化学聚合条件对导电聚合物作阴极钽电解电容器性能的影响

Influence of Chemical Polymerization Conditions on the Properties of PEDT Used for the Cathodes of Tantalum Electrolytic Capacitors

研究了在多孔Ta/Ta_2O_5阳极表面原位聚合PEDT导电聚合物膜的制备方法,重点讨论了化学聚合的组成、聚合温度、驱溶温度等对所制电容器性能的影响。研究结果表明,所用氧化剂与单体EDT的比例保持在3～6范围内有益于提高电容器高频性能即降低ESR值;随着聚合温度的升高,对电容器的损耗有一定的影响;驱溶温度对被覆的薄膜导电性有较大影响,表现为电容器的ESR值变大。

This paper studied approaches to conduct preparation of poly(3, 4-ethylenedioxythiophene)(PEDT)by chemical polymerization on the surface of tantalun/tantalum pentoxide-based anode. The chemical polymerized PEDT is used for the cathodes of tantalum electrolytic capacitors. Particularly, the influence of chemical polymerization conditions, such EDT and oxidizing agent solution composition, polymerized temperature and solvent evaporated temperature, on the capacitance and dissipation factor of as made capacitor, is discussed. It is beneficial to keep the ratio of concentration of EDT and oxidizing agent between 1:3～6. The properties would be deteriorated with the increase of polymerized temperature; meanwhile, the solvent evaporated temperature should come up to 80℃ step by step.