JP2023006997A - 全固体電池 - Google Patents
全固体電池 Download PDFInfo
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- JP2023006997A JP2023006997A JP2021109933A JP2021109933A JP2023006997A JP 2023006997 A JP2023006997 A JP 2023006997A JP 2021109933 A JP2021109933 A JP 2021109933A JP 2021109933 A JP2021109933 A JP 2021109933A JP 2023006997 A JP2023006997 A JP 2023006997A
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- Prior art keywords
- electrode layer
- solid
- layer
- solid electrolyte
- negative electrode
- Prior art date
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- Granted
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- 239000007787 solid Substances 0.000 title claims abstract description 15
- 239000007784 solid electrolyte Substances 0.000 claims abstract description 169
- 239000005518 polymer electrolyte Substances 0.000 claims abstract description 84
- 229920000642 polymer Polymers 0.000 claims abstract description 36
- 229910003480 inorganic solid Inorganic materials 0.000 claims abstract description 33
- 229920006037 cross link polymer Polymers 0.000 claims abstract description 11
- 239000002203 sulfidic glass Substances 0.000 claims description 20
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- 239000010410 layer Substances 0.000 description 283
- 239000007773 negative electrode material Substances 0.000 description 16
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- 239000007774 positive electrode material Substances 0.000 description 9
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- XUPYJHCZDLZNFP-UHFFFAOYSA-N butyl butanoate Chemical compound CCCCOC(=O)CCC XUPYJHCZDLZNFP-UHFFFAOYSA-N 0.000 description 8
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- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 2
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- 229910003002 lithium salt Inorganic materials 0.000 description 2
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- 239000007858 starting material Substances 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 229910052718 tin Inorganic materials 0.000 description 2
- CYSGHNMQYZDMIA-UHFFFAOYSA-N 1,3-Dimethyl-2-imidazolidinon Chemical compound CN1CCN(C)C1=O CYSGHNMQYZDMIA-UHFFFAOYSA-N 0.000 description 1
- JWUJQDFVADABEY-UHFFFAOYSA-N 2-methyltetrahydrofuran Chemical compound CC1CCCO1 JWUJQDFVADABEY-UHFFFAOYSA-N 0.000 description 1
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
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- 239000002227 LISICON Substances 0.000 description 1
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- 229910052493 LiFePO4 Inorganic materials 0.000 description 1
- 229910015643 LiMn 2 O 4 Inorganic materials 0.000 description 1
- 229910013641 LiNbO 3 Inorganic materials 0.000 description 1
- 229910013870 LiPF 6 Inorganic materials 0.000 description 1
- 229910001228 Li[Ni1/3Co1/3Mn1/3]O2 (NCM 111) Inorganic materials 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 229910008291 Li—B—O Inorganic materials 0.000 description 1
