【摘要】 利用电化学沉积的方法在腐蚀并赋能的铝箔试样表面合成了聚吡咯 ,并制备了聚吡咯铝电解电容器 .在聚吡咯被覆的过程中 ,由于聚合溶液的毛细现象使电容器的阴极与阳极之间形成了微小的电气通路 ,另外聚合溶液对铝氧化膜有一定的腐蚀作用 ,导致氧化膜的缺陷增加 ,这两种情况是聚吡咯电解电容器漏电流增加的根本原因 .研究发现 ,采用合适的阻断材料和缩短聚合时间均可以有效地降低它们的影响 .通过热重 -差热分析 ,说明了在贮存过程中环境对这种电容器漏电流的影响 ,并提出了保持该电容器长期性能稳定的措施 .更多还原

【Abstract】 Polypyrrole aluminum electrolytic capacitors were made by electrochemically depositing polypyrrole on the surface of etched and formed aluminum foils. During the polypyrrole electro-polymerization processes, the capillarity of polymerization solutions makes some tiny polypyrrole electrically conducting passages form between the cathode and anode of this capacitor. Further-more, polymerization solutions corrode the dielectric anode oxide of the capaci-tor. The two cases are intrinsic factors for increasing the leakage current of polypyrrole aluminum electrolytic capaci-tors. It was found experimentally that coating silicon rubber and shortening the polymerization time could significantly decrease the leakage current, so as to correspondingly improve the frequency characteristics of capacitance and dissipation factor of the capacitor. The thermogravi-metric and differential thermal analysis of the unsealed samples in the air revealed that the sealing process is very important to retain a long period stability.更多还原