JP2020087711A - 無機固体電解質二次電池 - Google Patents
無機固体電解質二次電池 Download PDFInfo
- Publication number
- JP2020087711A JP2020087711A JP2018220614A JP2018220614A JP2020087711A JP 2020087711 A JP2020087711 A JP 2020087711A JP 2018220614 A JP2018220614 A JP 2018220614A JP 2018220614 A JP2018220614 A JP 2018220614A JP 2020087711 A JP2020087711 A JP 2020087711A
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- JP
- Japan
- Prior art keywords
- solid electrolyte
- inorganic solid
- secondary battery
- electrolyte secondary
- crosslinked film
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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- 239000007784 solid electrolyte Substances 0.000 title claims abstract description 109
- 229910003480 inorganic solid Inorganic materials 0.000 title claims abstract description 96
- -1 lithium salt compound Chemical class 0.000 claims abstract description 66
- 229920001940 conductive polymer Polymers 0.000 claims abstract description 30
- 229910003002 lithium salt Inorganic materials 0.000 claims abstract description 28
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical group C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000000203 mixture Substances 0.000 claims abstract description 19
- 150000002500 ions Chemical class 0.000 claims description 35
- 229910003473 lithium bis(trifluoromethanesulfonyl)imide Inorganic materials 0.000 claims description 6
- 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 claims description 6
- 229910013063 LiBF 4 Inorganic materials 0.000 claims description 3
- 229910013684 LiClO 4 Inorganic materials 0.000 claims description 3
- 229910010941 LiFSI Inorganic materials 0.000 claims description 3
- 229910013870 LiPF 6 Inorganic materials 0.000 claims description 3
- VDVLPSWVDYJFRW-UHFFFAOYSA-N lithium;bis(fluorosulfonyl)azanide Chemical compound [Li+].FS(=O)(=O)[N-]S(F)(=O)=O VDVLPSWVDYJFRW-UHFFFAOYSA-N 0.000 claims description 3
- 239000002203 sulfidic glass Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 description 19
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 description 18
- 239000003999 initiator Substances 0.000 description 16
- WEVYAHXRMPXWCK-UHFFFAOYSA-N Acetonitrile Chemical compound CC#N WEVYAHXRMPXWCK-UHFFFAOYSA-N 0.000 description 15
- 150000001875 compounds Chemical class 0.000 description 14
- 239000007774 positive electrode material Substances 0.000 description 14
- 229910052782 aluminium Inorganic materials 0.000 description 13
- 239000007773 negative electrode material Substances 0.000 description 12
- 239000002245 particle Substances 0.000 description 11
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 10
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 10
- 239000004721 Polyphenylene oxide Substances 0.000 description 10
- 239000011248 coating agent Substances 0.000 description 10
- 238000000576 coating method Methods 0.000 description 10
