高い電気化学的安定性を有するイオン導電性フッ素エーテル新種
Chibueze V Amanchukwu, Zhiao Yu, Xian Kong
1Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States.
Journal of the American Chemical Society
|April 3, 2020
まとめ
研究者らは,高度な電池のための高いイオン伝導性と優れた電気化学的安定性を提供する新しいフッ化エーテル電解質を開発しました. 電気自動車やポータブルエレクトロニクスなどで エネルギー密度が高くなります
科学分野:
- 電気化学
- 材料科学
- エネルギー貯蔵
背景:
- 次世代の電池はより高いエネルギー密度を必要とし,しばしば電気化学的安定性または低いイオン伝導性を持つ電解質によって制限されます.
- エーテルベースの電解質は高伝導性であるが,4V以上では不安定であり,水素フッ素エーテル (HFEs) は安定しているが,リチウム塩は溶解しない.
研究 の 目的:
- 高酸化安定性とイオン伝導性を組み合わせた新種のフッ化エーテル電解質を合成する.
- リチウムイオン電池におけるこれらの新種の電解質の性質と性能を調査する.
主な方法:
- 新しいフッ素エーテル化合物の合成
- 導電性と酸化安定性の測定を含む電気化学的特徴づけ
- 核磁共鳴 (NMR) と分子動力学 (MD) を用いてイオン輸送と溶解を研究する.
- バッテリーサイクルのテストは,Ni豊富な層状のカトド (NMC 811) で行う.
主要な成果:
- 30 °Cで最大2.7 × 10−4 S/cmのイオン伝導性を達成した.
- 5. 6Vまでの高酸化安定性を示した.
- 従来のエーテルと比較して,より高いリチウム移転数を観測した.
- NMC 811 カドードでC/5の速度で100回以上成功しました.
結論:
- 新しいフッ素エーテル電解質は,高いイオン伝導性と電気化学的安定性をうまく組み合わせています.
- これらの電解質は 次世代の高エネルギー密度バッテリーを 設計するための有望な進歩です
- 合理的な分子設計アプローチは 将来の電解質開発の経路を提供します
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