電気化学的ナトリウム貯蔵のための可逆結晶相変換を特徴とする独立金属炭素フレームワークの直接スーパーアセンブリ
Biao Kong1, Lianhai Zu2,3, Chengxin Peng3,4
1Department of Chemistry, Laboratory of Advanced Materials, Fudan University , Shanghai 200433, P. R. China.
Journal of the American Chemical Society
|December 13, 2016
まとめ
この研究は,ナトリウムイオン電池 (SIB) のための新しい金属炭素の枠組みを導入し,性能を大幅に改善します. これらの高度なSIBは,エネルギー貯蔵のための高電力と長いサイクルライフを提供します.
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に不可欠ですが,低レート能力と低サイクル寿命で課題に直面しています.
- アノド粉砕と高充/放電率 (5°C以上) での無形化は,SIBの実用的な応用を制限する.
研究 の 目的:
- 高性能で長いサイクルの SIB アノドのための頑丈なフリースタンドの金属炭素フレームワークの薄膜を開発する.
- 伝統的なSIBアノドの限界を新しい製造戦略で克服する.
主な方法:
- スペース・コンフィネッド・スーパーアセンブリ (SCSA) 戦略を用いて,様々なフリースタンドの金属・炭素フレームワークの薄膜 (例えば,Sb-C,Bi-C,Sn-C,Ge-C,Sb-Bi-C) を作成した.
- この新しいアノド材料を使ってナトリウムイオン電池のプロトタイプを製造し,テストしました.
主要な成果:
- Sb-Cフレームアノードは,7.5C (3.51A g-1) で246 mAhの特異的容量を示した.
- 高速でほぼ100%の容量保持で5000サイクルの優れたサイクル寿命を達成しました.
- フレームワーク内の可逆結晶相変換は,循環性の強化の鍵として特定されました.
結論:
- SCSA戦略は,優れた速度能力とサイクル安定性を有する高性能SIBアノドを成功裏に生産しました.
- 開発された金属炭素のフレームワーク材料は 次世代の高性能で長寿命のナトリウムイオン電池に 大きな希望を示しています
- この研究は,先進的なSIB技術を用いた実用的なエネルギー貯蔵ソリューションへの道を開きます.
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