JP7062205B2 - リチウム二次電池用電解質およびそれを含むリチウム二次電池 - Google Patents
リチウム二次電池用電解質およびそれを含むリチウム二次電池 Download PDFInfo
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- JP7062205B2 JP7062205B2 JP2020530378A JP2020530378A JP7062205B2 JP 7062205 B2 JP7062205 B2 JP 7062205B2 JP 2020530378 A JP2020530378 A JP 2020530378A JP 2020530378 A JP2020530378 A JP 2020530378A JP 7062205 B2 JP7062205 B2 JP 7062205B2
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- secondary battery
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- 229910052744 lithium Inorganic materials 0.000 title claims description 238
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims description 228
- 239000003792 electrolyte Substances 0.000 title claims description 136
- 239000007784 solid electrolyte Substances 0.000 claims description 106
- 239000000126 substance Substances 0.000 claims description 86
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- 229910003480 inorganic solid Inorganic materials 0.000 claims description 34
- 239000002245 particle Substances 0.000 claims description 34
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 claims description 29
- 229910001416 lithium ion Inorganic materials 0.000 claims description 28
- 239000003795 chemical substances by application Substances 0.000 claims description 21
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- 229910052782 aluminium Inorganic materials 0.000 claims description 15
- 229910052760 oxygen Inorganic materials 0.000 claims description 15
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- 238000000016 photochemical curing Methods 0.000 claims description 11
- 229910052732 germanium Inorganic materials 0.000 claims description 9
- 229910052698 phosphorus Inorganic materials 0.000 claims description 8
- 229910052785 arsenic Inorganic materials 0.000 claims description 7
- 229910052794 bromium Inorganic materials 0.000 claims description 7
- 229910052801 chlorine Inorganic materials 0.000 claims description 7
- 238000001723 curing Methods 0.000 claims description 7
- 229910052746 lanthanum Inorganic materials 0.000 claims description 7
- 229910052758 niobium Inorganic materials 0.000 claims description 7
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- 239000001257 hydrogen Substances 0.000 claims description 6
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- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- 229910052738 indium Inorganic materials 0.000 claims description 5
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- 229910012851 LiCoO 2 Inorganic materials 0.000 description 4
