溶胶凝胶法对Na_3V_2(PO_4)_3晶体生长和电化学性能的影响  

Effect of sol-gel method on crystal growth and electrochemical properties of Na_3V_2(PO_4)_3

作　　者：王强 程波明 钟怀玉 王清辉 钟盛文 WANG Qiang;CHENG Bo-ming;ZHONG Huai-yu;WANG Qing-hui;ZHONG Sheng-wen(Jiangxi Key Laboratory of Power Battery and Materials,School of Material Science and Engineering,Jiangxi University of Science and Technology,Ganzhou Jiangxi 341000,China)

机构地区：[1]江西理工大学材料科学与工程学院江西省动力电池及其材料重点实验室,江西赣州341000

出　　处：《电源技术》2019年第4期559-561,625,共4页Chinese Journal of Power Sources

基　　金：国家自然科学基金(51372104)

摘　　要：以柠檬酸为络合剂,采用溶胶凝胶法制备钠离子电池正极材料Na_3V_2(PO_4)_3。借助XRD、SEM等测试手段对样品的结构和形貌进行了深入分析,借助电化学测试手段对材料电化学性能进行了测试。结果表明:材料在750℃下保温8 h时,材料晶格发育良好。结晶度高的正极材料,在2.5～4.0 V电压下以0.2 C电流充放电,首次放电比容量达到107mAh/g,首次不可逆容量占比为1.29%,经过150次循环后,比容量保持在97.1 mAh/g,容量衰减为90.75%。The compound Na3V2(PO4)3 was successfully prepared by by sol-gel method with citric acid as complexing agent. The samples of structure and morphology were characterized by XRD, SEM and electrochemical properties were tested by electrochemical testing. The results show that it have good crystallinity of the cathode material that the sample synthesizing at 750 ℃ for 8 h. The discharge specific capacity is 107 mAh/g in 2.5 V to 4.0 V voltage range in 0.2 C current, and the first irreversible capacity is 1.29%. It can deliver reversible specific capacity of 97.1 mAh/g after 150 cycles at the current rate of 0.2 C, and a capacity fading of 9.25%.

关 键 词：溶胶凝胶法 Na3V2(PO4)3 结构 电化学性能 

分 类 号：TM912[电气工程—电力电子与电力传动]