pH对水溶液锂离子电池负极材料LiV_3O_8性能的影响  

Effect of pH on Cycle Pformance of LiV_3O_8//LiMn_2O_4 Aqueous Lithium-ion Battery

作　　者：刘长委 吴斌[1] 田卿卿[1] 朱靖[1] 

机构地区：[1]河北联合大学化工学院,河北唐山063009

出　　处：《广州化工》2014年第15期58-60,共3页GuangZhou Chemical Industry

基　　金：河北省自然科学基金项目(E2014209303);河北联合大学大学生创新性实验计划项目(X2012017)

摘　　要：采用柠檬酸溶胶-凝胶法合成了层状锂离子嵌入化合物LiV3O8,用XRD、SEM对其晶体结构和表面形貌进行表征,用循环伏安法对其嵌锂性能和扩散系数进行测定,用恒电流充放电法研究了电解液pH对电极可逆性及对模拟电池容量和循环性能的影响。结果显示,电解液pH=7时,电池的性能最优,首次放电比容量为81.0 mAh·g-1,40次后比容量保持率达89.1%。Layered lithium ion intercalation compound LiV 3 O8 was synthesized by citric acid sol -gel method.The crystal structure and surface morphology were characterized by XRD and SEM.The lithium intercalation properties and the diffusion coefficients of as prepared materials were tested by cyclic voltammetry.The effect of pH on the reversibility of electrode , battery capacity and cycle performance were studied by galvanostatic charge -discharge.The battery showed the best electrochemical performance with electrolyte pH =7.The first specific discharge capacity was 81 mAh＆#183; g-1 with a retention of 89.1%after 40 cycles.

关 键 词：水溶液锂离子电池 PH值 LIV3O8 负极材料 循环性能 LiV3 O8 

分 类 号：TM912.9[电气工程—电力电子与电力传动]