還元競争効果による固体電解質インターフェーズと均等に分散した無機物質により,超高速で長寿命のナトリウム金属電池が可能
Shuang Wan1, Keming Song2, Jiacheng Chen2
1State Key Laboratory of Chemical Resource Engineering, Beijing Key Laboratory of Electrochemical Process and Technology of Materials, Beijing University of Chemical Technology, Beijing 100029, P. R. China.
Journal of the American Chemical Society
|September 19, 2023
まとめ
研究者は,LiTFSIを使用して,ナトリウム金属電池 (SMB) のための新しい固体電解質インターフェーズ (SEI) を開発しました. この戦略はイオン輸送を強化し,安定した,高速のナトリウム堆積を可能にし,バッテリーの性能と寿命を改善します.
科学分野:
- 材料科学
- 電気化学
- エネルギー貯蔵
背景:
- 堅固な固体電解質インターフェーズ (SEI) 構造は,ナトリウム金属電池 (SMB) の性能にとって不可欠です.
- 一般的な無機SEIは導電性が低く,分布が悪いため,Na+の拡散と均一な堆積を妨げます.
研究 の 目的:
- SMBの改善のために,均等に分散した,高伝導性の無機物質で新しいSEIを設計する.
- SEI形成の犠牲者としてのLiTFSIの役割を調査する.
主な方法:
- LITFSIをナトリウム塩ベースの炭酸電解質に導入し,自己犠牲のSEIを作成します.
- LiTFSIとFECの間の減少競争を利用して,SEIの構成と形態を制御する.
- 改造されたSEIを搭載したまたは無したNa33Na3V2 ((PO4) 3) 細胞の電気化学試験
主要な成果:
- LiTFSIから派生したSEIは,Li3Nのような高伝導性の無機物質を均等に散布し,急速なイオン輸送経路を提供します.
- 改良されたSEIは迅速なナトリウム沈殿を促進し,超高速度の能力を可能にします.
- 新しいSEIを搭載したNa3V2 ((PO4) 3) 細胞は,10,000サイクル後に60°Cで89.15%の容量保持を達成し,対照細胞を上回った.
結論:
- LiTFSIを使用した新しいSEI設計は,極端な高利率条件下で運営できるSMBの開発のための新しい戦略を提供します.
- このアプローチは,電化学的安定性とナトリウム金属電池の速度性能を大幅に高めます.
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