摘要
以钨酸钠和乙酸锌为原料,去离子水为溶剂,通过水热法合成前驱物,采用固相烧结制备Zn WO4,探讨不同的p H值和煅烧温度对Zn WO4结构和电化学性能的影响,并通过X射线衍射(XRD)、扫描电子显微镜(SEM)、恒电流充放电和循环伏安测试对其进行表征。结果表明:不同p H下制备的Zn WO4均为表面粗糙的球形颗粒;当p H为7.5、煅烧温度为900℃时,制备得到的黑钨矿型Zn WO4具有良好的电化学性能;在50 m A/g电流密度下,样品的首次充电比容量为710.9 m Ah/g,首次放电比容量为419.9 m Ah/g。
ZnWO4 was prepared by a hydrothermal method followed by solid state calcination using sodium tungstate and zinc acetate as raw materials as well as deionized water as the solvent. The effects of different pH value and calcination temperature on the structure and electrochemical performance of ZnWO4 were investigated by XRD, SEM, constant current charge-discharge and cyclic voltammetry. The results show that the prepared ZnWO4under different pH value are spherical particles with rough surface; when the pH is 7.5 and the calcination temperature is 900 ~, the obtained pure phase wolframite type ZnWO4 has better electrochemical performance. The initial charge and discharge specific capacity of the sample are as high as 710.9 and 419.9 mAh/g at the current density of 50 mA/g.
出处
《电源技术》
CAS
CSCD
北大核心
2015年第8期1626-1628,1747,共4页
Chinese Journal of Power Sources
基金
河南省科技计划项目(122300410297)
关键词
锂离子电池
ZnWO4
水热法
PH值
煅烧温度
Li-ion batteries
ZnW04
hydrothermal method
pH value
calcining temperature