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- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- 229910010252 TiO3 Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 150000001242 acetic acid derivatives Chemical class 0.000 description 1
- KXKVLQRXCPHEJC-UHFFFAOYSA-N acetic acid trimethyl ester Natural products COC(C)=O KXKVLQRXCPHEJC-UHFFFAOYSA-N 0.000 description 1
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- 238000004458 analytical method Methods 0.000 description 1
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
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- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 description 1
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- ACFSQHQYDZIPRL-UHFFFAOYSA-N lithium;bis(1,1,2,2,2-pentafluoroethylsulfonyl)azanide Chemical compound [Li+].FC(F)(F)C(F)(F)S(=O)(=O)[N-]S(=O)(=O)C(F)(F)C(F)(F)F ACFSQHQYDZIPRL-UHFFFAOYSA-N 0.000 description 1
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- 239000000126 substance Substances 0.000 description 1
- HXJUTPCZVOIRIF-UHFFFAOYSA-N sulfolane Chemical compound O=S1(=O)CCCC1 HXJUTPCZVOIRIF-UHFFFAOYSA-N 0.000 description 1
- GJBRNHKUVLOCEB-UHFFFAOYSA-N tert-butyl benzenecarboperoxoate Chemical compound CC(C)(C)OOC(=O)C1=CC=CC=C1 GJBRNHKUVLOCEB-UHFFFAOYSA-N 0.000 description 1
- BWSZXUOMATYHHI-UHFFFAOYSA-N tert-butyl octaneperoxoate Chemical compound CCCCCCCC(=O)OOC(C)(C)C BWSZXUOMATYHHI-UHFFFAOYSA-N 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
Images
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/572—Means for preventing undesired use or discharge
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M10/0561—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of inorganic materials only
- H01M10/0562—Solid materials
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
- H01M10/0565—Polymeric materials, e.g. gel-type or solid-type
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
-
- 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
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4235—Safety or regulating additives or arrangements in electrodes, separators or electrolyte
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
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- H01M2300/0065—Solid electrolytes
- H01M2300/0068—Solid electrolytes inorganic
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2300/00—Electrolytes
- H01M2300/0017—Non-aqueous electrolytes
- H01M2300/0065—Solid electrolytes
- H01M2300/0082—Organic polymers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Inorganic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Dispersion Chemistry (AREA)
- Materials Engineering (AREA)
- Secondary Cells (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
【解決手段】本開示においては、正極層と、固体電解質層と、負極層とを、厚さ方向に沿って、この順に有する全固体電池であって、上記正極層および上記負極層の一方が、第1ポリマー電解質を含有する電極層Aであり、上記正極層および上記負極層の他方が、無機固体電解質を含有する電極層Bであり、上記固体電解質層が、第2ポリマー電解質を含有し、上記第2ポリマー電解質は、ポリマー成分が架橋された架橋ポリマー電解質であり、上記全固体電池を上記厚さ方向に沿って平面視した場合に、上記固体電解質層の面積が、上記電極層Aの面積より大きい、全固体電池を提供することにより、上記課題を解決する。
