焙烧气氛对合成ZnWO_4电化学性能的影响  

Effect of calcining atmosphere on electrochemical performance of ZnWO_4

作　　者：王志涛[1,2] 张林森[2] 谢文菊[1] 

机构地区：[1]武夷学院生态与资源工程学院,福建武夷山354300 [2]郑州轻工业学院材料与化学工程学院河南省表界面科学重点实验室,河南郑州450002

出　　处：《电源技术》2015年第1期49-51,共3页Chinese Journal of Power Sources

基　　金：河南省科技计划项目(122300410297)

摘　　要：用溶胶-凝胶法合成了锂离子电池负极材料ZnWO4,研究了不同焙烧气氛对样品性能的影响。利用X射线衍射光谱法(XRD)、扫描电子显微镜法(SEM)和恒流充放电及交流阻抗研究了合成样品的晶体结构、形貌及电化学性能。结果表明:在空气和氩气气氛中焙烧均可得到黑钨矿相的ZnWO4,但空气气氛中粉体为片状,颗粒较小,而在氩气中焙烧得到的样品,颗粒表面光滑,有网状结构。氩气氛围的样品,以50 m A/g进行恒流充放电时,首次可逆比容量为446.29m Ah/g,明显高于空气氛围中所得样品的首周可逆比容量(298.60 m Ah/g),且循环性能较好。ZnWO4,used for Lithium-ion anode materials, was synthesized by citrates sol-gel method. The effect of calcining atmosphere on synthesis process of samples was studied. The crystal structure and morphology of samples were characterized by X-ray difraction （XRD） and scanning electron microscopy （SEM）, and the electrochemical performance was determined by ganostatic charge-discharge test and electrochemical impedance spectroscopy. The experimental results show that ZnWO4 is prepared by calcining in oxygen and argon. The powder obtained in air atmosphere had flake shape and the particle was smaller. However, the powder obtained in Ar atmosphere had sphere shape and the particle was bigger. The first discharge capacity of ZnWO4 obtained in Ar atmosphere was 446.29 mAh/g singnifciantly higher than that obtained in air （298.60 mAh/g）, and a good reversibility was showed.

关 键 词：ZnWO4 溶胶-凝胶法 焙烧 气氛 电化学性能 

分 类 号：TM912.9[电气工程—电力电子与电力传动]