CN111875735A - Silane polymer for bonding lithium ion battery negative electrode and preparation method thereof - Google Patents
Silane polymer for bonding lithium ion battery negative electrode and preparation method thereof Download PDFInfo
- Publication number
- CN111875735A CN111875735A CN202010704269.3A CN202010704269A CN111875735A CN 111875735 A CN111875735 A CN 111875735A CN 202010704269 A CN202010704269 A CN 202010704269A CN 111875735 A CN111875735 A CN 111875735A
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- Prior art keywords
- silane
- gamma
- lithium ion
- ion battery
- methyl
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- 229910000077 silane Inorganic materials 0.000 title claims abstract description 140
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 title claims abstract description 124
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 92
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 92
- 229920000642 polymer Polymers 0.000 title claims abstract description 64
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 238000006243 chemical reaction Methods 0.000 claims abstract description 70
- 239000002904 solvent Substances 0.000 claims abstract description 65
- 239000007787 solid Substances 0.000 claims abstract description 61
- -1 ester compound Chemical class 0.000 claims abstract description 58
- 238000003756 stirring Methods 0.000 claims abstract description 57
- 239000003999 initiator Substances 0.000 claims abstract description 34
- 238000001035 drying Methods 0.000 claims abstract description 33
- 238000010438 heat treatment Methods 0.000 claims abstract description 32
- 238000001704 evaporation Methods 0.000 claims abstract description 30
- 238000000034 method Methods 0.000 claims abstract description 19
- 125000004185 ester group Chemical group 0.000 claims abstract description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 29
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 claims description 27
- OZAIFHULBGXAKX-UHFFFAOYSA-N 2-(2-cyanopropan-2-yldiazenyl)-2-methylpropanenitrile Chemical compound N#CC(C)(C)N=NC(C)(C)C#N OZAIFHULBGXAKX-UHFFFAOYSA-N 0.000 claims description 22
- 125000000217 alkyl group Chemical group 0.000 claims description 21
- 239000001257 hydrogen Substances 0.000 claims description 20
- 229910052739 hydrogen Inorganic materials 0.000 claims description 20
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 18
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims description 16
- DKPFZGUDAPQIHT-UHFFFAOYSA-N Butyl acetate Natural products CCCCOC(C)=O DKPFZGUDAPQIHT-UHFFFAOYSA-N 0.000 claims description 14
- FUZZWVXGSFPDMH-UHFFFAOYSA-N hexanoic acid Chemical compound CCCCCC(O)=O FUZZWVXGSFPDMH-UHFFFAOYSA-N 0.000 claims description 14
- 229910052799 carbon Inorganic materials 0.000 claims description 12
- OMPJBNCRMGITSC-UHFFFAOYSA-N Benzoylperoxide Chemical compound C=1C=CC=CC=1C(=O)OOC(=O)C1=CC=CC=C1 OMPJBNCRMGITSC-UHFFFAOYSA-N 0.000 claims description 10
- BAPJBEWLBFYGME-UHFFFAOYSA-N Methyl acrylate Chemical compound COC(=O)C=C BAPJBEWLBFYGME-UHFFFAOYSA-N 0.000 claims description 10
- 235000019400 benzoyl peroxide Nutrition 0.000 claims description 10
- ISXSCDLOGDJUNJ-UHFFFAOYSA-N tert-butyl prop-2-enoate Chemical compound CC(C)(C)OC(=O)C=C ISXSCDLOGDJUNJ-UHFFFAOYSA-N 0.000 claims description 9
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims description 8
- NMJJFJNHVMGPGM-UHFFFAOYSA-N butyl formate Chemical compound CCCCOC=O NMJJFJNHVMGPGM-UHFFFAOYSA-N 0.000 claims description 8
- 239000004342 Benzoyl peroxide Substances 0.000 claims description 7
- SOGAXMICEFXMKE-UHFFFAOYSA-N Butylmethacrylate Chemical compound CCCCOC(=O)C(C)=C SOGAXMICEFXMKE-UHFFFAOYSA-N 0.000 claims description 6
- 239000002253 acid Substances 0.000 claims description 6
- 150000002148 esters Chemical class 0.000 claims description 6
- LZCLXQDLBQLTDK-UHFFFAOYSA-N ethyl 2-hydroxypropanoate Chemical group CCOC(=O)C(C)O LZCLXQDLBQLTDK-UHFFFAOYSA-N 0.000 claims description 6
- FKRCODPIKNYEAC-UHFFFAOYSA-N ethyl propionate Chemical compound CCOC(=O)CC FKRCODPIKNYEAC-UHFFFAOYSA-N 0.000 claims description 6
- CIHOLLKRGTVIJN-UHFFFAOYSA-N tert‐butyl hydroperoxide Chemical compound CC(C)(C)OO CIHOLLKRGTVIJN-UHFFFAOYSA-N 0.000 claims description 6
- OWUTVCVPEOXXHD-UHFFFAOYSA-N trimethoxy(prop-1-enyl)silane Chemical compound CO[Si](OC)(OC)C=CC OWUTVCVPEOXXHD-UHFFFAOYSA-N 0.000 claims description 6
- JIGUQPWFLRLWPJ-UHFFFAOYSA-N Ethyl acrylate Chemical compound CCOC(=O)C=C JIGUQPWFLRLWPJ-UHFFFAOYSA-N 0.000 claims description 5
- 239000001191 butyl (2R)-2-hydroxypropanoate Substances 0.000 claims description 5
- PNJWIWWMYCMZRO-UHFFFAOYSA-N pent‐4‐en‐2‐one Natural products CC(=O)CC=C PNJWIWWMYCMZRO-UHFFFAOYSA-N 0.000 claims description 5
- MRABAEUHTLLEML-UHFFFAOYSA-N Butyl lactate Chemical group CCCCOC(=O)C(C)O MRABAEUHTLLEML-UHFFFAOYSA-N 0.000 claims description 4
- 125000004423 acyloxy group Chemical group 0.000 claims description 4
- 125000003118 aryl group Chemical group 0.000 claims description 4
- CQEYYJKEWSMYFG-UHFFFAOYSA-N butyl acrylate Chemical compound CCCCOC(=O)C=C CQEYYJKEWSMYFG-UHFFFAOYSA-N 0.000 claims description 4
- 125000000753 cycloalkyl group Chemical group 0.000 claims description 4
- ODQWQRRAPPTVAG-GZTJUZNOSA-N doxepin Chemical group C1OC2=CC=CC=C2C(=C/CCN(C)C)/C2=CC=CC=C21 ODQWQRRAPPTVAG-GZTJUZNOSA-N 0.000 claims description 4
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 claims description 4
- UNDPYSLVZXTXLS-UHFFFAOYSA-N formic acid silane Chemical compound [SiH4].OC=O UNDPYSLVZXTXLS-UHFFFAOYSA-N 0.000 claims description 4
- ILVGAIQLOCKNQA-UHFFFAOYSA-N propyl 2-hydroxypropanoate Chemical group CCCOC(=O)C(C)O ILVGAIQLOCKNQA-UHFFFAOYSA-N 0.000 claims description 4
- NHARPDSAXCBDDR-UHFFFAOYSA-N propyl 2-methylprop-2-enoate Chemical compound CCCOC(=O)C(C)=C NHARPDSAXCBDDR-UHFFFAOYSA-N 0.000 claims description 4
- PNXMTCDJUBJHQJ-UHFFFAOYSA-N propyl prop-2-enoate Chemical compound CCCOC(=O)C=C PNXMTCDJUBJHQJ-UHFFFAOYSA-N 0.000 claims description 4
- 229920002554 vinyl polymer Polymers 0.000 claims description 4
- UICXTANXZJJIBC-UHFFFAOYSA-N 1-(1-hydroperoxycyclohexyl)peroxycyclohexan-1-ol Chemical compound C1CCCCC1(O)OOC1(OO)CCCCC1 UICXTANXZJJIBC-UHFFFAOYSA-N 0.000 claims description 3
- LCPVQAHEFVXVKT-UHFFFAOYSA-N 2-(2,4-difluorophenoxy)pyridin-3-amine Chemical compound NC1=CC=CN=C1OC1=CC=C(F)C=C1F LCPVQAHEFVXVKT-UHFFFAOYSA-N 0.000 claims description 3
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 3
- UHOPWFKONJYLCF-UHFFFAOYSA-N 2-(2-sulfanylethyl)isoindole-1,3-dione Chemical compound C1=CC=C2C(=O)N(CCS)C(=O)C2=C1 UHOPWFKONJYLCF-UHFFFAOYSA-N 0.000 claims description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 3
- FERIUCNNQQJTOY-UHFFFAOYSA-M Butyrate Chemical compound CCCC([O-])=O FERIUCNNQQJTOY-UHFFFAOYSA-M 0.000 claims description 3
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 claims description 3
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 claims description 3
- RJUFJBKOKNCXHH-UHFFFAOYSA-N Methyl propionate Chemical compound CCC(=O)OC RJUFJBKOKNCXHH-UHFFFAOYSA-N 0.000 claims description 3
- NKSJNEHGWDZZQF-UHFFFAOYSA-N ethenyl(trimethoxy)silane Chemical compound CO[Si](OC)(OC)C=C NKSJNEHGWDZZQF-UHFFFAOYSA-N 0.000 claims description 3
- NUFVQEIPPHHQCK-UHFFFAOYSA-N ethenyl-methoxy-dimethylsilane Chemical compound CO[Si](C)(C)C=C NUFVQEIPPHHQCK-UHFFFAOYSA-N 0.000 claims description 3
- SUPCQIBBMFXVTL-UHFFFAOYSA-N ethyl 2-methylprop-2-enoate Chemical compound CCOC(=O)C(C)=C SUPCQIBBMFXVTL-UHFFFAOYSA-N 0.000 claims description 3
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 claims description 3
- 229940017219 methyl propionate Drugs 0.000 claims description 3
- YKYONYBAUNKHLG-UHFFFAOYSA-N n-Propyl acetate Natural products CCCOC(C)=O YKYONYBAUNKHLG-UHFFFAOYSA-N 0.000 claims description 3
