組成的に複雑なドーピングは,ゼロストレスのゼロコバルト層のカトド
Rui Zhang1, Chunyang Wang1, Peichao Zou1
1Department of Physics and Astronomy, University of California, Irvine, CA, USA.
Nature
|September 21, 2022
まとめ
リチウムイオン電池からコバルトを取り除くことは 極めて重要です この研究により,高ニッケル,ゼロコバルトの新型カトドが導入され,より安全で長寿命のバッテリーソリューションが提供されます.
科学分野:
- 材料科学
- 電気化学
- バッテリー技術
背景:
- コバルトの価格の変動と地政学的な問題は 自動車産業のバッテリーから コバルトを取り除くことを必要としています
- 高ニッケル,コバルトフリー (ゼロ-Co) のカトドは,高いエネルギー密度と低コストのため,次世代のリチウムイオン電池にとって有望である.
- 既存の高ニッケルカトドは,熱的/化学的-機械的不安定性と限られたサイクル寿命で問題に直面しています.
研究 の 目的:
- 安定した高性能の高ニッケル,ゼロコバルトのカトド材料を開発する.
- 現在のゼロコバルトカソッド技術に関連する安全性と安定性の懸念に対処する.
- 先進的なリチウムイオン電池に 商業的に有効なカソッドを提供するためです
主な方法:
- 複合的な (高エントロピー) ドーピング戦略を利用した.
- 材料の特徴化のためにX線微分法,伝送電子顕微鏡法,ナノトモグラフィーを用いた.
- 熱安定性を評価するために,in-situ加熱実験を行った.
主要な成果:
- 高ニッケル,ゼロコバルト層のカソッドを成功裏に製造し,熱とサイクルの安定性を強化しました.
- 電気化学サイクルでほぼゼロの体積変化が観察され,欠陥や亀裂を最小限に抑える.
- NMC-532と同等の熱安定性と優れた容量保持性を示した.
結論:
- 開発された高エントロピードーピングの ゼロコバルトカトドは 安全で長寿命の リチウムイオン電池の 実現可能な解決策です
- この研究は,インターケレーション電極におけるストレンスと相変換を緩和するための普遍的な戦略を提示しています.
- 高ニッケル・ゼロコバルトの カソード材料の安全性や安定性に関する 問題が解決されました
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