- 229910013870 LiPF 6 Inorganic materials 0.000 description 4
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 description 4
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- HFGPZNIAWCZYJU-UHFFFAOYSA-N lead zirconate titanate Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Ti+4].[Zr+4].[Pb+2] HFGPZNIAWCZYJU-UHFFFAOYSA-N 0.000 description 4
- 229910052451 lead zirconate titanate Inorganic materials 0.000 description 4
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- MQDJYUACMFCOFT-UHFFFAOYSA-N bis[2-(1-hydroxycyclohexyl)phenyl]methanone Chemical compound C=1C=CC=C(C(=O)C=2C(=CC=CC=2)C2(O)CCCCC2)C=1C1(O)CCCCC1 MQDJYUACMFCOFT-UHFFFAOYSA-N 0.000 description 1
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- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
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- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
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- 238000000354 decomposition reaction Methods 0.000 description 1
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- QWNFEDACBXJNSI-UHFFFAOYSA-N diethyl(methyl)azanium;trifluoromethanesulfonate Chemical compound CC[NH+](C)CC.[O-]S(=O)(=O)C(F)(F)F QWNFEDACBXJNSI-UHFFFAOYSA-N 0.000 description 1
- BXHHZLMBMOBPEH-UHFFFAOYSA-N diethyl-(2-methoxyethyl)-methylazanium Chemical compound CC[N+](C)(CC)CCOC BXHHZLMBMOBPEH-UHFFFAOYSA-N 0.000 description 1
- KDFUZGIURBWOQI-UHFFFAOYSA-N dimethyl(propyl)azanium trifluoromethanesulfonate Chemical compound CCC[NH+](C)C.[O-]S(=O)(=O)C(F)(F)F KDFUZGIURBWOQI-UHFFFAOYSA-N 0.000 description 1
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- QKBJDEGZZJWPJA-UHFFFAOYSA-N ethyl propyl carbonate Chemical compound [CH2]COC(=O)OCCC QKBJDEGZZJWPJA-UHFFFAOYSA-N 0.000 description 1
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- 239000003365 glass fiber Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052735 hafnium Inorganic materials 0.000 description 1
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- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
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- 239000007788 liquid Substances 0.000 description 1
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- 229910000664 lithium aluminum titanium phosphates (LATP) Inorganic materials 0.000 description 1
- 229910003473 lithium bis(trifluoromethanesulfonyl)imide Inorganic materials 0.000 description 1
- 229910000625 lithium cobalt oxide Inorganic materials 0.000 description 1
