リチウム・イオン電池のためのリチウム・マンガンの豊富な層状酸化物の温度感受性構造の進化
Haijun Yu1, Yeong-Gi So2, Yang Ren3
1College of Materials Science & Engineering, Key Laboratory of Advanced Functional Materials, Ministry of Education , Beijing University of Technology , Pingleyuan #100 , Chaoyang District, Beijing , 100124 , People's Republic of China.
Journal of the American Chemical Society
|October 24, 2018
まとめ
バッテリーサイクル中のリチウムに富んだ層状酸化カトドの構造の変化は温度に依存する. この進化を理解することは 電気自動車のための より安定した高エネルギーリチウムイオン電池の設計に 鍵となるものです
科学分野:
- 材料科学
- 電気化学
- エネルギー貯蔵
背景:
- リチウムが豊富な層状酸化物は,特に電気自動車の高エネルギーリチウムイオン電池のための有望なカトド材料です.
- 彼らの複雑な反応機構と電気化学サイクル中の構造的安定性は,実用的な適用のためにさらなる調査を必要とします.
研究 の 目的:
- 電気化学サイクル中の様々な温度でのリチウム・マンガンの豊富な層状酸化物の構造的進化を徹底的に調査する.
- これらのカトド材料の構造的安定性を理解し,設計する.
主な方法:
- 異なる温度でリチウム・マンガンの豊富な層の酸化物の電気化学サイクル.
- コア・シェル構造の形成,酸素の抽出,金属の移動,表面の集積を含む構造の変化の分析.
主要な成果:
- コア・シェル構造 (歪んだモノクリニックのLiTMO2コア,乱れたスピネル/岩塩シェル) に変換される.
- 特定された格子酸素抽出,濃縮,移行金属移動,および表面集積.
- 高い温度で加速する構造的変換の有意な温度感性を示した.
結論:
- サイクル中のリチウム豊富な層状酸化物の構造的進化メカニズムを明らかにした.
- 構造変換は温度に依存しており,材料設計によって制御できます.
- 先進的なバッテリーのサイクル安定性を強化した高エネルギーカトド材料の設計に関する洞察を提供します.
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