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 claims description 3
- 229940090181 propyl acetate Drugs 0.000 claims description 3
- CHQMHPLRPQMAMX-UHFFFAOYSA-L sodium persulfate Substances [Na+].[Na+].[O-]S(=O)(=O)OOS([O-])(=O)=O CHQMHPLRPQMAMX-UHFFFAOYSA-L 0.000 claims description 3
- NQPDZGIKBAWPEJ-UHFFFAOYSA-N valeric acid Chemical compound CCCCC(O)=O NQPDZGIKBAWPEJ-UHFFFAOYSA-N 0.000 claims description 3
- HFZLSTDPRQSZCQ-UHFFFAOYSA-N 1-pyrrolidin-3-ylpyrrolidine Chemical compound C1CCCN1C1CNCC1 HFZLSTDPRQSZCQ-UHFFFAOYSA-N 0.000 claims description 2
- RUMACXVDVNRZJZ-UHFFFAOYSA-N 2-methylpropyl 2-methylprop-2-enoate Chemical compound CC(C)COC(=O)C(C)=C RUMACXVDVNRZJZ-UHFFFAOYSA-N 0.000 claims description 2
- CFVWNXQPGQOHRJ-UHFFFAOYSA-N 2-methylpropyl prop-2-enoate Chemical compound CC(C)COC(=O)C=C CFVWNXQPGQOHRJ-UHFFFAOYSA-N 0.000 claims description 2
- JKTIIXUZAUKYCL-UHFFFAOYSA-N CC(C([Si](C)(C=CC)C(C(C)O)=O)=O)O Chemical compound CC(C([Si](C)(C=CC)C(C(C)O)=O)=O)O JKTIIXUZAUKYCL-UHFFFAOYSA-N 0.000 claims description 2
- SGMPPERPYDBXBB-UHFFFAOYSA-N CC=C[Si](C(C)=O)(C(C)=O)C(C)=O Chemical compound CC=C[Si](C(C)=O)(C(C)=O)C(C)=O SGMPPERPYDBXBB-UHFFFAOYSA-N 0.000 claims description 2
- VQYHMEHQFSQZMI-UHFFFAOYSA-N C[Si](OCCC)(OCCC)C=CC Chemical compound C[Si](OCCC)(OCCC)C=CC VQYHMEHQFSQZMI-UHFFFAOYSA-N 0.000 claims description 2
- QOSMNYMQXIVWKY-UHFFFAOYSA-N Propyl levulinate Chemical compound CCCOC(=O)CCC(C)=O QOSMNYMQXIVWKY-UHFFFAOYSA-N 0.000 claims description 2
- YNSTXWACVFMCBI-UHFFFAOYSA-N [SiH4].C(C(O)C)(=O)O Chemical compound [SiH4].C(C(O)C)(=O)O YNSTXWACVFMCBI-UHFFFAOYSA-N 0.000 claims description 2
- KRVHBXQXWCLZCR-UHFFFAOYSA-N [SiH4].C(C(O)C)(=O)OC Chemical compound [SiH4].C(C(O)C)(=O)OC KRVHBXQXWCLZCR-UHFFFAOYSA-N 0.000 claims description 2
- MISQRWJCJZSTQT-UHFFFAOYSA-N [SiH4].C(C(O)C)(=O)OCC Chemical compound [SiH4].C(C(O)C)(=O)OCC MISQRWJCJZSTQT-UHFFFAOYSA-N 0.000 claims description 2
- NOZAQBYNLKNDRT-UHFFFAOYSA-N [diacetyloxy(ethenyl)silyl] acetate Chemical compound CC(=O)O[Si](OC(C)=O)(OC(C)=O)C=C NOZAQBYNLKNDRT-UHFFFAOYSA-N 0.000 claims description 2
- KMHLDPIIYOXUPF-UHFFFAOYSA-N [diacetyloxy(prop-1-enyl)silyl] acetate Chemical compound CC=C[Si](OC(=O)C)(OC(=O)C)OC(=O)C KMHLDPIIYOXUPF-UHFFFAOYSA-N 0.000 claims description 2
- 125000002252 acyl group Chemical group 0.000 claims description 2
- 229940043232 butyl acetate Drugs 0.000 claims description 2
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 claims description 2
- 125000004177 diethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 claims description 2
- YQGOWXYZDLJBFL-UHFFFAOYSA-N dimethoxysilane Chemical compound CO[SiH2]OC YQGOWXYZDLJBFL-UHFFFAOYSA-N 0.000 claims description 2
- 125000000118 dimethyl group Chemical group [H]C([H])([H])* 0.000 claims description 2
- FWDBOZPQNFPOLF-UHFFFAOYSA-N ethenyl(triethoxy)silane Chemical compound CCO[Si](OCC)(OCC)C=C FWDBOZPQNFPOLF-UHFFFAOYSA-N 0.000 claims description 2
- NNBRCHPBPDRPIT-UHFFFAOYSA-N ethenyl(tripropoxy)silane Chemical compound CCCO[Si](OCCC)(OCCC)C=C NNBRCHPBPDRPIT-UHFFFAOYSA-N 0.000 claims description 2
- MBGQQKKTDDNCSG-UHFFFAOYSA-N ethenyl-diethoxy-methylsilane Chemical compound CCO[Si](C)(C=C)OCC MBGQQKKTDDNCSG-UHFFFAOYSA-N 0.000 claims description 2
- CJCLDCFGJRZTSP-UHFFFAOYSA-N ethenyl-tri(propan-2-yl)silane Chemical compound CC(C)[Si](C=C)(C(C)C)C(C)C CJCLDCFGJRZTSP-UHFFFAOYSA-N 0.000 claims description 2
- 229940093499 ethyl acetate Drugs 0.000 claims description 2
- 125000004494 ethyl ester group Chemical group 0.000 claims description 2
- 229940116333 ethyl lactate Drugs 0.000 claims description 2
- VMVHEFQQPFIRAU-UHFFFAOYSA-N methoxy-dimethyl-prop-1-enylsilane Chemical compound CO[Si](C)(C)C=CC VMVHEFQQPFIRAU-UHFFFAOYSA-N 0.000 claims description 2
- 150000004702 methyl esters Chemical class 0.000 claims description 2
- ZESWQBWQRIRULL-UHFFFAOYSA-N methyl-di(propan-2-yl)-prop-1-enylsilane Chemical compound C(C)(C)[Si](C=CC)(C)C(C)C ZESWQBWQRIRULL-UHFFFAOYSA-N 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- KDCYKKMWRUZITI-UHFFFAOYSA-N prop-1-enyl(tripropoxy)silane Chemical compound CCCO[Si](OCCC)(OCCC)C=CC KDCYKKMWRUZITI-UHFFFAOYSA-N 0.000 claims description 2
- LYBIZMNPXTXVMV-UHFFFAOYSA-N propan-2-yl prop-2-enoate Chemical compound CC(C)OC(=O)C=C LYBIZMNPXTXVMV-UHFFFAOYSA-N 0.000 claims description 2
- BWJUFXUULUEGMA-UHFFFAOYSA-N propan-2-yl propan-2-yloxycarbonyloxy carbonate Chemical compound CC(C)OC(=O)OOC(=O)OC(C)C BWJUFXUULUEGMA-UHFFFAOYSA-N 0.000 claims description 2
- 125000004368 propenyl group Chemical group C(=CC)* 0.000 claims description 2
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 claims description 2
- SJMYWORNLPSJQO-UHFFFAOYSA-N tert-butyl 2-methylprop-2-enoate Chemical compound CC(=C)C(=O)OC(C)(C)C SJMYWORNLPSJQO-UHFFFAOYSA-N 0.000 claims description 2
- GJBRNHKUVLOCEB-UHFFFAOYSA-N tert-butyl benzenecarboperoxoate Chemical compound CC(C)(C)OOC(=O)C1=CC=CC=C1 GJBRNHKUVLOCEB-UHFFFAOYSA-N 0.000 claims description 2
- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 claims description 2
- MJINPUKGRATQAC-UHFFFAOYSA-N triethoxy(prop-1-enyl)silane Chemical compound CCO[Si](OCC)(OCC)C=CC MJINPUKGRATQAC-UHFFFAOYSA-N 0.000 claims description 2
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 claims description 2
- 239000011230 binding agent Substances 0.000 abstract description 25
- 230000008569 process Effects 0.000 abstract description 8
- 230000005540 biological transmission Effects 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 5
- 125000003545 alkoxy group Chemical group 0.000 abstract description 3
- 229910002804 graphite Inorganic materials 0.000 description 17
- 239000010439 graphite Substances 0.000 description 17
- 239000002033 PVDF binder Substances 0.000 description 11
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 9
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 8
- 238000011161 development Methods 0.000 description 7
- 238000012360 testing method Methods 0.000 description 7
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 6
- 229910052744 lithium Inorganic materials 0.000 description 6
- 239000002002 slurry Substances 0.000 description 6
- 239000007772 electrode material Substances 0.000 description 5
- 239000000853 adhesive Substances 0.000 description 4
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- 230000022131 cell cycle Effects 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 239000007773 negative electrode material Substances 0.000 description 4
- 239000013543 active substance Substances 0.000 description 3
- 238000004132 cross linking Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- XDLMVUHYZWKMMD-UHFFFAOYSA-N 3-trimethoxysilylpropyl 2-methylprop-2-enoate Chemical compound CO[Si](OC)(OC)CCCOC(=O)C(C)=C XDLMVUHYZWKMMD-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 241000282414 Homo sapiens Species 0.000 description 2
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 2
- 206010040844 Skin exfoliation Diseases 0.000 description 2
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- QQQSFSZALRVCSZ-UHFFFAOYSA-N triethoxysilane Chemical compound CCO[SiH](OCC)OCC QQQSFSZALRVCSZ-UHFFFAOYSA-N 0.000 description 2
- JGRXEBOFWPLEAV-UHFFFAOYSA-N 2-ethylbutyl prop-2-enoate Chemical compound CCC(CC)COC(=O)C=C JGRXEBOFWPLEAV-UHFFFAOYSA-N 0.000 description 1
- FHVDTGUDJYJELY-UHFFFAOYSA-N 6-{[2-carboxy-4,5-dihydroxy-6-(phosphanyloxy)oxan-3-yl]oxy}-4,5-dihydroxy-3-phosphanyloxane-2-carboxylic acid Chemical compound O1C(C(O)=O)C(P)C(O)C(O)C1OC1C(C(O)=O)OC(OP)C(O)C1O FHVDTGUDJYJELY-UHFFFAOYSA-N 0.000 description 1
- QLTNROKVUOTYQL-UHFFFAOYSA-N C[Si](C)(C)C(OCC=C)=O Chemical compound C[Si](C)(C)C(OCC=C)=O QLTNROKVUOTYQL-UHFFFAOYSA-N 0.000 description 1
- 239000004721 Polyphenylene oxide Substances 0.000 description 1
