ナトリウムイオン電池の層状過渡性金属酸化物カトドのホメオスタティック固溶液
Meng Ren1, Shuo Zhao1, Suning Gao1
1Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Renewable Energy Conversion and Storage Center (RECAST), College of Chemistry, Nankai University, Tianjin 300071, China.
Journal of the American Chemical Society
|December 23, 2022
まとめ
新しいカトド材料は,ナトリウムイオン電池 (SIB) で安定した固体溶液反応を可能にし,二相変換に共通する構造問題を克服します. この設計は,高度なSIBのサイクル安定性と速度性能を向上させます.
科学分野:
- 固体電気化学
- 材料科学
- エネルギー貯蔵
背景:
- 固体電気化学における二相反応は,しばしば構造的劣化を引き起こす.
- ナトリウムイオン電池 (SIB) の大きなイオン挿入/抽出は,張力,裂け目,容量低下につながる.
- 層状のカトド材料はSIBにとって不可欠ですが,構造的な安定性には課題があります.
研究 の 目的:
- SIB のための層状のカトド材料で恒常的な固体溶液反応を調査する.
- ナトリウムイオンサイクル中の構造安定性の改善の背後にあるメカニズムを理解する.
- 高性能SIBのための高度なカトド材料を設計する.
主な方法:
- 層状カトド材料P'2-Na0.653Ni0.081Mn0.799Ti0.120O2の合成と特徴づけについて
- サイクル安定性と速度性能を評価するための電気化学試験.
- 先進技術 (暗示) を用いたナトリウム化および脱ナトリウム化中の構造変化の分析.
主要な成果:
- P'2-Na0.653Ni0.081Mn0.799Ti0.120でホメオスタティックな固体溶液反応が達成されました.
- 合同的なNiとTiの組み込みにより,O2p) -Mn3d-eg*) のハイブリッド化が強化され,ヤーン-テラー歪曲が緩和された.
- この材料は,優れたサイクル安定性 (87.2%のリテンション500サイクル後に) とレート能力 (2500mAg-1で100.5mAhg-1) を示した.
結論:
- 固体溶液反応経路は,2相反応と比較して優れた構造的完全性を提供します.
- このアプローチは,SIBのための安定した高性能カトド材料の設計のための新しい戦略を提供します.
- この発見により 次世代のナトリウムイオンエネルギー貯蔵装置の 開発が進められます
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