リチウムドーピングで安定した高性能P2-Na0.66Li0.18Fe0.12Mn0.7O2ナトリウムイオン電池のためのカソッド
Lufeng Yang1, Xiang Li2, Jue Liu3
1The Woodruff School of Mechanical Engineering , Georgia Institute of Technology , 771 Ferst Drive , Atlanta , Georgia 30332-0245 , United States.
Journal of the American Chemical Society
|April 2, 2019
まとめ
ナトリウムイオン電池のカトドに リチウムドーピングを加えると 安定性が向上します 新しいP2-Na0.66Li0.18Fe0.12Mn0.7O2カトッドは,エネルギー貯蔵アプリケーションのための高い容量と保持性を示しています.
科学分野:
- 材料科学
- 電気化学
- エネルギー貯蔵
背景:
- ナトリウムイオン電池 (SIB) は,大規模なエネルギー貯蔵と電気自動車にとって有望です.
- SIBの開発を阻害する主要な課題は,キャソード容量の低さです.
研究 の 目的:
- SIB用の新しい層の酸化カトドの設計と合成.
- SIB カトドの容量保持と安定性を改善する.
主な方法:
- P2-Na0.66Li0.18Fe0.12Mn0.7O2という新しい層状の酸化カソッドを合成した.
- 容量とサイクルの安定性を含む電気化学性能を調査した.
- 構造変化を分析するために,ex situとin situのX線 difraktionと固体核磁気共振スペクトロスコーピーを利用した.
主要な成果:
- 190mAhの高容量を達成した.
- 1. 5~4. 5Vの電圧範囲内で80サイクル後に ~87%の驚くべき容量保持が実証されました.
- リチウムの可逆的移動と有害なP2-O2相移行の抑制が観察され,安定性に寄与した.
結論:
- 移行金属層のリチウムドーピングは,SIBカトドの脱塩構造を効果的に安定させます.
- 新しいP2-Na0.66Li0.18Fe0.12Mn0.7O2カトードは,安定した高性能ナトリウムイオン電池のための有望なソリューションを提供します.
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