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical group [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 238000005411 Van der Waals force Methods 0.000 description 1
- KXKVLQRXCPHEJC-UHFFFAOYSA-N acetic acid trimethyl ester Natural products COC(C)=O KXKVLQRXCPHEJC-UHFFFAOYSA-N 0.000 description 1
- 229940072056 alginate Drugs 0.000 description 1
- 229920000615 alginic acid Polymers 0.000 description 1
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- KPUWHANPEXNPJT-UHFFFAOYSA-N disiloxane Chemical class [SiH3]O[SiH3] KPUWHANPEXNPJT-UHFFFAOYSA-N 0.000 description 1
- 239000011883 electrode binding agent Substances 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
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- YSLVSGVAVRTLAV-UHFFFAOYSA-N ethyl(dimethoxy)silane Chemical compound CC[SiH](OC)OC YSLVSGVAVRTLAV-UHFFFAOYSA-N 0.000 description 1
- 125000001153 fluoro group Chemical group F* 0.000 description 1
- WBJINCZRORDGAQ-UHFFFAOYSA-N formic acid ethyl ester Natural products CCOC=O WBJINCZRORDGAQ-UHFFFAOYSA-N 0.000 description 1
- 238000006459 hydrosilylation reaction Methods 0.000 description 1
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- 239000003208 petroleum Substances 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 229920005596 polymer binder Polymers 0.000 description 1
- 239000002491 polymer binding agent Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000007784 solid electrolyte Substances 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 238000011895 specific detection Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000001308 synthesis method Methods 0.000 description 1
- YUYCVXFAYWRXLS-UHFFFAOYSA-N trimethoxysilane Chemical compound CO[SiH](OC)OC YUYCVXFAYWRXLS-UHFFFAOYSA-N 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/04—Acids; Metal salts or ammonium salts thereof
- C08F220/06—Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof
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- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/12—Esters of monohydric alcohols or phenols
- C08F220/14—Methyl esters, e.g. methyl (meth)acrylate
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/12—Esters of monohydric alcohols or phenols
- C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
- C08F220/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
- C08F220/1802—C2-(meth)acrylate, e.g. ethyl (meth)acrylate
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/12—Esters of monohydric alcohols or phenols
- C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
- C08F220/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
- C08F220/1803—C3-(meth)acrylate, e.g. (iso)propyl (meth)acrylate
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/12—Esters of monohydric alcohols or phenols
- C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
- C08F220/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
- C08F220/1804—C4-(meth)acrylate, e.g. butyl (meth)acrylate, isobutyl (meth)acrylate or tert-butyl (meth)acrylate
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- C08F230/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and containing phosphorus, selenium, tellurium or a metal
- C08F230/04—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and containing phosphorus, selenium, tellurium or a metal containing a metal
- C08F230/08—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and containing phosphorus, selenium, tellurium or a metal containing a metal containing silicon
- C08F230/085—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and containing phosphorus, selenium, tellurium or a metal containing a metal containing silicon the monomer being a polymerisable silane, e.g. (meth)acryloyloxy trialkoxy silanes or vinyl trialkoxysilanes
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- 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
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
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- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
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Abstract
The invention discloses a preparation method of a silane polymer for bonding a lithium ion battery cathode, which comprises the following steps: 1) respectively adding an ester compound, a silane compound, an initiator and a solvent into a reaction bottle, heating to 65-85 ℃, and stirring for reacting for 6-12 hours; 2) transferring the reaction solution obtained in the step 1) into a rotary evaporator, and evaporating the solvent to obtain a viscous solid; 3) and (3) drying the viscous solid obtained in the step 2) at 80-120 ℃ for 6-10h in vacuum to obtain the silane polymer for bonding the lithium ion battery cathode. The silane polymer of the binder prepared by the invention introduces a large amount of ester groups and alkoxy groups, has good polar effect, and can enhance the transmission capability of lithium ions in the battery cycle process, thereby improving the electrochemical performance of the lithium ion battery.
Description
Technical Field
The invention relates to a binder used in the field of lithium battery materials, in particular to a silane polymer for bonding a lithium ion battery cathode and a preparation method thereof.
Background
The survival and development of human beings cannot be supported by energy sources, and with the rapid development of the world economy, the industrial demand for energy sources is increased day by day. At present, human survival and industrial development mainly depend on fossil energy such as coal, petroleum, natural gas and the like. However, fossil energy is a non-renewable energy source, and the combustion of fossil energy poses a series of environmental problems: CO in the atmosphere2High content of SO2、NO2The increase of harmful substances, the rise of sea level, the reduction of biological species year by year and the like. In the face of a wide range of energy and environmental problems, the most effective solution is to develop and effectively utilize new clean energy sources, so as to realize a sustainable development strategy. The lithium ion battery has the advantages of high energy density, long cycle life, stable working voltage, small volume, environmental friendliness and the like, is expected to be applied to the storage of clean energy such as electric energy, solar energy, wind energy and the like on a large scale, and is widely concerned and researched by people. Researchers are still making efforts to further improve the performance of lithium ion batteries to support the large-scale energy storage requirements in the application fields of all-electric automobiles, military, aerospace and the like.
The electrochemical performance of a lithium ion battery depends to a large extent on its material, structure and design. At present, the research aiming at the performance improvement of the lithium ion battery mostly surrounds the negative electrode material graphite of the lithium ion battery and the binder of the lithium ion battery. Graphite is a commonly used negative electrode material in lithium ion batteries, but the theoretical specific capacity of the graphite is low, so that the application requirement of electric automobiles on high-energy-density batteries cannot be met. Therefore, researchers have proposed carbon-nanographized graphite to improve its electrochemical properties. Although the properties of graphite are significantly improved by nanocrystallization, most structures have mechanical properties that are not high enough to withstand the high mechanical stresses of the electrode fabrication process (e.g., milling, mixing, and rolling). The adhesive accounts for a small amount of the electrode plate of the lithium ion battery, but plays a very important role.
