锂电池聚吡咯复合正极材料的研究

采用化学氧化法制备了聚吡咯/V2O5干凝胶(PPy/VXG)导电复合材料。用制备的复合材料作正极,组装了扣式锂二次电池。运用SEMI、CI、CP、XRD及循环伏安法对电极材料和电池性能进行表征和测试。结果表明:PPy/VXG复合正极材料是通过阴离子的掺杂/脱掺杂及锂离子的嵌脱反应来实现充放电的;循环伏安曲线的氧化-还原峰较对称和稳定,且具有较大的峰电流,表明PPy/VXG具有较好的电化学可逆性和较高的电极活性;PPy/VXG的放电比容量随充放电电流的增大而降低,当充放电电流从0.1 mA提高到0.4 mA时,材料的平均放电比容量下降约7.5%。

Study of polypyrrole composite cathode material for lithium cell

Polypyrrole/vanadium pentoxide xerogel(PPy/VXG) conductive composite material was synthesized by the chemical oxidative method.The button lithium secondary cell was fabricated with composite material as cathode.Performance of the(cathode) material and cells were investigated and characterized by SEM,IC,ICP,XRD and cyclic voltammetry.The results showed that the charge-discharge of PPy/VXG composite cathode material was realized by doping-undoping of anions and lithium ions.The oxidation and reduction peaks of cyclic voltammetry were symmetrical and steady,the peak currents had large values,which showed that the electrochemical reversibility and activity of PPy/VXG were good.The discharge specific capacity of PPy/VXG decreased with the increasing of charge-discharge current.When the charge-discharge current increased from 0.1 mA to(0.4 mA,) the average discharge specific capacity of the material decreased about 7.5%.