磷酸铁锂在水溶液中的循环伏安研究  

Study on cyclic voltammetry of LiFePO_4 in aqueous electrolyte

作　　者：黄可龙[1] 杨赛[1] 刘素琴[1] 王海波[1] 

机构地区：[1]中南大学化学化工学院,湖南长沙410083

出　　处：《电源技术》2007年第5期386-388,共3页Chinese Journal of Power Sources

基　　金：国家教育部博士基金资助项目(20030533001)

摘　　要：采用循环伏安法对LiFePO4在水溶液中的电化学行为进行了研究,用X射线衍射分析表征了循环扫描过程中材料结构的变化。结果表明,LiFePO4在饱和LiNO3溶液中具有良好的电化学可逆性。循环伏安法估算出Li+在LiFePO4中的扩散系数约为(1.8￣4.4)×10-11cm2·s-1,根据循环伏安曲线计算得,其初始放电比容量为75.3mAh·g-1。以0.5mV/s的扫描速度循环50次后,容量保持初始容量的47.6%。The electrochemical behavior of LiFePO4 in aqueous electrolyte was investigated by cyclic voltammetry, and its structure changes were studied by X-ray diffraction （XRD）. The results show that LiFePO4 has good electrochemical reversibility in saturated LiNO3 solution. The lithium diffusion coefficient calculated from cyclic voltammetry is in the rang of （1.8-4.4） × 10^-11 cm^2·s^-1. The initial discharge capacity is calculated to be 75.3 mAh· g^-1, 47.6% of the discharge capacity remained after 50 cyclic voltammetry at the scan rate of 0.5 mV/s.

关 键 词：水溶液锂离子电池 磷酸铁锂 循环伏安 

分 类 号：TM912.9[电气工程—电力电子与电力传动]