- HSZCZNFXUDYRKD-UHFFFAOYSA-M lithium iodide Inorganic materials [Li+].[I-] HSZCZNFXUDYRKD-UHFFFAOYSA-M 0.000 description 1
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- RSNHXDVSISOZOB-UHFFFAOYSA-N lithium nickel Chemical compound [Li].[Ni] RSNHXDVSISOZOB-UHFFFAOYSA-N 0.000 description 1
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- 159000000002 lithium salts Chemical group 0.000 description 1
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- VDVLPSWVDYJFRW-UHFFFAOYSA-N lithium;bis(fluorosulfonyl)azanide Chemical compound [Li+].FS(=O)(=O)[N-]S(F)(=O)=O VDVLPSWVDYJFRW-UHFFFAOYSA-N 0.000 description 1
- QSZMZKBZAYQGRS-UHFFFAOYSA-N lithium;bis(trifluoromethylsulfonyl)azanide Chemical compound [Li+].FC(F)(F)S(=O)(=O)[N-]S(=O)(=O)C(F)(F)F QSZMZKBZAYQGRS-UHFFFAOYSA-N 0.000 description 1
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- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
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- CXHHBNMLPJOKQD-UHFFFAOYSA-M methyl carbonate Chemical compound COC([O-])=O CXHHBNMLPJOKQD-UHFFFAOYSA-M 0.000 description 1
- YLHXLHGIAMFFBU-UHFFFAOYSA-N methyl phenylglyoxalate Chemical compound COC(=O)C(=O)C1=CC=CC=C1 YLHXLHGIAMFFBU-UHFFFAOYSA-N 0.000 description 1
- 229940017219 methyl propionate Drugs 0.000 description 1
- KKQAVHGECIBFRQ-UHFFFAOYSA-N methyl propyl carbonate Chemical compound CCCOC(=O)OC KKQAVHGECIBFRQ-UHFFFAOYSA-N 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
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- 229910052714 tellurium Inorganic materials 0.000 description 1
- 229920006027 ternary co-polymer Polymers 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- ZUHZGEOKBKGPSW-UHFFFAOYSA-N tetraglyme Chemical compound COCCOCCOCCOCCOC ZUHZGEOKBKGPSW-UHFFFAOYSA-N 0.000 description 1
- 125000002023 trifluoromethyl group Chemical group FC(F)(F)* 0.000 description 1
- CBIQXUBDNNXYJM-UHFFFAOYSA-N tris(2,2,2-trifluoroethyl) phosphite Chemical compound FC(F)(F)COP(OCC(F)(F)F)OCC(F)(F)F CBIQXUBDNNXYJM-UHFFFAOYSA-N 0.000 description 1
- NQPDZGIKBAWPEJ-UHFFFAOYSA-N valeric acid Chemical compound CCCCC(O)=O NQPDZGIKBAWPEJ-UHFFFAOYSA-N 0.000 description 1
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- PAPBSGBWRJIAAV-UHFFFAOYSA-N ε-Caprolactone Chemical compound O=C1CCCCCO1 PAPBSGBWRJIAAV-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
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Description
本発明に係るリチウム二次電池用電解質は、ポリマーと、無機固体電解質粒子および強誘電体からなる群から選択される1つ以上と、を含む。前記ポリマーは、下記化学式1で表されるポリマー、および下記化学式2で表される繰り返し単位を含むポリマーからなる群から選択される1つ以上を含む。
