide powder with the carbon coating layer on the surface is 1-20 microns.
9. The method for preparing the multi-element silicon-oxygen negative electrode material for the lithium ion battery as claimed in claim 6, which is characterized in that: the lithium source powder is any one or a mixture of Li3N or LiH.
10. The method for preparing the multi-element silicon-oxygen negative electrode material for the lithium ion battery as claimed in claim 6, which is characterized in that: the solid electrolyte LiaAlbZrc (PO4)3(6< a +2b +4c <12) material is a lithium ion conductor which is synthesized by reacting various raw materials respectively containing a lithium source, an aluminum source, a zirconium source, a phosphorus source and an oxygen source in the manufacturing process.
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Application publication date: 20200623 |