インターカレーション化学を制御して,高性能の二塩混合充電電池を設計する
Jae-Hyun Cho1, Muratahan Aykol, Soo Kim
1Center for Energy Convergence Research, Korea Institute of Science and Technology , Hwarang-ro 14-gil 5, Seongbuk-gu, Seoul 136-791, Republic of Korea.
Journal of the American Chemical Society
|November 4, 2014
まとめ
研究者は,ハイブリッドマグネシウムイオン/リチウムイオン (Mg2+/Li+) バッテリーを調査し,Mo6S8カソッドの重要なリチウムイオン活性値を発見しました. この発見により,充電電池の超高速放電が可能になった.
科学分野:
- マテリアルサイエンス 材料科学
- 電気化学 電気化学について
- コンピューティング・ケミストリー
背景:
- ハイブリッドマグネシウムイオン/リチウムイオン (Mg2+/Li+) バッテリーは,先進的なエネルギー貯蔵の可能性を秘めています.
- カトド材料にイオンが共挿入される基本的なメカニズムを理解することは,バッテリーの性能を最適化するために不可欠です.
研究 の 目的:
- ハイブリッドのMg2+/Li+充電電池の電気化学的性質の原子学的およびマクロスコプ的起源を解明する.
- Mo6S8カトドにMg2+とLi+の共挿入を制御する熱力学的要因を決定する.
- 制御された挿入化学によるバッテリー放電率を向上させるため.
主な方法:
- 密度関数理論 (DFT) の計算で,イオン共挿入熱力学を調査する.
- 二重塩の電解質を用いた実験的電気化学の研究.
- 様々な充電/放電率 (20Cおよび30C) での性能評価.
主要な成果:
- Mo6S8正極がLi+またはMg2+の挿入を好むかどうかを決定する値Li+活性が特定されました.
- 超高速のバッテリー放電は,共挿入化学を正確に制御することによって達成されました.
- 高容量保持 (20°Cで93.6%,30°Cで87.5%) が室温で実証されました.
結論:
- この研究は,ハイブリッドバッテリーにおけるイオン共挿入の制御におけるLi+活動の重要な役割を明らかにしています.
- 二重塩の電解質を使用した挿入化学の正確な制御は,バッテリーの性能を大幅に向上させます.
- これらの発見は,高電力,高性能の充電電池の開発に道を開く.
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