【選択図】図1
Description
正極層および負極層の一方は、第1ポリマー電解質を含有する電極層Aである。第1ポリマー電解質は、ポリマー成分を少なくとも含有する。ポリマー成分としては、例えば、ポリエーテル系ポリマー、ポリエステル系ポリマー、ポリアミン系ポリマー、ポリスルフィド系ポリマーが挙げられ、中でもポリエーテル系ポリマーが好ましい。イオン伝導度が高く、ヤング率および破断強度等の機械特性に優れているからである。
正極層および負極層の他方は、無機固体電解質を含有する電極層Bである。無機固体電解質としては、例えば、硫化物固体電解質、酸化物固体電解質、ハロゲン化物固体電解質が挙げられる。また、無機固体電解質は、ガラス(非晶質体)であってもよく、ガラスセラミックスであってもよく、結晶であってもよい。ガラスは、例えば、原料を非晶質化することで得られる。ガラスセラミックスは、例えば、ガラスに熱処理を行うことで得られる。結晶は、例えば、原料を加熱することで得られる。
本開示における固体電解質層は、正極層および負極層の間に配置され、固体電解質として、第2ポリマー電解質を含有する。
本開示における全固体電池は、通常、正極層から電子を集電する正極集電体と、負極層から電子を集電する負極集電体と、を有する。正極集電体の材料としては、例えば、SUS、アルミニウム、ニッケル、カーボンが挙げられる。正極集電体の形状としては、例えば、箔状が挙げられる。一方、負極集電体の材料としては、例えば、SUS、銅、ニッケル、カーボンが挙げられる。負極集電体の形状としては、例えば、箔状が挙げられる。
本開示における全固体電池は、正極層、固体電解質層および負極層を有する発電単位を備える。全固体電池は、発電単位を1つのみ有していてもよく、2以上有していてもよい。全固体電池が複数の発電単位を有する場合、それらは、並列接続されていてもよく、直列接続されていてもよい。また、全固体電池は、正極層、固体電解質層および負極層を収納する外装体を備える。外装体として、例えば、ラミネート型外装体、缶型外装体が挙げられる。
(ポリマー電解質溶液の作製)
ポリエチレンオキサイド(PEO;Mwは約4,000,000である)と、リチウムビストリフルオロメタンスルホニルイミド(Li-TFSI)とを、EO単位:Li=20:1のモル比となるように秤量した。これらを、アセトニトリルに溶解させ、ポリマー電解質溶液を得た。
出発原料として、Li2S、P2S5およびLiIを準備した。次に、Li2SおよびP2S5を、75Li2S・25P2S5のモル比(Li3PS4、オルト組成)となるように秤量した。次に、LiIの割合が15mol%となるようにLiIを秤量した。秤量した出発原料をメノウ乳鉢で5分間混合し、その混合物を遊星型ボールミルの容器に投入し、脱水ヘプタンを投入し、さらにZrO2ボール(φ=5mm)を投入し、容器を完全に密閉した。この容器を遊星型ボールミル機(フリッチュ製P7)に取り付け、台盤回転数500rpmで、40時間メカニカルミリングを行った。その後、100℃で乾燥することによりヘプタンを除去し、硫化物ガラスを得た。得られた硫化物ガラスをガラス管の中に入れ、190℃で10時間熱処理を行い、ガラスセラミックスである硫化物固体電解質を得た。
以下の材料を用意し混合した。
・ニッケルコバルトアルミニウム酸リチウム(正極活物質)
・作製した硫化物固体電解質(固体電解質)
・気相成長炭素繊維(導電材)
・ポリフッ化ビニリデン系バインダーを5重量%の割合で含有する酪酸ブチル溶液(バインダー溶液)
・酪酸ブチル(分散媒)
なお、正極活物質および硫化物固体電解質の体積比率は、75:25とした。
以下の材料を用意し混合した。
・シリコン粒子(負極活物質)
・気相成長炭素繊維(導電材)
・ポリフッ化ビニリデン系バインダーを5重量%の割合で含有する酪酸ブチル溶液(バインダー溶液)
・酪酸ブチル(分散媒)
以下の材料を用意し混合した。
・作製した硫化物固体電解質(固体電解質)
・ポリフッ化ビニリデン系バインダーを5重量%の割合で含有するヘプタン溶液(バインダー溶液)
・ヘプタン(分散媒)
まず、正極構造体における正極層と、固体電解質層とを対向させて配置した。この積層体に対して、165℃、100kNの条件でロールプレス処理を行った。これにより、固体電解質層を正極層に転写し、かつ、正極層を緻密化した。その後、固体電解質層からAl箔を剥離し、固体電解質層を有する正極構造体を得た。
まず、比較例1と同様にして、固体電解質層と、固体電解質層を有する正極構造体と、固体電解質層を有する負極構造体とを準備した。
まず、比較例1と同様にして、ポリマー電解質溶液、固体電解質層、正極構造体および負極構造体を準備した。
正極構造体における正極層と、固体電解質層とを対向させて配置した。その後、比較例1と同様にして、固体電解質層を有する正極構造体を得た。
比較例1、参考例1および実施例1で作製した全固体電池の開回路電圧(OCV)を測定し、短絡の有無を確認した。その結果を表1に示す。
2 …正極集電体
3 …固体電解質層
4 …負極層
5 …負極集電体
10 …全固体電池
Claims (7)
- 正極層と、固体電解質層と、負極層とを、厚さ方向に沿って、この順に有する全固体電池であって、
前記正極層および前記負極層の一方が、第1ポリマー電解質を含有する電極層Aであり、
前記正極層および前記負極層の他方が、無機固体電解質を含有する電極層Bであり、
前記固体電解質層が、第2ポリマー電解質を含有し、
前記第2ポリマー電解質は、ポリマー成分が架橋された架橋ポリマー電解質であり、
前記全固体電池を前記厚さ方向に沿って平面視した場合に、前記固体電解質層の面積が、前記電極層Aの面積より大きい、全固体電池。 - 前記全固体電池を前記厚さ方向に沿って平面視した場合に、前記固体電解質層の面積が、前記電極層Bの面積より大きい、請求項1に記載の全固体電池。
- 前記電極層Aが、前記負極層である、請求項1または請求項2に記載の全固体電池。
- 前記第1ポリマー電解質および前記第2ポリマー電解質が、ドライポリマー電解質である、請求項1から請求項3までのいずれかの請求項に記載の全固体電池。
- 前記第1ポリマー電解質および前記第2ポリマー電解質が、ポリマー成分として、ポリエーテル系ポリマーを含有する、請求項1から請求項4までのいずれかの請求項に記載の全固体電池。
- 前記ポリエーテル系ポリマーが、繰り返し単位内に、ポリエチレンオキサイド構造を有する、請求項5に記載の全固体電池。
- 前記無機固体電解質が、硫化物固体電解質である、請求項1から請求項6までのいずれかの請求項に記載の全固体電池。
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