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高圧リチウム金属電池の安定サイクルを可能にするステリック効果の調節イオン溶解
Yuelang Chen1,2, Zhiao Yu1,2, Paul Rudnicki1
1Department of Chemical Engineering, Stanford University, Stanford, California 94305, United States.
Journal of the American Chemical Society
|October 28, 2021
まとめ
リチウム金属電池の性能を向上させた研究者は,新しい電解質溶媒である1,2-ディエトキシエタン (DEE) を設計した. この分子設計はインターフェイスの安定性を高め,高圧アプリケーションのバッテリー寿命を延長します.
科学分野:
- 材料科学
- 電気化学
- 化学工学
背景:
- 1,2-ジメトキシエタン (DME) はリチウム金属電池の一般的な電解剤ですが,クーロンビック効率と高圧安定性において課題に直面しています.
- 既存のDMEベースの電解質は,高電圧の完全な電池での長期的な循環能力に制限があります.
研究 の 目的:
- Li+イオン溶解構造を調節するためにステリック障害を用いた分子設計原理を導入する.
- 1,2-ダイオキシエタン (DEE) がDMEよりも優れた電解質溶媒としての可能性を調査する.
- 高圧リチウム金属電池のリチウムアノドとカトドの両方のインターフェイスの安定性を高めるために.
主な方法:
- DMEのメトキシ群をより大きなエトキシ群に置き換えてDEEを作成する分子設計.
- 溶解構造に影響を及ぼし,アニオンに富んだ内部の溶解殻を作り出す.
- LiFSI/DEE電解質の電気化学的安定性の実験と計算分析
主要な成果:
- DEEを使用したステリック効果ベースの設計は,DMEと比較して電気化学的安定性を改善しました.
- 厳格なフルセル試験 (4.8 mAh cm-2 NMC811,4.4 Vカットオフ) で,LiFSI/DEE電解質は182サイクルで容量の80%を保持しました.
- 同じ条件下でLIFSI/DME電解質は94サイクルしか達成できず,DEEの優れた性能を強調した.
結論:
- DEEのようなエーテルベースの電解質溶媒の 分子設計は 高い電圧のリチウム金属電池の 実現に有望な戦略です
- ステリック障害は,溶解構造を調節し,インターフェイスの安定性を高めるための効果的な原理です.
- 開発されたLiFSI/DEE電解質は,リチウム金属電池技術の進歩に大きな可能性を秘めている.
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