次に、本発明に係るリチウム二次電池用電解質の製造方法について説明する。
有機溶媒と、ポリマーと、無機固体電解質粒子および強誘電体からなる群から選択される1つ以上と、を含むリチウム二次電池用電解質用組成物を製造する。この際、前記ポリマー、無機固体電解質粒子、および強誘電体についての記載は、上記記載の内容と同様であるため省略する。
次に、リチウム二次電池用電解質用組成物をコーティングするステップについて説明する。前記コーティング方法としては、通常のコーティング方法が使用でき、例えば、バーコーティング、スピンコーティング、ロールコーティング、スロットダイコーティング、ハンドコーティング、スプレーコーティングなどが挙げられ、このうち1種の方法を単独で用いてもよく、2種以上の方法を併せて用いてもよい。
次に、前記コーティングされたリチウム二次電池用電解質用組成物を乾燥し、組成物中に含まれていた有機溶媒を除去する。
ゲル電解質を製造しようとする場合、前記(3)ステップを経てリチウム二次電池用電解質用組成物を乾燥または乾燥および硬化させた後、非水電解液にそれを含浸させるステップをさらに含む。
一方、本発明は、前記リチウム二次電池用電解質を含むリチウム二次電池を提供する。より具体的には、前記リチウム二次電池は、正極と、負極と、電解質と、を含み、必要に応じて、セパレータをさらに含む。この際、正極、負極、およびセパレータの少なくとも1つ以上の一面または両面に、本発明に係るリチウム二次電池用電解質が介在されるか、その一面または両面上に形成される。前記リチウム二次電池用電解質は、固体電解質またはゲル電解質であってもよい。
1.実施例1
(1)電極の製造
正極活物質として、4.2V級のLiCoO2化合物94重量%、導電材としてカーボンブラック4重量%、バインダー成分としてポリビニリデンフルオライド(PVDF)2重量%を、溶剤であるN-メチル-2-ピロリドン(以下、NMP)に添加して正極活物質スラリー(固形分の含量90重量%)を製造した。
有機溶媒(NMP)90gに、化学式1bで表されるポリマー(重量平均分子量(Mw)=50,000、a2=380、b2=380、c2=380)4g、無機固体電解質粒子(LLZO)6gを投入した後、光硬化剤としてHMPP(2-ヒドロキシ-2-メチルプロピオフェノン)0.08gをさらに投入して撹拌し、リチウム二次電池用電解質用組成物を製造した後、前記負極極板の一表面に前記リチウム二次電池用電解質用組成物を塗布し、乾燥して有機溶媒(NMP)を全て除去した。その後、UV雰囲気で2分間露出させて硬化し、負極極板に厚さ50μmの固体電解質を形成した。
前記製造された正極、および固体電解質が形成された負極を、前記固体電解質が前記正極と向い合うように順に積層して電極組立体を製造した後、前記電極組立体をパウチ形の電池ケースに収納することで、4.2V級のリチウム二次電池(Full cell)を製造した。
リチウム二次電池用固体電解質の製造時に、前記リチウム二次電池用電解質用組成物に、無機固体電解質粒子としてLLZOの代わりにLGPS(Li10GeP2S12)を6g投入したことを除き、実施例1と同様の方法によりリチウム二次電池用固体電解質およびそれを含むリチウム二次電池を製造した。
リチウム二次電池用固体電解質の製造時に、前記リチウム二次電池用電解質用組成物に、無機固体電解質粒子(LLZO)の代わりに強誘電体としてBaTiO3を6g投入したことを除き、実施例1と同様の方法によりリチウム二次電池用固体電解質およびそれを含むリチウム二次電池を製造した。
リチウム二次電池用固体電解質の製造時に、前記化学式1bで表されるポリマーの代わりに、化学式1cで表されるポリマー(重量平均分子量(Mw)=100,000)を4g投入したことを除き、実施例1と同様の方法によりリチウム二次電池用固体電解質およびそれを含むリチウム二次電池を製造した。
リチウム二次電池用固体電解質の製造時に、リチウム二次電池用電解質用組成物に、酸素抑制剤としてTFEPiを1重量%さらに投入したことを除き、実施例4と同様の方法によりリチウム二次電池用固体電解質およびそれを含むリチウム二次電池を製造した。
リチウム二次電池用固体電解質の製造時に、有機溶媒(NMP)99gに、化学式2a-2で表される繰り返し単位を含むポリマー(重量平均分子量(Mw)=100,000、m12=600、n12=150、m12:n12=4:1)1g、無機固体電解質粒子LLZOを1.5g投入して撹拌し、リチウム二次電池用電解質用組成物を製造した後、前記負極極板の一表面に前記リチウム二次電池用電解質用組成物を塗布し、有機溶媒(NMP)を全て除去することで、負極極板に厚さ30μmのリチウム二次電池用固体電解質を形成した。
リチウム二次電池用固体電解質の製造時に、前記リチウム二次電池用電解質用組成物に、無機固体電解質粒子としてLLZOの代わりにLGPS(Li10GeP2S12)を1.5g投入したことを除き、実施例6と同様の方法によりリチウム二次電池用固体電解質およびそれを含むリチウム二次電池を製造した。
リチウム二次電池用固体電解質の製造時に、前記リチウム二次電池用電解質用組成物に、無機固体電解質粒子(LLZO)の代わりに、強誘電体としてBaTiO3を1.5g投入したことを除き、実施例6と同様の方法によりリチウム二次電池用固体電解質およびそれを含むリチウム二次電池を製造した。
リチウム二次電池用固体電解質の製造時に、前記化学式2a-2で表される繰り返し単位を含むポリマーの代わりに、化学式2a-3で表される繰り返し単位を含むポリマー(重量平均分子量(Mw)=50,000、m13=320、n13=80、m13:n13=4:1)1gを投入したことを除き、実施例6と同様の方法によりリチウム二次電池用固体電解質およびそれを含むリチウム二次電池を製造した。