- 229910052732 germanium Inorganic materials 0.000 description 10
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- 239000010936 titanium Substances 0.000 description 10
- 239000011149 active material Substances 0.000 description 9
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- 239000002184 metal Substances 0.000 description 9
- 150000003839 salts Chemical class 0.000 description 9
- 238000004132 cross linking Methods 0.000 description 8
- 238000012360 testing method Methods 0.000 description 8
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- 239000002562 thickening agent Substances 0.000 description 7
- STMDPCBYJCIZOD-UHFFFAOYSA-N 2-(2,4-dinitroanilino)-4-methylpentanoic acid Chemical compound CC(C)CC(C(O)=O)NC1=CC=C([N+]([O-])=O)C=C1[N+]([O-])=O STMDPCBYJCIZOD-UHFFFAOYSA-N 0.000 description 6
- LKMJVFRMDSNFRT-UHFFFAOYSA-N 2-(methoxymethyl)oxirane Chemical compound COCC1CO1 LKMJVFRMDSNFRT-UHFFFAOYSA-N 0.000 description 6
- OMPJBNCRMGITSC-UHFFFAOYSA-N Benzoylperoxide Chemical compound C=1C=CC=CC=1C(=O)OOC(=O)C1=CC=CC=C1 OMPJBNCRMGITSC-UHFFFAOYSA-N 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
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- 239000004014 plasticizer Substances 0.000 description 6
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- 239000003792 electrolyte Substances 0.000 description 5
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- 239000003054 catalyst Substances 0.000 description 4
- 238000007600 charging Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- 239000013078 crystal Substances 0.000 description 4
- 239000011267 electrode slurry Substances 0.000 description 4
- 229910010272 inorganic material Inorganic materials 0.000 description 4
- 239000011147 inorganic material Substances 0.000 description 4
- 239000003960 organic solvent Substances 0.000 description 4
- 229910052698 phosphorus Inorganic materials 0.000 description 4
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- 150000001450 anions Chemical class 0.000 description 3
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- 238000007599 discharging Methods 0.000 description 3
- 150000002170 ethers Chemical class 0.000 description 3
- VOZRXNHHFUQHIL-UHFFFAOYSA-N glycidyl methacrylate Chemical compound CC(=C)C(=O)OCC1CO1 VOZRXNHHFUQHIL-UHFFFAOYSA-N 0.000 description 3
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- 229910052738 indium Inorganic materials 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 229910052758 niobium Inorganic materials 0.000 description 3
- RPQRDASANLAFCM-UHFFFAOYSA-N oxiran-2-ylmethyl prop-2-enoate Chemical compound C=CC(=O)OCC1CO1 RPQRDASANLAFCM-UHFFFAOYSA-N 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 229910052697 platinum Inorganic materials 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 229910052717 sulfur Inorganic materials 0.000 description 3
