Zero-Strain Na2FeSiO4 as Novel Cathode Material for Sodium-Ion Batteries

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• 作者：Shouding Li ; Jianghuai Guo ; Zhuo Ye ; Xin Zhao ; Shunqing Wu ; Jin-Xiao Mi ; Cai-Zhuang Wang ; Zhengliang Gong ; Matthew J McDonald ; Zizhong Zhu ; Kai-Ming Ho ; Yong Yang
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：July 13, 2016
• 年：2016
• 卷：8
• 期：27
• 页码：17233-17238
• 全文大小：450K
• 年卷期：0
• ISSN：1944-8252

文摘

A new cubic polymorph of sodium iron silicate, Na₂FeSiO₄, is reported for the first time as a cathode material for Na-ion batteries. It adopts an unprecedented cubic rigid tetrahedral open framework structure, i.e., F4̅3m, leading to a polyanion cathode material without apparent cell volume change during the charge/discharge processes. This cathode shows a reversible capacity of 106 mAh g^–1 and a capacity retention of 96% at 5 mA g^–1 after 20 cycles.