Polyvinylidene fluoride PVDF has good binding capacity, good electrochemical stability, and the ability to transport ions to the surface of the active material, and is one of the most widely used polymer binders. However, it has weak van der waals' force with an electrode material, cannot buffer a large volume change, and easily reacts with lithiated graphite, resulting in desquamation of electrode particles, thereby causing a decrease in battery capacity. For example, in patent publication 107210138A entitled "polyvinylidene fluoride anode binder in lithium ion capacitor", a PVDF-type binder is disclosed that has good irreversible adhesion to electrode material particles and ensures continuous electron passage of the electrode during charge and discharge cycles. However, the PVDF-based binder has weak van der waals force with the electrode material and easily reacts with the lithiated graphite, causing desquamation of the electrode particles, thereby decreasing the battery capacity.
Therefore, the development of new binders for lithium ion batteries has become an important research direction.
U.S. Pat. No. US2012/0153219 discloses a polyether modified siloxane binder, which overcomes the defects of molecular structure of polar and non-polar lithium ion battery electrode binders, and not only imparts good lithium ion migration capability, but also has good adhesion with electrode active materials. However, the synthesis method adopts a hydrosilylation method, and the reaction requirement can be met only by heating and vulcanizing for more than 72 hours. The reaction time is long, the reaction efficiency is low, and industrialization is difficult, so that the wide application of the method is limited.
Chinese patent publication No. 104877593a entitled "binder for negative electrode, negative electrode and battery of lithium ion battery", discloses a binder composed of alginate and styrene butadiene rubber, which can improve the cycle stability of lithium ion battery and effectively improve the adhesion between electrode material and current collector. However, this is a simple mechanical mixing of multiple polymers, and does not meet the mechanical flexibility requirements of lithium battery binders, and the initial reversible cycling capacity is low.
In conclusion, the influence of the binder on the development of the lithium ion battery is not negligible, and the development of a novel lithium ion battery binder which is green and environment-friendly, stable in cycle performance and strong in adhesion is urgent.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide the silane polymer for bonding the lithium ion battery cathode, which is simple to operate, low in cost, green and environment-friendly and can obviously improve the stability of the lithium ion battery, and the preparation method thereof.
The invention discloses a silane polymer for bonding a lithium ion battery cathode, which is characterized by having a structure shown as a formula I:
in the formula I, R1Represents hydrogen or C1～C8Saturated branched or straight-chain alkyl, cycloalkyl, aryl, or C1～C4Alkoxy group of (a); r2Represents hydrogen or C1～C4Saturated straight or branched chain alkyl; r3Representing a carbon number of C0～C6Saturated straight-chain alkyl or C2～C6An acyloxy group of (a); r4Represents hydrogen or C1～C4Saturated branched or straight-chain alkyl or C1～C4Alkoxy group of (a); r5Representing a carbon number of C1～C4Alkoxy group of C2～C6An ester group, a methyl lactate group, an ethyl lactate group, a propyl lactate group or a butyl lactate group; r6Represents hydrogen or C1～C4Saturated straight chain of (2)Or a branched alkyl group; x and y are positive integers of 1-10, a is an integer, and a is more than or equal to 0 and less than or equal to 3.
In the silane polymer for bonding the lithium ion battery cathode, the affinity between silicon atoms in silane and fluorine atoms in electrolyte is good, so that a stable solid electrolyte membrane can be formed, and the initial reversible cycle capacity can be improved; while R is attached to the silane chain of the silane polymer5The compound contains ester groups or alkoxy groups, so that the transmission capability of lithium ions in the battery cycling process can be enhanced, and the electrochemical performance of the battery can be improved; in addition, the ester group on the left side of the molecular structure is connected with an alkyl group R with higher activity2，R2Is easy to be removed to form carboxyl or R2The carboxyl is directly formed by hydrogen radicals, on one hand, the carboxyl is easy to crosslink to form a three-dimensional network structure, on the other hand, hydrogen bonds are easy to form on the surface of the active substance, the bonding performance of the active substance and the conductive agent is improved, the active substance and the conductive agent are tightly adhered to the current collector, and the integrity of the electrode structure of the battery in the circulation process is kept.
The invention also discloses a preparation method of the silane polymer for bonding the negative electrode of the lithium ion battery, which comprises the following steps:
1) respectively adding an ester compound, a silane compound, an initiator and a solvent into a reaction bottle, heating to 65-85 ℃, and stirring for reacting for 6-12 hours; the molar ratio of the ester compound to the silane compound is 0.75-10: 1; the dosage of the initiator is 0.1 to 0.9 percent of the sum of the dosage weight of the ester compound and the silane compound;
2) transferring the reaction solution obtained in the step 1) into a rotary evaporator, and evaporating the solvent to obtain a viscous solid;
3) and (3) drying the viscous solid obtained in the step 2) at 80-120 ℃ for 6-10h in vacuum to obtain the silane polymer for bonding the lithium ion battery cathode.
The preparation method has the advantages of simple process, convenient operation and short reaction time, and can realize industrial production. Meanwhile, the viscous solid prepared in the step 2) is a silane polymer crude product, and after the drying in the step 3), hydrogen or alkyl with high activity connected with the ester compound is removed to form carboxyl, and a three-dimensional network structure is formed by crosslinking among the carboxyl, so that the adhesive capacity of the silane polymer as a binder is effectively improved, and the stability of an electrode structure is facilitated.
Further, the molecular formula of the ester compound is shown as formula II:
in the formula II, R1Represents hydrogen or C1～C8Saturated branched or straight-chain alkyl, cycloalkyl, aryl, or C1～C4Alkoxy group of (a); r2Represents hydrogen or C1～C4Saturated straight or branched chain alkyl.
Preferably, the ester compound is one of the following: acrylic acid, methyl acrylate, ethyl acrylate, propyl acrylate, isopropyl acrylate, butyl acrylate, t-butyl acrylate, isobutyl acrylate, methacrylic acid, methyl methacrylate, ethyl methacrylate, propyl methacrylate, butyl methacrylate, t-butyl methacrylate, isobutyl methacrylate, 2-ethacrylic acid, methyl 2-ethacrylate, ethyl 2-ethacrylate, propyl 2-ethacrylate, butyl 2-ethacrylate, t-butyl 2-ethacrylate.
Further, the molecular formula of the silane compound is shown as formula III:
in the formula III, R3Representing a carbon number of C0～C6Saturated straight-chain alkyl or C2～C6An acyloxy group of (a); r4Represents hydrogen or C1～C4Saturated straight-chain or branched alkyl, or C1～C4Alkoxy group of (a); r5Representing a carbon number of C1～C4Alkoxy group of C2～C6An ester group, a methyl lactate group, an ethyl lactate group, a propyl lactate group or a butyl lactate group; r6Represents hydrogen or C1～C4A is an integer, and a is more than or equal to 0 and less than or equal to 3.
Further, when R is3Represents a carbon number of C0～C6The silane compound has a molecular formula shown in formula IV:
b is an integer, and b is more than or equal to 0 and less than or equal to 6; a is an integer, and a is more than or equal to 0 and less than or equal to 3. When R is3When the number of C is 0, it represents R3Absent, Si is directly attached to the double bond.
Further, when R is3Represents a carbon number of C2～C6When the acyl group is (A), the molecular formula of the silane compound is shown as the formula V:
c is an integer, and c is more than or equal to 1 and less than or equal to 5; a is an integer, and a is more than or equal to 0 and less than or equal to 3.
Preferably, the silane compound is one of the following: vinyltrimethoxysilane, propenyltrimethoxysilane, butenyltrimethoxysilane, vinyltriethoxysilane, propenyltriethoxysilane, vinyltripropoxysilane, propenyltripropoxysilane, vinyltriisopropylsilane, propenyltriiopropylsilane, vinyltrimethylenesilane, propenyltrimethoxysilane, vinyltriacetoxysilane, propenyltriacetoxysilane, gamma-methacryloxymethyltrimethoxysilane, gamma-methacryloxymethyltriethoxysilane, propenyltrimethoxysilane, propenyltr, Gamma-methacryloyloxymethyltripropoxysilane, gamma-methacryloyloxyethyltrimethoxysilane, gamma-methacryloyloxyethyltriethoxysilane, gamma-methacryloyloxyethyltripropoxysilane, gamma-methacryloyloxypropyltrimethoxysilane, gamma-methacryloyloxypropyltriethoxysilane, gamma-methacryloyloxypropyltripropoxysilane, gamma-methacryloyloxytrimethyl-acid methyl ester silane, gamma-methacryloyloxytrimethyl-acid ethyl ester silane, gamma-methacryloyloxypropyl ester silane, gamma-methacryloyloxytrimethyl-acid propyl ester silane, gamma-methacryloyloxypropyl ester silane, gamma-methacryloyloxyethyl ester silane, Gamma-methacryloxytri-propyl ester silane, gamma-methacryloxytri-methyl ester silane, gamma-methacryloxytri-ethyl ester silane, gamma-methacryloxytri-propyl ester silane, vinyl dimethyl methoxy silane, propenyl dimethyl methoxy silane, butenyl methyl dimethoxy silane, vinyl methyl diethoxy silane, propenyl methyl dipropoxy silane, vinyl dimethyl iso-propyl silane, propenyl methyl di-iso-propyl silane, vinyl methyl diformate silane, propenyl dimethyl formate silane, vinyl diethyl formate silane, gamma-methacryloxy tri-ethyl ester silane, gamma-methacryloxytri-ethyl ester silane, gamma-methacrylo, Propenyl ethyl methyl dicarboxylate silane, gamma-methacryloxymethylethyl dimethoxysilane, gamma-methacryloxyethylmethyldimethoxysilane, gamma-methacryloxypropylmethyldimethoxysilane, gamma-methacryloxymethyl dicarboxylate silane, gamma-methacryloxyethyl dicarboxylate silane; vinyltrilactate silane, propenyltrimethylactate silane, vinyltrilactate silane, propenyltriethyllactate silane, vinyltrilactate silane, propenyltriprctate silane, vinyltributyl lactate silane, propenyltrimethylactate silane, gamma-methacryloyltrimethylactate silane, gamma-methacryloyltriacetylsilane, vinylmethyldialyllactalylsilane, propenylmethyldiethyl methyldialctate silane, propenylmethyldilactylsilane, propenyltriacetylsilane, propenyltrialkyi-propylsilane, propenyltrialyllactalysilane, propenyltrialyllactaly, Vinyl dimethyl propyl lactate silane, propenyl methyl propyl lactate silane, vinyl dimethyl butyl lactate silane, propenyl methyl butyl lactate silane, gamma-methacryloxy methyl lactate silane, gamma-methacryloxy ethyl lactate silane, gamma-methacryloxy dimethyl ethyl lactate silane, and gamma-methacryloxy dimethyl propyl lactate silane.
