电化学溶液pH值对聚吡咯铝电容器性能的影响*

摘要

Polypyrrole aluminum electrolytic capacitors were prepared by using two-step method of chemical and electrochemical polymerization. Effects of electrochemical polymerzation pH on capacitance and equivalent series resistance of the polypyrrole aluminum electrolytic capacitors were investigated,and the microstructure of polypyrrole polymerized at different electrochemical polymerization pH were observed by SEM. The results show that with the increase of electrochemical polymerization pH,the sizes of polypyrrole particles increase and their distribution becomes loose,the capacitance of the capacitor decreases and equivalent series resistance increases. The polypyrrole polymerized at pH=2 has high compactness and its particles are small and even,and the corresponding capacitor possesses the best performance with the highest capacitance of 18.3 μF and the lowest equivalent series resistance of 20.4 mΩ.%采用化学聚合和电化学聚合两步法制备聚吡咯铝电解电容器，研究了电化学溶液pH值对聚吡咯的微观形貌及聚吡咯铝电解电容器的电容量和等效串联电阻的影响。结果表明，随着电化学溶液pH值增加，聚吡咯的颗粒增大，分布越来越松散，电容器的电容量减小、等效串联电阻增大。在电化学聚合溶液pH=2条件下，制备的聚吡咯致密性高，颗粒小且均匀，且相应的电容器具有最高的电容量和最低的等效串联电阻，其值分别为18.3μF和20.4 mΩ。