リチウム二次電池用固体電解質の製造時に、前記リチウム二次電池用電解質用組成物に、無機固体電解質粒子LLZOを4g投入したことを除き、実施例6と同様の方法によりリチウム二次電池用固体電解質およびそれを含むリチウム二次電池を製造した。
リチウム二次電池用固体電解質の製造時に、前記リチウム二次電池用電解質用組成物に、無機固体電解質粒子LGPSを4g投入したことを除き、実施例7と同様の方法によりリチウム二次電池用固体電解質およびそれを含むリチウム二次電池を製造した。
リチウム二次電池用固体電解質の製造時に、前記リチウム二次電池用電解質用組成物に、強誘電体BaTiO3を4g投入したことを除き、実施例8と同様の方法によりリチウム二次電池用固体電解質およびそれを含むリチウム二次電池を製造した。
リチウム二次電池用固体電解質の製造時に、前記化学式1bで表されるポリマーの代わりに、直鎖状のポリエチレンオキサイド共重合体(L-PEO、重量平均分子量(Mw)=100,000)を4g使用したことを除き、前記実施例1と同様の方法によりリチウム二次電池用固体電解質およびそれを含むリチウム二次電池を製造した。
リチウム二次電池用固体電解質の製造時に、有機溶媒(NMP)90gに、化学式1bで表されるポリマー(重量平均分子量(Mw)=50,000、a1=380、b1=380、c1=380)10gを投入した後、光硬化剤としてHMPP(2-ヒドロキシ-2-メチルプロピオフェノン)0.08gをさらに投入して撹拌し、リチウム二次電池用電解質用組成物を製造したことを除き、実施例1と同様の方法によりリチウム二次電池用固体電解質およびそれを含むリチウム二次電池を製造した。
リチウム二次電池用固体電解質の製造時に、前記化学式2a-2で表される繰り返し単位を含むポリマーの代わりに、直鎖状のポリエチレングリコール共重合体(L-PEO、重量平均分子量(Mw)=100,000)を1g使用したことを除き、前記実施例6と同様の方法によりリチウム二次電池用固体電解質およびそれを含むリチウム二次電池を製造した。
リチウム二次電池用固体電解質の製造時に、前記リチウム二次電池用電解質用組成物に、無機固体電解質粒子LLZO1.5gを投入していないことを除き、実施例6と同様の方法によりリチウム二次電池用固体電解質およびそれを含むリチウム二次電池を製造した。
1.実施例13
(1)電極の製造
正極活物質として、4.2V級のLiCoO2化合物94重量%、導電材としてカーボンブラック4重量%、バインダー成分としてPvDF2重量%を、溶剤であるN-メチル-2-ピロリドン(NMP)に添加して正極活物質スラリー(固形分の含量90重量%)を製造した。
NMP95gに、化学式1bで表されるポリマー(重量平均分子量(Mw)=50,000、a2=380、b2=380、c2=380)2g、無機固体電解質粒子(LLZO)3gを投入した後、光硬化剤としてHMPP(2-ヒドロキシ-2-メチルプロピオフェノン)0.04gをさらに投入して撹拌し、リチウム二次電池用電解質用組成物を製造した後、前記負極極板の一表面に前記電解質用組成物を塗布し、乾燥して有機溶媒(NMP)を全て除去した。その後、UV雰囲気で2分間露出させて硬化し、負極極板に厚さ1μmの固体電解質を形成した。
リチウム二次電池用電解質用組成物に、無機固体電解質粒子としてLLZOの代わりにLGPS(Li10GeP2S12)を3g投入したことを除き、実施例13と同様の方法によりリチウム二次電池用ゲル電解質およびそれを含むリチウム二次電池を製造した。
リチウム二次電池用電解質用組成物に、無機固体電解質粒子(LLZO)の代わりに、強誘電体としてBaTiO3を3g投入したことを除き、実施例13と同様の方法によりリチウム二次電池用ゲル電解質およびそれを含むリチウム二次電池を製造した。
リチウム二次電池用電解質用組成物に、前記化学式1bで表されるポリマーの代わりに、化学式1cで表されるポリマー(重量平均分子量(Mw)=100,000)2gを投入したことを除き、実施例13と同様の方法によりリチウム二次電池用ゲル電解質およびそれを含むリチウム二次電池を製造した。
リチウム二次電池用電解質用組成物に、酸素抑制剤としてTFEPiを1重量%さらに投入したことを除き、実施例13と同様の方法によりリチウム二次電池用ゲル電解質およびそれを含むリチウム二次電池を製造した。
リチウム二次電池の製造時に、前記非水電解液を注液した後にイオン性液体(Pyr13-FSI)100μlをさらに注液したことを除き、前記実施例13と同様の方法によりリチウム二次電池用ゲル電解質およびそれを含むリチウム二次電池を製造した。
NMP99gに、化学式2a-2で表される繰り返し単位を含むポリマー(重量平均分子量(Mw)100,000、m12=600、n12=150、m12:n12=4:1)1g、無機固体電解質粒子(LLZO)1.5gを投入して撹拌し、リチウム二次電池用電解質用組成物を製造した後、前記負極極板の一表面に前記リチウム二次電池用電解質用組成物を塗布し、有機溶媒(NMP)を全て除去することで、負極極板に厚さ1.0μmの固体電解質を形成した。
リチウム二次電池用電解質用組成物に、無機固体電解質粒子としてLLZOの代わりにLGPSを1.5g投入したことを除き、実施例19と同様の方法によりリチウム二次電池用ゲル電解質およびそれを含むリチウム二次電池を製造した。
リチウム二次電池用電解質組成物に、無機固体電解質粒子LLZO1.5gの代わりに、強誘電体としてBaTiO3を1.5g投入したことを除き、実施例19と同様の方法によりリチウム二次電池用ゲル電解質およびそれを含むリチウム二次電池を製造した。
リチウム二次電池用電解質組成物に、前記化学式2a-2で表される繰り返し単位を含むポリマー(重量平均分子量(Mw)=100,000、m12=600、n12=150、m12:n12=4:1)1gの代わりに、化学式2a-3で表される繰り返し単位を含むポリマー(重量平均分子量(Mw)=50,000、m13=320、n13=80、m13:n13=4:1)を1g投入したことを除き、実施例19と同様の方法によりリチウム二次電池用ゲル電解質およびそれを含むリチウム二次電池を製造した。
