シングル・クリスタリン・ニール・リッチ・カソッドの優れたサイクル性を高めるための安定した地下/表面構造の構築
Youqi Chu1,2, Kai Wang3, Changdong Chen1
1Guangzhou Key Laboratory for Surface Chemistry of Energy Materials, New Energy Research Institute, School of Environment and Energy, South China University of Technology, Guangzhou, 510006, P. R. China.
Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|August 30, 2025
まとめ
この研究は,二重改変を使用して単結晶のニッケル豊富なカソッドを強化します. 改良されたカトッドは,高エネルギーリチウムイオン電池の優れた構造と電気化学的安定性を示しています.
科学分野:
- 材料科学
- 電気化学
- バッテリー技術
背景:
- 単結晶のNi豊富なカトッドは,高電圧サイクル中の移行金属溶解および相不安定などの課題に直面しています.
- これらの問題は,高エネルギーリチウムイオン電池の実用的な適用を制限しています.
研究 の 目的:
- シングル結晶のLiNi0.90Co0.05Mn0.05O2 (SCNCM90) の二重改変戦略を開発する.
- 構造的な強度と電気化学的耐久性を長時間高圧操作で向上させる.
主な方法:
- 地下アル=ビグラデント コドーピングの実施
- 表面にAl5BO9のコーティングを塗る
- 高電圧で電気化学サイクルテストを行う.
主要な成果:
- Al/BグラデントドーピングはH2-H3相移行を抑制し,格子ストレスを減少させた.
- アル5BO9コーティングは,電極と電解質の界面反応を緩和した.
- 改造されたSCNCM90カトッドは4. 5Vの200サイクル後に95. 83%の容量保持を達成し,1Cの1000サイクル後に89. 6%の容量保持を達成した.
結論:
- 二重改変戦略は,単結晶のNi豊富なカトドの構造的および電気化学的安定性を効果的に改善します.
- このアプローチは 次世代の高エネルギーリチウムイオン電池の 実現に寄与します
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