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

TitleDirect Superassemblies of Freestanding Metal-Carbon Frameworks Featuring Reversible Crystalline-Phase Transformation for Electrochemical Sodium Storage
Publication TypeJournal Article
Year of Publication2016
AuthorsKong, Biao, Zu Lianhai, Peng Chengxin, Zhang Yan, Zhang Wei, Tang Jing, Selomulya Cordelia, Zhang Liudi, Chen Hanxing, Wang Yang, Liu Yang, He Haili, Wei Jing, Ling Xiaocheng, Luo Wei, Yang Jianping, Zhao Zaiwang, Liu Yong, Yang Jinhu, and Zhao Dongyuan
JournalJ. Am. Chem. Soc.
Volume138
Pagination16533–16541
Date Published12/2016
ISSN0002-7863
Keywordscomposite, high-capacity, high-performance anode, lithium-ion, na-ion batteries, nucleation, porous carbon, promising anode material, reduced graphene oxide, ultralong cycle life
Abstract

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.

DOI10.1021/jacs.6b10782

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