安全なリチウム金属電池を促進する高インターフェーシャルエネルギーインターフェーゼ
Sufu Liu1,2, Xiao Ji1, Jie Yue1
1Department of Chemical and Biomolecular Engineering , University of Maryland , College Park , Maryland 20740 , United States.
Journal of the American Chemical Society
|January 14, 2020
まとめ
新しいリチウム-ストロンチウム合金アノードは,安定した,ストロンチウムフッ化物豊富な固体電解質インターフェーズ (SEI) を形成し,バッテリーのリチウムデンドライトを効果的に抑制します. このアプローチは,バッテリーの安全性と性能を高めるための新しい戦略を提供します.
科学分野:
- 材料科学
- 電気化学
- バッテリー技術
背景:
- 安定した固体電解質インターフェーズ (SEI) 形成は,バッテリーのリチウムデンドライトを抑制するために不可欠です.
- 複雑な電気化学反応のために,電解質製剤を通じて望ましいSEIを達成することは困難です.
研究 の 目的:
- リチウム金属アノドの組成を変更することで,安定したSEIの設計のための新しい戦略を開発する.
- リチウム-ストロンチウム (Li-Sr) 合金アノドを使用して,ストロンチウムフッ化物 (SrF2) 豊富なSEIを形成することを調査する.
主な方法:
- 酸化電解質に固有のSrF2豊富なSRIを形成するために,Li-11重%のSr合金アノドを設計した.
- SEI特性を分析するために,密度関数理論 (DFT) の計算と実験的特徴付けを使用した.
- 製造および試験されたLi-Sr/CuおよびLi-Sr/Li-Sr対称性セル,およびLi-Sr/キャソードセル (LFPおよびNCM811).
主要な成果:
- SrF2に富んだSEIは,リチウム金属と優れた機械的強度で高レベルのインターフェイスエネルギーを示し,デンドライトの成長を効果的に抑制します.
- Li-Sr/Cu細胞は高クーロンビック効率 (例えば,1 mA cm-2で99.42%) とLi-Sr/Li-Sr細胞の安定サイクル (30 mA cm-2で180サイクル) を示した.
- LFPとNCM811カトドとのペアリングされたLi-Srアノードは,さまざまな電解質で優れた容量保持を示した.
結論:
- リチウム金属陽極の組成を調節することによってSEIの性質を設計することは,実行可能で合理的なアプローチです.
- Li-Sr合金アノド戦略は,より安全で高性能なリチウム金属電池の開発に有望な経路を提供します.
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