Synthesis and electrochemical properties of Zn<sub>2sub>SnO<sub>4sub> and Zn<sub>2sub>Sn<sub>0.8sub>Ti<sub>0.2sub>O<sub>4sub>/C
- 作者：Wan-song YUAN ; Yan-wen TIAN<sup> ; sup><sup>yuanwansong2010@163.comsup> ; Li-juan LIU ; Jian-zhong LI
- 关键词：Zn2SnO4 ; Zn2Sn0.8Ti0.2O4/C ; titanium substitution ; lithium ion batteries ; anode materials
- 刊名：Transactions of Nonferrous Metals Society of China
- 出版年：2012
- 期刊代码：12_10036326
- 类别：ms
- 出版时间：April, 2012
- 卷：22
- 期：4
- 页码：858-864
- 文件大小：1014 K
摘要
Compound Zn<sub>2sub>Sn<sub>0.8sub>Ti<sub>0.2sub>O<sub>4sub> was synthesized by a hydrothermal method in which SnCl<sub>4sub>路5H<sub>2sub>O, TiCl<sub>4sub>, ZnCl<sub>2sub> and N<sub>2sub>H<sub>4sub>路H<sub>2sub>O were used as reactants. The composite Zn<sub>2sub>Sn<sub>0.8sub>Ti<sub>0.2sub>O<sub>4sub>/C was then prepared through a carbothermic reduction process using the as-prepared Zn<sub>2sub>Sn<sub>0.8sub>Ti<sub>0.2sub>O<sub>4sub> and glucose as reactants. The structure, morphology and electrochemical properties of the as-prepared products were investigated by XRD, XPS, TEM and electrochemical measurements. In addition, electrochemical Li insertion/extraction in composite Zn<sub>2sub>Sn<sub>0.8sub>Ti<sub>0.2sub>O<sub>4sub>/C were examined by ex situ XRD and SEM. The first discharge capacity of Zn<sub>2sub>SnO<sub>4sub> is about 1670.8 mA路h/g, with a capacity retain of 342.7 mA路h/g in the 40th cycle at a constant current density of 100 mA/g in the voltage range of 0.05-3.0 V. Comparing with the Zn<sub>2sub>SnO<sub>4sub>, some improved electrochemical properties are obtained for Zn<sub>2sub>Sn<sub>0.8sub>Ti<sub>0.2sub>O<sub>4sub>, Zn<sub>2sub>SnO<sub>4sub>/C and Zn<sub>2sub>Sn<sub>0.8sub>Ti<sub>0.2sub>O<sub>4sub>/C. The composite Zn<sub>2sub>Sn<sub>0.8sub>Ti<sub>0.2sub>O<sub>4sub>/C shows the best electrochemical properties, and its first discharge capacity is about 1530.0 mA路h/g, with a capacity retain of 479.1 mA路h/g the 100th cycle.