JP2022518316A - 全固体電池用電極及びそれを含む電極組立体の製造方法 - Google Patents
全固体電池用電極及びそれを含む電極組立体の製造方法 Download PDFInfo
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Images
Classifications
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- H—ELECTRICITY
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- 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
- H01M4/139—Processes of manufacture
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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
- H01M10/00—Secondary cells; Manufacture thereof
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Abstract
Description
(1)電極と固体電解質膜との界面抵抗が減少する。
(2)電極内の電極活物質と固体電解質との界面抵抗が減少する。
(3)電極内の気孔度が低下する。
(4)本発明の製造方法によって製造された電極及び電極組立体を電池に適用する場合、電池の容量、律速及びサイクル性能などの電気化学的特性が改善される。
(1)電極組立体の製造
正極集電体としてアルミニウム薄膜(厚さ17μm)を用意し、負極集電体として銅薄膜(厚さ17μm)を用意した。
実施例1及び比較例1で製造された電池に対し、25℃でリチウム金属対比3V~4.25Vの電圧範囲で0.05C定電流で1回充放電し電池容量を確認し(実測容量)、それを設計容量と比較した。また、実施例2及び比較例2で製造された電池に対し、25℃でリチウム金属対比0.005V~1.5Vの電圧範囲で0.05C定電流で1回充放電して電池容量を確認し、それを設計容量と比較した。
実施例1及び比較例1の電池に対し、25℃でリチウム金属対比3V~4.25Vの電圧範囲で0.05C定電流で1回充放電して電池容量を確認した(1stサイクル)。その後、3V~4.25Vの電圧範囲で0.1C定電流で1回充放電し、電池容量を確認した(2ndサイクル)。一方、実施例2及び比較例2の電池に対し、25℃でリチウム金属対比0.005V~1.5Vの電圧範囲で0.05C定電流で1回充放電して電池容量を確認した(1stサイクル)。その後、0.005V~1.5Vの電圧範囲で0.1C定電流で1回充放電し、電池容量を確認した(2ndサイクル)。それぞれの実施例及び比較例で1stサイクル/2ndサイクルの電池容量の比率を確認して上記の表3に示した。
表3から、実施例1及び実施例2の電池は比較例の電池に比べて実測容量が設計容量に近いことが分かる。また、実施例1及び実施例2の電池は、高率放電特性が比較例の電池に比べて優れることが確認できる。
Claims (10)
- 全固体電池用電極の製造方法であって、
(S1)電極活物質及び固体電解質を含む予備電極活物質層形成用スラリーを用意する段階であって、前記スラリーのうち溶媒を除いた固形分の濃度が30wt%~60wt%である、第1段階と、
(S2)前記予備電極活物質層形成用スラリーを集電体の表面にコーティングし乾燥して予備電極活物質層を形成する第2段階と、
(S3)固体電解質材料を含む固体電解質層用スラリーを用意する段階であって、前記スラリーのうち溶媒を除いた固形分の濃度が30wt%~50wt%である、第3段階と、
(S4)前記固体電解質層用スラリーを前記予備電極活物質層の表面に塗布し乾燥する第4段階と、を含む、全固体電池用電極の製造方法。 - 前記第2段階で得られる予備電極活物質層の気孔度が50vol%~70vol%である、請求項1に記載の全固体電池用電極の製造方法。
- 前記第4段階で得られる電極は電極活物質層及びその表面に形成された固体電解質層を含み、前記電極活物質層は気孔度が20vol%~30vol%である、請求項1または2に記載の全固体電池用電極の製造方法。
- 前記固体電解質材料が硫化物系固体電解質材料を含む、請求項1から3のいずれか一項に記載の全固体電池用電極の製造方法。
- 前記硫化物系固体電解質が硫黄(S)を含み、Li-P-S(LPS)系ガラス及びLi-P-S(LPS)系ガラスセラミックのうちの少なくとも一つを含む、請求項4に記載の全固体電池用電極の製造方法。
- 前記溶媒が非極性溶媒を含む、請求項1から5のいずれか一項に記載の全固体電池用電極の製造方法。
- 前記非極性溶媒が、1,2-ジクロロベンゼン、ペンタン、ベンゼン、キシレン、トルエン、クロロホルム、ヘキサン、シクロヘキサン、四塩化炭素、エーテル、ジエチルアミン、ジオキサン、クロロベンゼン、アニソール、テトラヒドロフラン、メチルtert-ブチルエーテル、ヘプタンまたはこれらのうち二つ以上の混合物を含む、請求項6に記載の全固体電池用電極の製造方法。
- 前記予備電極活物質層形成用スラリー及び/または固体電解質層用スラリーはバインダー樹脂をさらに含み、
前記バインダー樹脂は、アクリレート、アクリロニトリル-スチレン-ブタジエン共重合体、スチレン-ブタジエン共重合体、イソブチレン-イソプレン共重合体のようなブチルゴム、アクリロニトリル-ブタジエンゴム(NBR)、エチレンプロピレンジエン三元共重合体(EPDM)またはこれらのうち2種以上を含む、請求項1から7のいずれか一項に記載の全固体電池用電極の製造方法。 - 正極及び負極を積層して加圧する方法で得られる全固体電池の製造方法であって、前記負極及び正極のうちの少なくとも一つが請求項1から8のいずれか一項に記載のものであり、固体電解質層が正極と負極との間に介在されるように積層される、全固体電池の製造方法。
- 正極、負極及び前記正極と負極との間に介在された固体電解質膜を含み、前記負極及び正極のうちの少なくとも一つの電極が請求項1から8のいずれか一項に記載の方法によって製造された、全固体電池。
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US11811043B2 (en) | 2023-11-07 |
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JP7125548B2 (ja) | 2022-08-24 |
CN112602208A (zh) | 2021-04-02 |
WO2020231234A1 (ko) | 2020-11-19 |
CN112602208B (zh) | 2024-03-01 |
US20210328206A1 (en) | 2021-10-21 |
KR102621741B1 (ko) | 2024-01-04 |
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