Further, the solvent is one or a mixture of more than two of the following: propyl formate, butyl formate, ethyl acetate, propyl acetate, butyl acetate, methyl propionate, ethyl propionate, propyl propionate or butyl propionate.
Further, the initiator is one of the following: azodiisobutyronitrile, azodiisoheptonitrile, benzoyl peroxide, isophenylhydroperoxide, tert-butyl hydroperoxide, dibenzoyl peroxide, benzoyl tert-butyl peroxide, cyclohexanone peroxide, diisopropyl peroxydicarbonate, potassium persulfate, sodium persulfate and ammonium persulfate.
The invention has the beneficial effects that:
1. according to the silane polymer as the binder, alkyl connected with the ester group on the left side is easy to remove under heating to form carboxyl or directly connected with hydrogen with high activity to form carboxyl, and the carboxyl is in-situ crosslinked to form a three-dimensional network structure, so that the adhesion capability of the silane polymer as the binder is effectively improved, and the stability of an electrode structure is facilitated; meanwhile, the crosslinking reaction can ensure that the active material can still be effectively combined with the current collector in the process of lithium ion intercalation and deintercalation, so that the adhesive capacity of the adhesive is further improved; in addition, the carboxyl is taken as a cross-linking site, so that a lithium ion transmission channel is shortened, and the electrochemical performance of the lithium ion battery is improved;
2. according to the invention, a large number of ester groups and alkoxy groups are introduced into the silane polymer, so that the polar effect is good, the transmission capability of lithium ions in the battery circulation process can be enhanced, and the electrochemical performance of the lithium ion battery is improved;
3. in the preparation method, the selected raw materials are cheap and easy to obtain, the preparation process is simple, the operation is convenient, the time consumption is short, and the industrial production is easy to realize.
Detailed Description
In order to explain technical contents, structural features, and objects and effects of the present invention in detail, the following description is given in detail with reference to the embodiments.
Example 1
Firstly, 25 g (0.305mol) of acrylic acid, 0.032 g of initiator azobisisobutyronitrile and 32mL of butyl acetate solvent are added into a four-neck round-bottom flask, and 6.5 g (0.039mol) of vinyltrimethoxysilane is continuously added into the four-neck flask in a dropwise manner under stirring; then heating to 65 ℃, keeping the temperature and continuously stirring for reaction for 12 hours; transferring the reaction solution obtained by the reaction to a rotary evaporator, and evaporating redundant solvent to obtain a viscous solid; and finally, drying the viscous solid for 8 hours in vacuum at 100 ℃ to obtain the silane polymer for bonding the lithium ion battery cathode.
The molar ratio of the ester compound to the silane compound is 0.75-10: 1; the dosage of the initiator is 0.1 to 0.9 percent of the sum of the dosage weight of the ester compound and the silane compound;
example 2
First, 25 g (0.291mol) of methyl acrylate, 0.12 g of ammonium persulfate as an initiator, and 40mL of ethyl propionate solvent were added to a four-necked round-bottomed flask, and 15 g (0.037mol) of ethyl vinyltrilactate silane was continuously added dropwise to the four-necked flask with stirring; then heating to 85 ℃, keeping the temperature and continuously stirring for reacting for 6 hours; transferring the reaction solution obtained by the reaction to a rotary evaporator, and evaporating redundant solvent to obtain a viscous solid; and finally, drying the viscous solid for 8 hours in vacuum at 100 ℃ to obtain the silane polymer for bonding the lithium ion battery cathode.
Example 3
Firstly, 25 g (0.250mol) of ethyl acrylate, 0.13 g of initiator azobisisobutyronitrile and 44mL of butyl acetate solvent are added into a four-neck round-bottom flask, and 19 g (0.037mol) of propenyl ethyl trilactate silane is continuously added into the four-neck flask dropwise under stirring; then heating to 70 ℃, keeping the temperature and continuously stirring for reaction for 10 hours; transferring the reaction solution obtained by the reaction to a rotary evaporator, and evaporating redundant solvent to obtain a viscous solid; and finally, drying the viscous solid at 80 ℃ for 10h in vacuum to obtain the silane polymer for bonding the lithium ion battery cathode.
Example 4
Firstly, 25 g (0.195mol) of tert-butyl acrylate, 0.26 g of benzoyl peroxide as an initiator and 85mL of propyl formate as a solvent are added into a four-neck round-bottom flask, and 60 g (0.237mol) of gamma-methacryloyloxymethyltriethoxysilane is continuously added dropwise into the four-neck flask under stirring; then heating to 70 ℃, keeping the temperature and continuously stirring for reacting for 8 hours; transferring the reaction solution obtained by the reaction to a rotary evaporator, and evaporating redundant solvent to obtain a viscous solid; and finally, drying the viscous solid for 6 hours in vacuum at 120 ℃ to obtain the silane polymer for bonding the lithium ion battery cathode.
Example 5
First, 25 g (0.219mol) of propyl acrylate, 0.14 g of azobisisobutyronitrile as an initiator, and 48mL of butyl acetate as a solvent were put into a four-necked round-bottomed flask, and 23 g (0.044mol) of ethyl allyl trilactate silane was continuously added dropwise to the four-necked flask while stirring; then heating to 70 ℃, keeping the temperature and continuously stirring for reaction for 10 hours; transferring the reaction solution obtained by the reaction to a rotary evaporator, and evaporating redundant solvent to obtain a viscous solid; and finally, drying the viscous solid for 9 hours at 90 ℃ in vacuum to obtain the silane polymer for bonding the lithium ion battery cathode.
Example 6
Firstly, 25 g (0.195mol) of butyl acrylate, 0.23 g of initiator ammonium persulfate and 76mL of methyl propionate solvent are added into a four-neck round-bottom flask, and 51 g (0.230mol) of gamma-methacryloxymethyltrimethoxysilane is continuously dripped into the four-neck flask under stirring; then heating to 75 ℃, keeping the temperature and continuously stirring for reaction for 9 hours; transferring the reaction solution obtained by the reaction to a rotary evaporator, and evaporating redundant solvent to obtain a viscous solid; and finally, drying the viscous solid for 7 hours at 110 ℃ in vacuum to obtain the silane polymer for bonding the lithium ion battery cathode.
Example 7
First, 25 g (0.195mol) of t-butyl acrylate, 0.15 g of benzoyl peroxide as an initiator, and 49mL of butyl acetate solvent were added to a four-necked round-bottomed flask, and 24 g (0.066mol) of vinyltrilactate silane was continuously added dropwise to the four-necked flask with stirring; then heating to 80 ℃, keeping the temperature and continuously stirring for reaction for 7 hours; transferring the reaction solution obtained by the reaction to a rotary evaporator, and evaporating redundant solvent to obtain a viscous solid; and finally, drying the viscous solid for 8 hours in vacuum at 100 ℃ to obtain the silane polymer for bonding the lithium ion battery cathode.
Example 8
Firstly, 25 g (0.291mol) of methacrylic acid, 0.18 g of initiator sodium persulfate and 59mL of butyl formate solvent are added into a four-neck round-bottom flask, and 34 g (0.154mol) of gamma-methacryloyloxyethyl trimethoxysilane is continuously added into the four-neck flask dropwise under stirring; then heating to 75 ℃, keeping the temperature and continuously stirring for reacting for 8 hours; transferring the reaction solution obtained by the reaction to a rotary evaporator, and evaporating redundant solvent to obtain a viscous solid; and finally, drying the viscous solid for 7 hours at 110 ℃ in vacuum to obtain the silane polymer for bonding the lithium ion battery cathode.