リチウム二次電池用電解質用組成物に、無機固体電解質粒子LLZOを4g投入したことを除き、実施例19と同様の方法によりリチウム二次電池用ゲル電解質およびそれを含むリチウム二次電池を製造した。
リチウム二次電池用電解質用組成物に、無機固体電解質粒子LGPSを4g投入したことを除き、実施例19と同様の方法によりリチウム二次電池用ゲル電解質およびそれを含むリチウム二次電池を製造した。
リチウム二次電池用電解質用組成物に、強誘電体としてBaTiO3を4g投入したことを除き、実施例19と同様の方法によりリチウム二次電池用ゲル電解質およびそれを含むリチウム二次電池を製造した。
前記実施例19において、リチウム二次電池の製造時に、前記非水電解液を注液した後、イオン性液体(Pyr13-FSI)140μlをさらに注液したことを除き、前記実施例19と同様の方法によりリチウム二次電池用ゲル電解質およびそれを含むリチウム二次電池を製造した。
リチウム二次電池用電解質用組成物に、前記化学式1bで表されるポリマーの代わりに直鎖状のポリエチレンオキサイド共重合体(L-PEO、重量平均分子量(Mw)=100,000)を2g使用したことを除き、前記実施例13と同様の方法によりリチウム二次電池用ゲル電解質およびリチウム二次電池を製造した。
有機溶媒(NMP)95gに、化学式1bで表されるポリマー(重量平均分子量(Mw)=50,000、a2=380、b2=380、c2=380)5gを投入した後、光硬化剤としてHMPP(2-ヒドロキシ-2-メチルプロピオフェノン)0.04gをさらに投入して撹拌し、リチウム二次電池用電解質用組成物を製造したことを除き、前記実施例13と同様の方法によりリチウム二次電池用ゲル電解質およびリチウム二次電池を製造した。
リチウム二次電池用電解質用組成物に、前記化学式2a-2で表される繰り返し単位を含むポリマーの代わりに、直鎖状のポリエチレングリコール共重合体(L-PEO、重量平均分子量(Mw)=100,000)を1g使用したことを除き、前記実施例19と同様の方法によりリチウム二次電池用ゲル電解質およびそれを含むリチウム二次電池を製造した。
リチウム二次電池用電解質用組成物に、無機固体電解質粒子LLZO1.5gを投入していないことを除き、前記実施例19と同様の方法によりリチウム二次電池用ゲル電解質およびそれを含むリチウム二次電池を製造した。
1.実験例1.リチウム二次電池用固体電解質の機械的強度の評価
実施例1~12で製造されたリチウム二次電池用固体電解質と、比較例1~4で製造されたリチウム二次電池用固体電解質に対して、引張強度の測定による機械的強度実験を行った。
実施例および比較例で製造された電解質の上部に、金(Au)電極を直径1mmの円形としてスパッタ(sputter)法によりコーティングした後、25℃で交流インピーダンス測定法によりイオン伝導度を測定した。前記イオン伝導度は、VMP3測定装備および4294Aを用いて、周波数帯域100MHz~0.1Hzで測定した。測定結果を表2に示した。
前記実施例および比較例で製造されたリチウム二次電池をフォーメーション(formation)させた後、それぞれ常温(25℃)の温度条件で、0.2C/0.5Cの充/放電速度で、1回の充/放電を行った。この際、1回充/放電された状態を初期容量とし、前記初期容量に対する容量維持率(Capacity retention)が80%を維持する時点でのサイクル数(n)を測定し、その値をそれぞれ下記表3に示した。
前記実施例および比較例で製造されたリチウム二次電池をフォーメーション(formation)させた後、それぞれ45℃で、0.2C/0.5Cの充/放電速度で、1回の充/放電を行った。この際、1回充/放電された状態を初期容量とし、前記初期容量に対する容量維持率(Capacity retention)が80%を維持する時点でのサイクル数(n)を測定し、その値をそれぞれ下記表4に示した。
実施例6~12、比較例3および4で製造されたリチウム二次電池に対して、8Vまで直線走査ボルタンメトリー法(Linear sweep voltammetry、LSV)または循環ボルタンメトリー法(Cyclic voltammetry)により、高温(60℃)での酸化開始電圧を測定した。その結果を下記表5に示した。
Claims (8)
- 前記化学式1で表されるポリマーは、光硬化剤および熱硬化剤からなる群から選択される1つ以上の硬化剤を用いて架橋されたものである、請求項1または2に記載のリチウム二次電池用電解質。
- 固体電解質またはゲル電解質である、請求項1から3の何れか一項に記載のリチウム二次電池用電解質。
- 前記無機固体電解質粒子は、Li、La、Zr、O、Ti、Al、Ge、P、W、Nb、Te、Ln、Si、Nd、N、S、Ba、Ga、In、F、Cl、Br、I、As、Se、Sb、Sn、およびRuからなる群から選択される少なくとも1つ以上の元素を含む、請求項1から4の何れか一項に記載のリチウム二次電池用電解質。
- 前記強誘電体は、Li、La、O、Ti、Ge、P、Nb、Te、Ba、K、H、D、Ta、Bi、Pb、Rb、およびAsからなる群から選択される少なくとも1つ以上の元素を含む、請求項1から5の何れか一項に記載のリチウム二次電池用電解質。
- 前記無機固体電解質粒子および強誘電体からなる群から選択される1つ以上は、ポリマー100重量部に対して10重量部~900重量部で含まれる、請求項1から6の何れか一項に記載のリチウム二次電池用電解質。
- 請求項1から7の何れか一項に記載のリチウム二次電池用電解質を含むリチウム二次電池。
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