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石榴石固体電解質の超リチオフォビシティから超リチオフィリティへの移行
Wei Luo1, Yunhui Gong1, Yizhou Zhu1
1Department of Materials Science and Engineering, ‡Department of Mechanical Engineering, and §University of Maryland Energy Research Center, University of Maryland , College Park, Maryland 20742, United States.
Journal of the American Chemical Society
|August 30, 2016
まとめ
研究者たちは 石榴石の電解質をシリコンで覆い 固体リチウム電池の安全性を向上させました このコーティングはリチウム金属との接触を強化し,インターフェイス抵抗を軽減し,より安全で高性能なエネルギー貯蔵のためのバッテリーの安定性を改善します.
科学分野:
- 材料科学
- 電気化学
- エネルギー貯蔵
背景:
- 全固体リチウム電池 (ASSLB) は,従来のリチウムイオン電池と比較して安全性と安定性を向上させます.
- 固体電解質 (SSEs) はデンドライト形成を防止し,リチウム金属アノドの使用を許可するが,リチウムとのインターフェイス接触が悪い.
- Li金属/SSEインターフェースの高いインターフェイス抵抗と偏振は,ASSLBの性能を阻害する.
研究 の 目的:
- リチウム金属と石榴石ベースの固体電解質の間の接面特性を改善する.
- 無形シリコンコーティングがガーネットのSSEの湿透性と電気化学性能に与える影響を調査する.
- ASSLBにおけるリチウム金属アノドの安定性を高める方法を示す.
主な方法:
- プラズマ強化化学蒸気堆積 (PECVD) を使用した石榴石SSEの無形シリコン (a-Si) コーティング.
- 裸でSiコーティングされたガーネットのSSEを持つリチウム金属対称細胞の電気化学的特徴.
- インターフェイス抵抗とサイクル安定性の分析
主要な成果:
- a-Siコーティングは,リチウム化されたシリコンの in situ 形成により,ガーネット表面を"超リチオホービック"から"超リチオフィリック"に変えました.
- 金属と石榴石のSSEの表面抵抗は925から127Ωcmまで劇的に減少した.
- SiコーティングされたガーネットのSSEは,リチウム塗装/剥離サイクル中に著しく安定性を示した.
結論:
- スイッチ可能なリチオフォビック-リチオフィリック表面改変は,リチオ金属/SSEインターフェースを強化するための実行可能な戦略です.
- 石榴石のSSEのシリコンコーティングは,インターフェイスの極化を効果的に抑制し,サイクリングの安定性を改善します.
- このアプローチは 次世代の高性能で安全な完全固体リチウム電池の開発に 有望です
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