An SbOx/Reduced Graphene Oxide Composite as a High-Rate Anode Material for Sodium-Ion Batteries

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• 作者：Xiaosi Zhou ; Xia Liu ; Yan Xu ; Yunxia Liu ; Zhihui Dai ; Jianchun Bao
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：October 16, 2014
• 年：2014
• 卷：118
• 期：41
• 页码：23527-23534
• 全文大小：414K
• ISSN：1932-7455

文摘

Antimony has attracted enormous attention as anode materials for sodium-ion batteries owing to its high theoretical gravimetric capacity (鈭?60 mA h g^鈥?). Despite the outstanding gravimetric capacity advantage, antimony suffers from unsatisfactory electrochemical performance originating from its huge volume changes during repeated sodium insertion/extraction. Herein, we synthesize an SbO_x/reduced graphene oxide (SbO_x/RGO) composite through a wet-milling approach accompanied by redox reaction between Sb and GO. When used as an anode material for sodium-ion batteries, SbO_x/RGO exhibits high rate capability and stable cycling performance. A reversible capacity of 352 mA h g^鈥? was obtained even at a current density of 5 A g^鈥?. More than 95% capacity retention (409 mA h g^鈥?) was achieved after 100 cycles at a current density of 1 A g^鈥?. The excellent electrochemical performance is due to the Sb鈥揙 bonding between nanometer-sized SbO_x particles surface and highly conductive RGO, which can not only effectively prevent SbO_x nanoparticles from aggregation upon cycling but also promote the electrons and sodium ions transportation.