Example 9
First, 25 g (0.250mol) of methyl methacrylate, 0.14 g of azobisisoheptonitrile as an initiator, and 48mL of propyl acetate solvent were added to a four-necked round-bottomed flask, and 23 g (0.083mol) of γ -methacryloyloxyethyltriethoxysilane was further added dropwise to the four-necked flask with stirring; then heating to 75 ℃, keeping the temperature and continuously stirring for reacting for 8 hours; transferring the reaction solution obtained by the reaction to a rotary evaporator, and evaporating redundant solvent to obtain a viscous solid; and finally, drying the viscous solid for 8 hours in vacuum at 100 ℃ to obtain the silane polymer for bonding the lithium ion battery cathode.
Example 10
Firstly, 25 g (0.195mol) of tert-butyl acrylate, 0.14 g of initiator azobisisobutyronitrile and 45mL of butyl acetate solvent are added into a four-neck round-bottom flask, and 20 g (0.071mol) of vinyl trimethyl carbomethoxysilane is continuously added into the four-neck flask by dripping under stirring; then heating to 65 ℃, keeping the temperature and continuously stirring for reaction for 12 hours; transferring the reaction solution obtained by the reaction to a rotary evaporator, and evaporating redundant solvent to obtain a viscous solid; and finally, drying the viscous solid for 6 hours in vacuum at 120 ℃ to obtain the silane polymer for bonding the lithium ion battery cathode.
Example 11
Firstly, 25 g (0.219mol) of ethyl methacrylate, 0.16 g of initiator dibenzoyl peroxide and 52mL of butyl formate solvent are added into a four-neck round-bottom flask, and 27 g (0.109mol) of gamma-methacryloxypropyltrimethoxysilane is continuously added into the four-neck flask dropwise under stirring; then heating to 85 ℃, keeping the temperature and continuously stirring for reacting for 6 hours; transferring the reaction solution obtained by the reaction to a rotary evaporator, and evaporating redundant solvent to obtain a viscous solid; and finally, drying the viscous solid for 6 hours in vacuum at 120 ℃ to obtain the silane polymer for bonding the lithium ion battery cathode.
Example 12
Firstly, 25 g (0.195mol) of propyl methacrylate, 0.13 g of initiator ammonium persulfate and 44mL of butyl acetate solvent are added into a four-neck round-bottom flask, and 19 g (0.066mol) of gamma-methacryloxypropyltriethoxysilane is continuously dripped into the four-neck flask under stirring; then heating to 80 ℃, keeping the temperature and continuously stirring for reaction for 7 hours; transferring the reaction solution obtained by the reaction to a rotary evaporator, and evaporating redundant solvent to obtain a viscous solid; and finally, drying the viscous solid for 8 hours in vacuum at 100 ℃ to obtain the silane polymer for bonding the lithium ion battery cathode.
Example 13
First, 25 g (0.195mol) of t-butyl acrylate, 0.13 g of azobisisobutyronitrile as an initiator, and 43mL of butyl acetate as a solvent were put into a four-necked round-bottomed flask, and 18 g (0.048mol) of methyl allyl trilactate silane was continuously added dropwise to the four-necked flask while stirring; then heating to 70 ℃, keeping the temperature and continuously stirring for reacting for 8 hours; transferring the reaction solution obtained by the reaction to a rotary evaporator, and evaporating redundant solvent to obtain a viscous solid; and finally, drying the viscous solid for 8 hours in vacuum at 100 ℃ to obtain the silane polymer for bonding the lithium ion battery cathode.
Example 14
First, 25 g (0.291mol) of methyl acrylate, 0.11 g of initiator ammonium persulfate, and 38mL of ethyl acetate solvent were added to a four-necked round-bottomed flask, and 10.5 g (0.029mol) of vinyltrilactate silane was continuously added dropwise to the four-necked flask with stirring; then heating to 70 ℃, keeping the temperature and continuously stirring for reacting for 8 hours; transferring the reaction solution obtained by the reaction to a rotary evaporator, and evaporating redundant solvent to obtain a viscous solid; and finally, drying the viscous solid for 8 hours in vacuum at 100 ℃ to obtain the silane polymer for bonding the lithium ion battery cathode.
Example 15
Firstly, 25 g (0.250mol) of ethyl acrylate, 0.13 g of initiating agent cyclohexanone peroxide and 42mL of propyl propionate solvent are added into a four-neck round-bottom flask, and 17 g (0.045mol) of gamma-methacryloyloxyethyltricarboxylate silane is continuously dripped into the four-neck flask under stirring; then heating to 70 ℃, keeping the temperature and continuously stirring for reacting for 8 hours; transferring the reaction solution obtained by the reaction to a rotary evaporator, and evaporating redundant solvent to obtain a viscous solid; and finally, drying the viscous solid for 8 hours in vacuum at 100 ℃ to obtain the silane polymer for bonding the lithium ion battery cathode.
Example 16
Firstly, 25 g (0.195mol) of tert-butyl acrylate, 0.18 g of initiator azobisisobutyronitrile and 59mL of butyl acetate solvent are added into a four-neck round-bottom flask, and 34 g (0.168mol) of vinyl diethyl ethyl formate silane is continuously added into the four-neck flask dropwise under stirring; then heating to 70 ℃, keeping the temperature and continuously stirring for reacting for 8 hours; transferring the reaction solution obtained by the reaction to a rotary evaporator, and evaporating redundant solvent to obtain a viscous solid; and finally, drying the viscous solid for 8 hours in vacuum at 100 ℃ to obtain the silane polymer for bonding the lithium ion battery cathode.
Example 17
First, 25 g (0.219mol) of propyl acrylate, 0.16 g of initiator potassium persulfate, and 53mL of ethyl acetate solvent were charged into a four-necked round-bottomed flask, and 28 g (0.074mol) of propenyl methyl trilactate silane was continuously added dropwise to the four-necked flask with stirring; then heating to 70 ℃, keeping the temperature and continuously stirring for reacting for 8 hours; transferring the reaction solution obtained by the reaction to a rotary evaporator, and evaporating redundant solvent to obtain a viscous solid; and finally, drying the viscous solid for 8 hours in vacuum at 100 ℃ to obtain the silane polymer for bonding the lithium ion battery cathode.
Example 18
First, 25 g (0.195mol) of butyl acrylate, 0.15 g of initiator benzoyl peroxide, 50mL of butyl acetate solvent were added to a four-neck round-bottom flask, and 25 g (0.074mol) of propenyl propyl trilactate silane was continuously added dropwise to the four-neck flask with stirring; then heating to 70 ℃, keeping the temperature and continuously stirring for reacting for 8 hours; transferring the reaction solution obtained by the reaction to a rotary evaporator, and evaporating redundant solvent to obtain a viscous solid; and finally, drying the viscous solid for 8 hours in vacuum at 100 ℃ to obtain the silane polymer for bonding the lithium ion battery cathode.
Example 19
Firstly, 25 g (0.195mol) of tert-butyl acrylate, 0.24 g of initiator azobisisobutyronitrile and 80mL of butyl acetate solvent are added into a four-neck round-bottom flask, and 55 g (0.148mol) of gamma-methacryloxy methyl trilactate silane is continuously added dropwise into the four-neck flask under stirring; then heating to 70 ℃, keeping the temperature and continuously stirring for reacting for 8 hours; transferring the reaction solution obtained by the reaction to a rotary evaporator, and evaporating redundant solvent to obtain a viscous solid; and finally, drying the viscous solid for 8 hours in vacuum at 100 ℃ to obtain the silane polymer for bonding the lithium ion battery cathode.
Example 20
Firstly, 25 g (0.195mol) of tert-butyl acrylate, 0.14 g of initiator ammonium persulfate and 47mL of butyl acetate solvent are added into a four-neck round-bottom flask, and 22 g (0.100mol) of gamma-methacryloyloxymethyltrimethoxysilane is continuously dripped into the four-neck flask under stirring; then heating to 70 ℃, keeping the temperature and continuously stirring for reacting for 8 hours; transferring the reaction solution obtained by the reaction to a rotary evaporator, and evaporating redundant solvent to obtain a viscous solid; and finally, drying the viscous solid for 8 hours in vacuum at 100 ℃ to obtain the silane polymer for bonding the lithium ion battery cathode.
Example 21
Firstly, 25 g (0.250mol) of 2-ethacrylic acid, 0.11 g of initiator tert-butyl hydroperoxide and 37mL of methyl acetate solvent are added into a four-neck round-bottom flask, and 12 g (0.047mol) of gamma-methacryloyloxymethyl triethoxysilane is continuously added into the four-neck flask dropwise under stirring; then heating to 70 ℃, keeping the temperature and continuously stirring for reacting for 8 hours; transferring the reaction solution obtained by the reaction to a rotary evaporator, and evaporating redundant solvent to obtain a viscous solid; and finally, drying the viscous solid for 8 hours in vacuum at 100 ℃ to obtain the silane polymer for bonding the lithium ion battery cathode.