- 229910052723 transition metal Inorganic materials 0.000 description 3
- 150000003624 transition metals Chemical class 0.000 description 3
- 229910052720 vanadium Inorganic materials 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- KUDUQBURMYMBIJ-UHFFFAOYSA-N 2-prop-2-enoyloxyethyl prop-2-enoate Chemical compound C=CC(=O)OCCOC(=O)C=C KUDUQBURMYMBIJ-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- RAXXELZNTBOGNW-UHFFFAOYSA-O Imidazolium Chemical compound C1=C[NH+]=CN1 RAXXELZNTBOGNW-UHFFFAOYSA-O 0.000 description 2
- 239000002227 LISICON Substances 0.000 description 2
- 229910012329 Li3BO3—Li2SO4 Inorganic materials 0.000 description 2
- 229910019142 PO4 Inorganic materials 0.000 description 2
- JUJWROOIHBZHMG-UHFFFAOYSA-N Pyridine Chemical compound C1=CC=NC=C1 JUJWROOIHBZHMG-UHFFFAOYSA-N 0.000 description 2
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 2
- 239000006230 acetylene black Substances 0.000 description 2
- 229920000800 acrylic rubber Polymers 0.000 description 2
- 229910001413 alkali metal ion Inorganic materials 0.000 description 2
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
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- 239000002134 carbon nanofiber Substances 0.000 description 2
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- 239000001768 carboxy methyl cellulose Substances 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 229910017052 cobalt Inorganic materials 0.000 description 2
- 239000010941 cobalt Substances 0.000 description 2
- GSOLWAFGMNOBSY-UHFFFAOYSA-N cobalt Chemical compound [Co][Co][Co][Co][Co][Co][Co][Co] GSOLWAFGMNOBSY-UHFFFAOYSA-N 0.000 description 2
- 238000010281 constant-current constant-voltage charging Methods 0.000 description 2
- GYZLOYUZLJXAJU-UHFFFAOYSA-N diglycidyl ether Chemical compound C1OC1COCC1CO1 GYZLOYUZLJXAJU-UHFFFAOYSA-N 0.000 description 2
- 238000007606 doctor blade method Methods 0.000 description 2
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- 238000005227 gel permeation chromatography Methods 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
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- 125000005843 halogen group Chemical group 0.000 description 2
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- KWGKDLIKAYFUFQ-UHFFFAOYSA-M lithium chloride Chemical compound [Li+].[Cl-] KWGKDLIKAYFUFQ-UHFFFAOYSA-M 0.000 description 2
- 229910001386 lithium phosphate Inorganic materials 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- LBSANEJBGMCTBH-UHFFFAOYSA-N manganate Chemical compound [O-][Mn]([O-])(=O)=O LBSANEJBGMCTBH-UHFFFAOYSA-N 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000000034 method Methods 0.000 description 2
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- BFZPBUKRYWOWDV-UHFFFAOYSA-N lithium;oxido(oxo)cobalt Chemical compound [Li+].[O-][Co]=O BFZPBUKRYWOWDV-UHFFFAOYSA-N 0.000 description 1
