Synthesis and electrochemical properties of Zn₂SnO₄ and Zn₂Sn_0.8Ti_0.2O₄/C

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• 作者：Wan-song YUAN ; Yan-wen TIAN ; ^{yuanwansong2010@163.com} ; 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 Zn₂Sn_0.8Ti_0.2O₄ was synthesized by a hydrothermal method in which SnCl₄路5H₂O, TiCl₄, ZnCl₂ and N₂H₄路H₂O were used as reactants. The composite Zn₂Sn_0.8Ti_0.2O₄/C was then prepared through a carbothermic reduction process using the as-prepared Zn₂Sn_0.8Ti_0.2O₄ 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 Zn₂Sn_0.8Ti_0.2O₄/C were examined by ex situ XRD and SEM. The first discharge capacity of Zn₂SnO₄ 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 Zn₂SnO₄, some improved electrochemical properties are obtained for Zn₂Sn_0.8Ti_0.2O₄, Zn₂SnO₄/C and Zn₂Sn_0.8Ti_0.2O₄/C. The composite Zn₂Sn_0.8Ti_0.2O₄/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.