Example 22
Firstly, 25 g (0.195mol) of ethyl 2-ethacrylate, 0.17 g of initiator benzoyl peroxide and 55mL of ethyl acetate solvent are added into a four-neck round-bottom flask, and 30 g (0.130mol) of vinyl dimethyl butyl lactate silane is continuously added into the four-neck flask in a dropwise manner under stirring; then heating to 70 ℃, keeping the temperature and continuously stirring for reacting for 8 hours; transferring the reaction solution obtained by the reaction to a rotary evaporator, and evaporating redundant solvent to obtain a viscous solid; and finally, drying the viscous solid for 8 hours in vacuum at 100 ℃ to obtain the silane polymer for bonding the lithium ion battery cathode.
Example 23
Firstly, 25 g (0.176mol) of 2-ethyl butyl acrylate, 0.36 g of initiator benzoyl peroxide and 60mL of butyl acetate solvent are added into a four-neck round-bottom flask, and 35 g (0.127mol) of gamma-methacryloyloxyethyl triethoxysilane is continuously added into the four-neck flask dropwise under stirring; then heating to 70 ℃, keeping the temperature and continuously stirring for reacting for 8 hours; transferring the reaction solution obtained by the reaction to a rotary evaporator, and evaporating redundant solvent to obtain a viscous solid; and finally, drying the viscous solid for 8 hours in vacuum at 100 ℃ to obtain the silane polymer for bonding the lithium ion battery cathode.
Example 24
Firstly, 25 g (0.195mol) of propyl methacrylate, 0.15 g of initiator ammonium persulfate and 49mL of ethyl acetate solvent are added into a four-neck round-bottom flask, and 24 g (0.097mol) of gamma-methacryloxypropyl trimethoxysilane is continuously added into the four-neck flask dropwise under stirring; then heating to 70 ℃, keeping the temperature and continuously stirring for reacting for 8 hours; transferring the reaction solution obtained by the reaction to a rotary evaporator, and evaporating redundant solvent to obtain a viscous solid; and finally, drying the viscous solid for 8 hours in vacuum at 100 ℃ to obtain the silane polymer for bonding the lithium ion battery cathode.
Example 25
Firstly, 25 g (0.176mol) of butyl methacrylate, 0.26 g of initiator azobisisobutyronitrile and 50mL of ethyl acetate solvent are added into a four-neck round-bottom flask, and 17 g (0.059mol) of gamma-methacryloxypropyltriethoxysilane is continuously added into the four-neck flask dropwise under stirring; then heating to 70 ℃, keeping the temperature and continuously stirring for reacting for 8 hours; transferring the reaction solution obtained by the reaction to a rotary evaporator, and evaporating redundant solvent to obtain a viscous solid; and finally, drying the viscous solid for 8 hours in vacuum at 100 ℃ to obtain the silane polymer for bonding the lithium ion battery cathode.
Example 26
Firstly, 25 g (0.291mol) of methyl acrylate, 0.63 g of initiator azobisisobutyronitrile and 70mL of ethyl acetate solvent are added into a four-neck round-bottom flask, and 45 g (0.206mol) of gamma-methacryloyloxymethyl ethyl dimethoxysilane is continuously dripped into the four-neck flask under stirring; then heating to 70 ℃, keeping the temperature and continuously stirring for reacting for 8 hours; transferring the reaction solution obtained by the reaction to a rotary evaporator, and evaporating redundant solvent to obtain a viscous solid; and finally, drying the viscous solid for 8 hours in vacuum at 100 ℃ to obtain the silane polymer for bonding the lithium ion battery cathode.
Example 27
Firstly, 25 g (0.250mol) of ethyl acrylate, 0.18 g of initiator azobisisobutyronitrile and 60mL of ethyl acetate solvent are added into a four-neck round-bottom flask, and 38.7 g (0.334mol) of vinyl dimethylmethoxysilane is continuously added into the four-neck flask by dripping under stirring; then heating to 70 ℃, keeping the temperature and continuously stirring for reacting for 8 hours; transferring the reaction solution obtained by the reaction to a rotary evaporator, and evaporating redundant solvent to obtain a viscous solid; and finally, drying the viscous solid for 8 hours in vacuum at 100 ℃ to obtain the silane polymer for bonding the lithium ion battery cathode.
Example 28
The lithium ion battery prepared in example 1 above was assembled with the silane polymer for bonding to the negative electrode: uniformly mixing the negative active material graphite, the conductive carbon black and the obtained binding agent silane polymer according to the mass ratio (8:1:1), adding an N-methyl pyrrolidone solvent, preparing slurry, coating the slurry on a copper foil, drying the slurry in vacuum at 120 ℃ for 8 hours to obtain a negative pole piece, cutting the negative pole piece into a circular sheet with the diameter of 12mm, and moving the circular sheet into a glove box to finish the assembly of the lithium ion battery. Standing for 12h, and testing the electrochemical performance and the battery cycle performance.
Example 29 example 54
The preparation method of example 28 was adopted, and the lithium ion button cell assembled from the silane polymer was bonded to the negative electrode of the lithium ion battery obtained in examples 2 to 27 in order, and the electrochemical performance and the battery cycle performance were tested after standing for 12 hours.
Example 55
Adopting PVDF binder to assemble a button type lithium ion battery, uniformly mixing the negative active material graphite, conductive carbon black and the PVDF binder according to the mass ratio (8:1:1), adding a proper amount of N-methyl pyrrolidone solvent, preparing slurry, coating the slurry on copper foil, drying the slurry in vacuum at 120 ℃ for 8 hours to obtain a negative pole piece, cutting the negative pole piece into a circular sheet with the diameter of 12mm, and moving the circular sheet into a glove box to finish the assembly of the lithium ion battery. Standing for 12h, and testing the electrochemical performance and the battery cycle performance. The PVDF binder was purchased from suwei, usa under the 6020 brand.
The lithium ion batteries prepared in examples 28 to 55 were subjected to battery performance tests, and the test data are shown in Table 1. The specific detection method for various performances is as follows:
1) specific capacity of initial discharge: the specific capacity of the first discharge is shown, the Li/Celgard2500 diaphragm/graphite button cell is assembled by taking metal lithium as an anode and graphite as a cathode, and the constant current analysis is carried out on a Xinwei cell cycle workstation, the test voltage range is 0.01-2V, and the charge-discharge multiplying power is 0.2C.
2) First charge-discharge efficiency: the ratio of the discharge capacity to the charge capacity of the first charge-discharge cycle is shown, the Li/Celgard2500 diaphragm/graphite button cell is assembled by taking metal lithium as the anode and graphite as the cathode, the constant current analysis is carried out on a Xinwei cell cycle workstation, the test voltage range is 0.01-2V, and the charge-discharge multiplying power is 0.2C.
3) Capacity retention ratio: the Li/Celgard2500 diaphragm/graphite button cell is assembled by taking metal lithium as the anode and graphite as the cathode, and is subjected to constant current analysis on a Xinwei cell cycle workstation, the test voltage range is 0.01-2V, the charge-discharge multiplying power is 0.2C, and the cycle lasts for 100 weeks.
4) Testing internal resistance: the Li/Celgard2500 diaphragm/graphite button cell is assembled by taking metal lithium as the anode and graphite as the cathode and tested on a Xinwei cell cycle workstation, wherein the frequency is 100kHz-10mHz, and the disturbance voltage is 5 mV.
Table 1 shows the data of the measurements of the battery performance of the lithium ion batteries prepared in examples 28 to 55
As can be seen from Table 1, the first discharge specific capacity of the lithium ion battery prepared by using the silane polymer prepared by the invention as a binder reaches more than 385mAh/g, and is higher than that of the lithium ion battery prepared by using PVDF as a binder by more than 65 mAh/g; secondly, the lithium ion battery prepared by using the silane polymer prepared by the invention as a binder has the first charge-discharge efficiency of more than 88.7 percent, which is about 8 percent higher than that of the lithium ion battery prepared by using PVDF as the binder. And thirdly, the capacity retention rate of the lithium ion battery prepared by using the silane polymer prepared by the invention as the binder reaches 82.3 percent after 100 cycles, and is higher than that of the lithium ion battery prepared by using PVDF as the binder by more than 9 percent. Finally, the internal resistance of the lithium ion battery prepared by using the silane polymer prepared by the invention as a binder is basically below 40m omega and is far lower than 56m omega of the lithium ion battery prepared by using PVDF as a binder.
As can be seen from the data in Table 1, the cross-linked structure of the lithium ion battery prepared by using the silane polymer as the binder provides enough cross-linked sites for lithium ion transmission, so that the internal resistance of the battery is effectively reduced, the first charge-discharge efficiency of the battery is improved, and the cycle stability of the battery is improved.
It should be noted that, although the above embodiments have been described herein, the invention is not limited thereto. Therefore, based on the innovative concepts of the present invention, the technical solutions of the present invention can be directly or indirectly applied to other related technical fields by making changes and modifications to the embodiments described herein or by using equivalent structures or equivalent processes performed in the present specification, and are included in the scope of the present invention.
