長サイクル固体リチウム金属電池のための自由残留溶剤のイオン二極相互作用誘発エンカプセル化

Menglu Li^1,2,3, Hanwen An^1,2,3, Yajie Song^1,2

¹MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China.

Journal of the American Chemical Society

|November 9, 2023

まとめ

固体リチウム電池のポリウニリデンフッ化物 (PVDF) 電解質の残留溶媒を捕獲する新しい戦略です. これはサイクルの安定性を高め,80%の容量保持で2000以上のサイクルを達成します.

科学分野:

材料科学
電気化学
ポリマー科学

背景:

ポリウニリデンフッ化物 (PVDF) 電解質は,固体リチウム電池に高いイオン伝導性と機械的強度を提供します.
PVDF電解質の反応性残留溶剤は,バッテリーのサイクル安定性と寿命を大幅に制限します.

研究の目的:

PVDFの電解質の残留溶媒を捕獲する戦略を策定する.
固体リチウム電池のサイクル安定性と性能を改善する.

主な方法:

リチウム二酸化硫酸塩 (LiDFOB) 塩添加物を利用してイオン二極相互作用を強化した.
Li+イオンと残留溶剤分子の相互作用を調査した.
電子と電解質のインターフェイスでアニオン由来インターフェーズの形成を分析した.

主要な成果:

LiDFOB添加物は,Li+の電陽性を再分配することによって,残留溶媒を効果的に捕獲した.
改変された調整環境は,動力的に安定したアニオン由来インターフェーズの形成を促進した.
固体電池は2000サイクル以上で,平均99.9%のクーロンビック効率と80%の容量保持を示した.

結論:

フリー溶剤捕獲戦略は,インターフェースの副作用を成功裏に軽減します.
固体電池のサイクル寿命を延ばすには,残留溶剤の有意な規制が不可欠です.
このアプローチは,高性能の固体リチウム電池の開発に有望な経路を提供します.

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