リチウム過剰のカトド材料における可逆性Mn2+/Mn4+二酸化還元
Jinhyuk Lee1,2, Daniil A Kitchaev3, Deok-Hwang Kwon4
1Department of Materials Science and Engineering, University of California, Berkeley, CA, USA. jinhyuk@mit.edu.
Nature
|April 13, 2018
まとめ
研究者はリチウムイオン電池用の マンガンに富んだ新しいカトド材料を開発しました これらの低コストで高エネルギー密度な材料は コバルトやニッケルに代えて 持続可能で バッテリーの性能と安全性を向上させます
科学分野:
- 材料科学
- 電気化学
- エネルギー貯蔵
背景:
- 電気エネルギー貯蔵の需要が増えるため,先進的なリチウムイオン電池 (LIB) カソード材料が必要になります.
- 現在のLIBは,コストが高く,希少で,安全性の問題であるニッケルとコバルトに依存しています.
- マンガン基のカトッドは,低コスト,豊富,安定したMn4+状態のために魅力的です.
研究 の 目的:
- 低コストで高エネルギー密度のカトド材料を開発する.
- コバルトとニッケルに代わる持続可能な材料としてマンガン基の材料を探求する.
- LIBの性能と安全性を,新しいカトド設計によって向上させる.
主な方法:
- 高価なカチオンと部分的なフッ素と酸素の交換を組み合わせた新しい戦略です.
- リチウム過剰カトド材料に可逆性Mn2+/Mn4+二酸化還元カップルの組み込み
- マンガンに富んだ高度なカトド材料の合成と特徴付け
主要な成果:
- 高い容量とエネルギー密度を持つリチウムに富んだカトド材料を成功裏に製造した.
- Mn2+/Mn4+レドックスカップルの材料の安定性を高める効果を示した.
- マンガンのリドックスによる酸素リドックス活性が低下し,材料の安定化が改善された.
結論:
- 開発されたマンガンに富んだカトッドは,高性能のLIBのための有望な経路を提供します.
- この戦略は,先進的で,費用対効果の高い,より安全なバッテリー材料の設計のための新しい機会を提供します.
- この研究は持続可能なエネルギー貯蔵ソリューションの開発に寄与します.
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