Kイオン電池のための炭素電極
Zelang Jian1, Wei Luo1, Xiulei Ji1
1Department of Chemistry, Oregon State University , Corvallis, Oregon 97331-4003, United States.
Journal of the American Chemical Society
|September 3, 2015
まとめ
研究者らは,石墨に電気化学的にカリウムを挿入し,高い容量を達成しました. 再充電可能なカリウムイオン電池の優れた性能を提供する新しいソフトカーボンアノードです.
科学分野:
- 電気化学
- 材料科学
- エネルギー貯蔵
背景:
- カリウムイオン電池 (KIB) は,大規模なエネルギー貯蔵に有望です.
- 効率的なアノド材料の開発は,KIBの性能にとって極めて重要です.
- グラファイトは一般的なアノド材料ですが,カリウムとの性能については調査が必要です.
研究 の 目的:
- 石墨アノドへの電気化学的カリウム挿入を調査する.
- KIB の非水性電解質におけるグラファイトアノードの性能を評価する.
- KIBの性能を向上させるための新しいソフトカーボンアノドを合成し,テストする.
主な方法:
- グラファイトと軟炭アノードの電気化学的特徴.
- 非水性電解質でのカリウム挿入/抽出実験
- サイクル中の構造変化を分析するために,ex situ X線 difraktion (XRD) を使用する.
主要な成果:
- グラファイトアノードは,高可逆容量273mAh/gのカリウム挿入を示しています.
- Ex situ XRDは,カリウム化中に連続した相形成 (KC36,KC24,KC8) を確認した.
- グラフィットアノードは適度な速度と容量低下を示した.
- 合成された非グラフィット軟炭は,グラフィットと比較して優れたサイクル能力と速度性を示した.
結論:
- 石墨に電気化学的にカリウムを挿入することは可能ですが,性能の制限があります.
- ノングラフィト軟炭は充電式KIBの有望な代替アノド材料です.
- この研究は,先進的なKイオン電池技術の開発に新しい道を開きます.
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