Claims (10)
1. The silane polymer for bonding the negative electrode of the lithium ion battery is characterized by having a structure shown as a formula I:
in the formula I, R1Represents hydrogen or C1～C8Saturated branched or straight-chain alkyl, cycloalkyl, aryl, or C1～C4Alkoxy group of (a); r2Represents hydrogen or C1～C4Saturated straight or branched chain alkyl; r3Representing a carbon number of C0～C6Saturated straight-chain alkyl or C2～C6An acyloxy group of (a); r4Represents hydrogen or C1～C4Saturated branched or straight-chain alkyl or C1～C4Alkoxy group of (a); r5Representing a carbon number of C1～C4Alkoxy group of C2～C6An ester group, a methyl lactate group, an ethyl lactate group, a propyl lactate group or a butyl lactate group; r6Represents hydrogen or C1～C4Saturated linear or branched alkyl groups of (a); x and y are positive integers of 1-10, a is an integer, and a is more than or equal to 0 and less than or equal to 3.
2. The method for preparing the silane polymer for bonding the negative electrode of the lithium ion battery according to claim 1, wherein the silane polymer for bonding the negative electrode of the lithium ion battery comprises the following steps: which comprises the following steps:
1) respectively adding an ester compound, a silane compound, an initiator and a solvent into a reaction bottle, heating to 65-85 ℃, and stirring for reacting for 6-12 hours; the molar ratio of the ester compound to the silane compound is 0.75-10: 1; the dosage of the initiator is 0.1 to 0.9 percent of the sum of the dosage weight of the ester compound and the silane compound;
2) transferring the reaction solution obtained in the step 1) into a rotary evaporator, and evaporating the solvent to obtain a viscous solid;
3) and (3) drying the viscous solid obtained in the step 2) at 80-120 ℃ for 6-10h in vacuum to obtain the silane polymer for bonding the lithium ion battery cathode.
3. The preparation method of the silane polymer for bonding the negative electrode of the lithium ion battery as claimed in claim 2, wherein the molecular formula of the ester compound is as shown in formula II:
in the formula II, R1Represents hydrogen or C1～C8Saturated straight-chain or branched alkyl, cycloalkyl, aryl or C1～C4Alkoxy group of (a); r2Represents hydrogen or C1～C4Saturated straight or branched chain alkyl.
4. The method for preparing the silane polymer for bonding the negative electrode of the lithium ion battery according to claim 3, wherein the ester compound is one of the following: acrylic acid, methyl acrylate, ethyl acrylate, propyl acrylate, isopropyl acrylate, butyl acrylate, t-butyl acrylate, isobutyl acrylate, methacrylic acid, methyl methacrylate, ethyl methacrylate, propyl methacrylate, butyl methacrylate, t-butyl methacrylate, isobutyl methacrylate, 2-ethacrylic acid, methyl 2-ethacrylate, ethyl 2-ethacrylate, propyl 2-ethacrylate, butyl 2-ethacrylate, t-butyl 2-ethacrylate.
5. The method for preparing the silane polymer for bonding the negative electrode of the lithium ion battery as claimed in claim 2, wherein the molecular formula of the silane compound is as shown in formula III:
in the formula III, R3Representing a carbon number of C0～C6Saturated straight-chain alkyl or C2～C6An acyloxy group of (a); r4Represents hydrogen or C1～C4Saturated straight-chain or branched alkyl, or C1～C4Alkoxy group of (a); r5Representing a carbon number of C1～C4Alkoxy group of C2～C6An ester group, a methyl lactate group, an ethyl lactate group, a propyl lactate group or a butyl lactate group; r6Represents hydrogen or C1～C4A is an integer, and a is more than or equal to 0 and less than or equal to 3.
6. The method for preparing the silane polymer for bonding the negative electrode of the lithium ion battery as claimed in claim 5, wherein: when R is3Represents a carbon number of C0～C6The silane compound has a molecular formula shown in formula IV:
b is an integer, and b is more than or equal to 0 and less than or equal to 6; a is an integer, and a is more than or equal to 0 and less than or equal to 3.
7. The method for preparing the silane polymer for bonding the negative electrode of the lithium ion battery as claimed in claim 5, wherein: when R is3Represents a carbon number of C2～C6When the acyl group is (A), the molecular formula of the silane compound is shown as the formula V:
c is an integer, and c is more than or equal to 1 and less than or equal to 5; a is an integer, and a is more than or equal to 0 and less than or equal to 3.
8. The method for preparing the silane polymer for bonding the negative electrode of the lithium ion battery as claimed in claim 5, wherein: the silane compound is one of the following: vinyltrimethoxysilane, propenyltrimethoxysilane, butenyltrimethoxysilane, vinyltriethoxysilane, propenyltriethoxysilane, vinyltripropoxysilane, propenyltripropoxysilane, vinyltriisopropylsilane, propenyltriiopropylsilane, vinyltrimethylenesilane, propenyltrimethoxysilane, vinyltriacetoxysilane, propenyltriacetoxysilane, gamma-methacryloxymethyltrimethoxysilane, gamma-methacryloxymethyltriethoxysilane, propenyltrimethoxysilane, propenyltr, Gamma-methacryloyloxymethyltripropoxysilane, gamma-methacryloyloxyethyltrimethoxysilane, gamma-methacryloyloxyethyltriethoxysilane, gamma-methacryloyloxyethyltripropoxysilane, gamma-methacryloyloxypropyltrimethoxysilane, gamma-methacryloyloxypropyltriethoxysilane, gamma-methacryloyloxypropyltripropoxysilane, gamma-methacryloyloxytrimethyl-acid methyl ester silane, gamma-methacryloyloxytrimethyl-acid ethyl ester silane, gamma-methacryloyloxypropyl ester silane, gamma-methacryloyloxytrimethyl-acid propyl ester silane, gamma-methacryloyloxypropyl ester silane, gamma-methacryloyloxyethyl ester silane, Gamma-methacryloxytri-propyl ester silane, gamma-methacryloxytri-methyl ester silane, gamma-methacryloxytri-ethyl ester silane, gamma-methacryloxytri-propyl ester silane, vinyl dimethyl methoxy silane, propenyl dimethyl methoxy silane, butenyl methyl dimethoxy silane, vinyl methyl diethoxy silane, propenyl methyl dipropoxy silane, vinyl dimethyl iso-propyl silane, propenyl methyl di-iso-propyl silane, vinyl methyl diformate silane, propenyl dimethyl formate silane, vinyl diethyl formate silane, gamma-methacryloxy tri-ethyl ester silane, gamma-methacryloxytri-ethyl ester silane, gamma-methacrylo, Propenyl ethyl methyl dicarboxylate silane, gamma-methacryloxymethylethyl dimethoxysilane, gamma-methacryloxyethylmethyldimethoxysilane, gamma-methacryloxypropylmethyldimethoxysilane, gamma-methacryloxymethyl dicarboxylate silane, gamma-methacryloxyethyl dicarboxylate silane; vinyltrilactate silane, propenyltrimethylactate silane, vinyltrilactate silane, propenyltriethyllactate silane, vinyltrilactate silane, propenyltriprctate silane, vinyltributyl lactate silane, propenyltrimethylactate silane, gamma-methacryloyltrimethylactate silane, gamma-methacryloyltriacetylsilane, vinylmethyldialyllactalylsilane, propenylmethyldiethyl methyldialctate silane, propenylmethyldilactylsilane, propenyltriacetylsilane, propenyltrialkyi-propylsilane, propenyltrialyllactalysilane, propenyltrialyllactaly, Vinyl dimethyl propyl lactate silane, propenyl methyl propyl lactate silane, vinyl dimethyl butyl lactate silane, propenyl methyl butyl lactate silane, gamma-methacryloxy methyl lactate silane, gamma-methacryloxy ethyl lactate silane, gamma-methacryloxy dimethyl ethyl lactate silane, and gamma-methacryloxy dimethyl propyl lactate silane.
9. The method for preparing the silane polymer for bonding the negative electrode of the lithium ion battery according to claim 2, wherein the solvent is one or a mixture of two or more of the following solvents: propyl formate, butyl formate, ethyl acetate, propyl acetate, butyl acetate, methyl propionate, ethyl propionate, propyl propionate or butyl propionate.
10. The method for preparing the silane polymer for bonding the negative electrode of the lithium ion battery as claimed in claim 2, wherein the initiator is one of the following: azodiisobutyronitrile, azodiisoheptonitrile, benzoyl peroxide, isophenylhydroperoxide, tert-butyl hydroperoxide, dibenzoyl peroxide, benzoyl tert-butyl peroxide, cyclohexanone peroxide, diisopropyl peroxydicarbonate, potassium persulfate, sodium persulfate and ammonium persulfate.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113025235A (en) * | 2021-01-28 | 2021-06-25 | 江汉大学 | Lithium ion battery binder and preparation method and application thereof |
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Effective date of registration: 20240408 Address after: 441200 Taoyuan South Road and Fourth Ring Road West (Zaoyang Chemical Industry Park), Zaoyang City, Xiangyang City, Hubei Province Patentee after: Hubei Longsheng Sihai New Material Co.,Ltd. Country or region after: China Address before: 430000 Hubei University, 368 Wuchang Friendship Road, Wuchang District, Wuhan. Patentee before: Hubei University Country or region before: China |