掺杂聚苯胺锂电池正极材料的性能研究

Study of DBSA doped polyaniline used as cathode material for lithium cell

用化学氧化聚合制备了十二烷基苯磺酸(DBSA)掺杂的导电聚苯胺(PANI)材料,采用恒流充放电、循环伏安和交流阻抗等电化学方法对其作为锂离子电池正极材料的电化学性能进行了研究,并利用红外光谱对聚合物循环前后的结构进行表征。结果表明,聚苯胺正极具有较高的放电容量,首次放电容量达63.3mAh/g,20次充放电循环后保持在48.5mAh/g。循环伏安曲线及交流阻抗谱表明聚苯胺具有较好的电化学活性。红外光谱测试表明,聚苯胺正极在20次充放电循环后结构基本保持不变。

Conductive polyaniline （PANI）was prepared by the chemical-oxidative polymerization, and SDBS was used as doping agent. The electrochemical performance were investigated as the cathode material in lithium secondary batteries by galvanostatically discharge, cyclic voltammetry and AC impedance. The structure characteristics of PANI was studied by infrared absorption spectroscopy. The results indicated that PAN showed a high discharge capacity. The discharge specific capacity was 63.3 mAh/g in the first cycle and after 20 cycles it keeped about 48.5 mAh/g. The CV curve and impedance response proved that the electrochemical performance of PANI was good. The FT-IR spectrum showed that the structure of PANI was unchanged after 20 cycles.