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- 239000011255 nonaqueous electrolyte Substances 0.000 description 1
- BTNXBLUGMAMSSH-UHFFFAOYSA-N octanedinitrile Chemical compound N#CCCCCCCC#N BTNXBLUGMAMSSH-UHFFFAOYSA-N 0.000 description 1
- AVNANMSIFNUHNY-MQQKCMAXSA-N oxiran-2-ylmethyl (2e,4e)-hexa-2,4-dienoate Chemical compound C\C=C\C=C\C(=O)OCC1CO1 AVNANMSIFNUHNY-MQQKCMAXSA-N 0.000 description 1
- JUVGLPRIQOJMIR-UHFFFAOYSA-N oxiran-2-ylmethyl 3-phenylprop-2-enoate Chemical compound C=1C=CC=CC=1C=CC(=O)OCC1CO1 JUVGLPRIQOJMIR-UHFFFAOYSA-N 0.000 description 1
- NZSXYXVUIOHHSF-UHFFFAOYSA-N oxiran-2-ylmethyl hex-4-enoate Chemical compound CC=CCCC(=O)OCC1CO1 NZSXYXVUIOHHSF-UHFFFAOYSA-N 0.000 description 1
- 125000006353 oxyethylene group Chemical group 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 239000004584 polyacrylic acid Chemical class 0.000 description 1
- 239000002685 polymerization catalyst Substances 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 229920002451 polyvinyl alcohol Chemical class 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- IRAPFUAOCHNONS-UHFFFAOYSA-N potassium;phenylmethylbenzene Chemical compound [K+].C=1C=CC=CC=1[CH-]C1=CC=CC=C1 IRAPFUAOCHNONS-UHFFFAOYSA-N 0.000 description 1
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- UMJSCPRVCHMLSP-UHFFFAOYSA-N pyridine Natural products COC1=CC=CN=C1 UMJSCPRVCHMLSP-UHFFFAOYSA-N 0.000 description 1
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- 238000007151 ring opening polymerisation reaction Methods 0.000 description 1
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Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Secondary Cells (AREA)
Abstract
Description
項1. 正極、無機固体電解質、負極、及び架橋フィルムを備える、無機固体電解質二次電池であって、
前記架橋フィルムは、リチウム塩化合物、及び側鎖にエチレンオキシド単位を有するイオン伝導性ポリマーを含む組成物の架橋体であり、
前記正極と前記無機固体電解質との間、及び前記負極と前記無機固体電解質との間の少なくとも一方に、前記架橋フィルムを有する、無機固体電解質二次電池。
項2. 前記リチウム塩化合物は、LiBF4、LiPF6、LiClO4、LiCF3SO3、LiN(CF3SO2)2(LiTFSI)、LiN(SFO2)2(LiFSI)、LiN(C2F5SO2)2、及びLiN[CF3SC(C2F5SO2)3]2からなる群より選択される少なくとも1種である、項1に記載の無機固体電解質二次電池。
項3. 前記無機固体電解質と、前記架橋フィルムとが接触している、項1または2に記載の無機固体電解質二次電池。
項4. 前記無機固体電解質は、酸化物系固体電解質又は硫化物系固体電解質である、項1〜3のいずれか1項に記載の無機固体電解質二次電池。
正極、架橋フィルム、無機固体電解質、架橋フィルム、及び負極が順に積層された積層構成;
正極、架橋フィルム、無機固体電解質、及び負極が順に積層された積層構成;
正極、無機固体電解質、架橋フィルム、及び負極が順に積層された積層構成。
本発明の無機固体電解質二次電池の製造方法は特に限定されず、少なくとも、正極、負極、無機固体電解質、及び架橋フィルムで構成され、公知の方法にて製造される。例えば、コイン型のリチウムイオン電池の場合、正極、無機固体電解質、負極、さらに、正極と無機固体電解質との間、及び、負極と無機固体電解質との間の少なくとも一方に架橋フィルムを配置して、外装缶に挿入する。その後、封口体とタブ溶接などで接合して、封口体を封入し、カシめることで蓄電池が得られる。電池の形状は限定されないが、例としてはコイン型、円筒型、シート型などがあげられ、2個以上の電池を積層した構造でもよい。
作製した電池の評価としては充放電装置を用いて充放電試験を行い、充電容量および放電容量を求めた。
0.1C(10時間率)に相当する電流で4.2VまでCCCV充電(0.01Cカット)後、0.1Cに相当する電流で、2.5VまでCCCV放電(0.01Cカット)を行った。試験温度は100℃環境とした。
[正極の実施作製例]
(1)正極活物質としてNCM(ニッケル/コバルト/マンガン酸リチウム=5/2/3)100質量部に、導電助剤としてアセチレンブラック3質量部、黒鉛3質量部、バインダーとしてPVdF3質量部を加え、さらにスラリーの固形分濃度が35質量%となるようにNMP溶液中に加えて、十分に混合して正極用スラリーを得た。得られた正極スラリーを厚さ20μmのアルミ集電体上にダイコーターを用いて塗布し、100℃で12時間以上乾繰後、ロールプレス機にてプレスを行い、厚さ20μmの無機固体電解質二次電池用正極の前駆体を作製した(目付量 6.6mg/cm2、正極密度 3.1g/cm3、空隙率 26%)。
