阳极
储能
化学
钠
碳纤维
电化学
电池(电)
相(物质)
离子
化学工程
金属
纳米技术
功率(物理)
材料科学
电极
复合材料
有机化学
工程类
物理
物理化学
量子力学
复合数
作者
Biao Kong,Lianhai Zu,Chengxin Peng,Yan Zhang,Wei Zhang,Jing Tang,Cordelia Selomulya,Liudi Zhang,Hanxing Chen,Wang Yang,Yang Liu,Haili He,Jing Wei,Xiaocheng Lin,Wei Luo,Jianping Yang,Zaiwang Zhao,Yong Liu,Jinhu Yang,Dongyuan Zhao
摘要
High-power sodium-ion batteries (SIBs) with long-term cycling attract increasing attention for large-scale energy storage. However, traditional SIBs toward practical applications still suffer from low rate capability and poor cycle induced by pulverization and amorphorization of anodes at high rate (over 5 C) during the fast ion insertion/extraction process. The present work demonstrates a robust strategy for a variety of (Sb-C, Bi-C, Sn-C, Ge-C, Sb-Bi-C) freestanding metal-carbon framework thin films via a space-confined superassembly (SCSA) strategy. The sodium-ion battery employing the Sb-C framework exhibits an unprecedented performance with a high specific capacity of 246 mAh g-1, long life cycle (5000 cycles), and superb capacity retention (almost 100%) at a high rate of 7.5 C (3.51A g-1). Further investigation indicates that the unique framework structure enables unusual reversible crystalline-phase transformation, guaranteeing the fast and long-cyclability sodium storage. This study may open an avenue to developing long-cycle-life and high-power SIBs for practical energy applications.
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