Direct Superassemblies of Freestanding Metal–Carbon Frameworks Featuring Reversible Crystalline-Phase Transformation for Electrochemical Sodium Storage

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• 作者：Biao Kong ; Lianhai ZuChengxin Peng ; Yan Zhang ; Wei Zhang ; Jing Tang ; Cordelia Selomulya ; Liudi Zhang ; Hanxing Chen ; Yang Wang ; Yang Liu ; Haili He ; Jing Wei ; Xiaocheng LinWei Luo ; Jianping Yang ; Zaiwang Zhao ; Yong LiuJinhu Yang ; Dongyuan Zhao
• 刊名：Journal of the American Chemical Society
• 出版年：2016
• 出版时间：December 21, 2016
• 年：2016
• 卷：138
• 期：50
• 页码：16533-16541
• 全文大小：692K
• ISSN：1520-5126

文摘

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.