(1)負極活物質として人造黒鉛(粒径10μm) 100質量部に、導電助剤として気相成長炭素繊維(VGCF)2質量部、バインダーとしてSBR 3質量部、増粘剤としてカルボキシメチルセルロースのナトリウム塩 2質量部を加え、さらにスラリーの固形分濃度が35質量%となるように水を加えて、十分に混合して負極用スラリーを得た。得られた負極スラリーを厚さ16.5μmの銅集電体上にダイコーターを用いて塗布し、100℃で12時間以上乾繰後、ロールプレス機にてプレスを行い、厚さ22μmの無機固体電解質二次電池用負極の前駆体を作製した(目付量3.1mg/cm2、負極密度1.2g/cm3、空隙率23%)。
イオン伝導性ポリマーとしてエチレンオキシド/ジエチレングリコールメチルグリシジルエーテル/アリルグリシジルエーテル=80/17/3モル%三元共重合体(重量平均分子量150万)100質量部、リチウム塩化合物としてLiTFSI 38質量部を、架橋助剤として、トリメチロールプロパントリアクリレート10質量部、ラジカル開始剤としてベンゾイルパーオキシド(ナイパーBMT、日油株式会社製)0.3質量部をアセトニトリル900質量部に完全に溶解させて塗工溶液を調製した。この塗工溶液をPETフィルム上に塗工、乾燥後、100℃、2時間、減圧下で熱架橋を行い、厚さ20μmの架橋フィルムを得た。
ポリエチレンオキシド(重量平均分子量110万)100質量部、リチウム塩化合物としてLiTFSI 38質量部をアセトニトリル900質量部に完全に溶解させて塗工溶液を調製した。この塗工溶液をPETフィルム上に塗工、乾燥後、厚さ30μmのリチウム塩化合物を含むポリエチレンオキシドフィルムを得た。
[無機固体電解質二次電池の実施製造例1]
ドライルーム内において、無機固体電解質二次電池用正極の実施作製例で得た正極、実施作製例の架橋フィルム、無機固体電解質としてLi7La3Zr2O12(LLZ, 豊島製作所製 膜厚500μm)、実施作製例の架橋フィルム、負極としての金属リチウム箔の順に積層後、カシめ、試験用2032型コイン電池を製造した。
<充放電条件>
下限電圧2.5V−上限電圧4.2V、100℃
CC(0.1C)−CV(0.01C)充電
CC(0.1C)−CV(0.01C)放電
<充放電試験結果>
充電容量168mAh/g、放電容量162mAh/g
ドライルーム内において、無機固体電解質二次電池用正極の実施作製例で得た正極、実施作製例の架橋フィルム、無機固体電解質としてLi7La3Zr2O12(LLZ, 豊島製作所製 膜厚500μm)、実施作製例の架橋フィルム、無機固体電解質二次電池用負極の実施作製例で得た負極の順に積層後、カシめ、試験用2032型コイン電池を製造した。
<充放電条件>
下限電圧2.5V−上限電圧4.2V、100℃
CC(0.1C)−CV(0.01C)充電
CC(0.1C)−CV(0.01C)放電
<充放電試験結果>
充電容量135mAh/g、放電容量122mAh/g
実施作製例の架橋フィルムの代わりに、比較例のポリエチレンオキシドフィルムを用いたこと以外は、実施製造例1と同様にして、試験用2032型コイン電池を製造した。
<充放電条件>
下限電圧2.5V−上限電圧4.2V、100℃
CC(0.1C)−CV(0.01C)充電
CC(0.1C)−CV(0.01C)放電
<充放電試験結果>
充電容量102mAh/g、放電容量83mAh/g
Claims (4)
- 正極、無機固体電解質、負極、及び架橋フィルムを備える、無機固体電解質二次電池であって、
前記架橋フィルムは、リチウム塩化合物、及び側鎖にエチレンオキシド単位を有するイオン伝導性ポリマーを含む組成物の架橋体であり、
前記正極と前記無機固体電解質との間、及び前記負極と前記無機固体電解質との間の少なくとも一方に、前記架橋フィルムを有する、無機固体電解質二次電池。 - 前記リチウム塩化合物は、LiBF4、LiPF6、LiClO4、LiCF3SO3、LiN(CF3SO2)2(LiTFSI)、LiN(SFO2)2(LiFSI)、LiN(C2F5SO2)2、及びLiN[CF3SC(C2F5SO2)3]2からなる群より選択される少なくとも1種である、請求項1に記載の無機固体電解質二次電池。
- 前記無機固体電解質と、前記架橋フィルムとが接触している、請求項1または2に記載の無機固体電解質二次電池。
- 前記無機固体電解質は、酸化物系固体電解質又は硫化物系固体電解質である、請求項1〜3のいずれか1項に記載の無機固体電解質二次電池。
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Citations (3)
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WO1997042251A1 (en) * | 1996-05-08 | 1997-11-13 | Daiso Co., Ltd. | Cross-linked solid polyelectrolyte and use thereof |
JP2012014892A (ja) * | 2010-06-30 | 2012-01-19 | Sumitomo Electric Ind Ltd | 非水電解質電池 |
JP2012209230A (ja) * | 2011-03-30 | 2012-10-25 | Daiso Co Ltd | 非水電解質二次電池 |
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WO1997042251A1 (en) * | 1996-05-08 | 1997-11-13 | Daiso Co., Ltd. | Cross-linked solid polyelectrolyte and use thereof |
JP2012014892A (ja) * | 2010-06-30 | 2012-01-19 | Sumitomo Electric Ind Ltd | 非水電解質電池 |
JP2012209230A (ja) * | 2011-03-30 | 2012-10-25 | Daiso Co Ltd | 非水電解質二次電池 |
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KR20230163349A (ko) | 2021-03-30 | 2023-11-30 | 가부시키가이샤 오사카소다 | 음극 보호막 |
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