电聚合条件对聚吡咯钽电解电容器容量与损耗的影响

研究了导电聚吡咯在多孔Ta/Ta2O5阳极体（1μF/16V）表面的制备方法，采用恒电流电聚合法在该阳极体表面沉积一层导电聚吡咯作为电解电容器的阴极，着重探讨了支撑电解液的组成，阳极电流的大小及其施加方式对所形成的电容器容量和损耗因子的影响，结果表明：吡咯单体和支撑电解质的浓度比保持在3至4之间对电容器的性能是有益的，而过高浓度的吡咯单体和支撑电解质则会产生不利影响；随着阳极电流的增大，电容器的性能变差，因此阳避孕药电流不宜超过1.2mA.在以乙腈和1，2-丙二醇碳酸酯的混合物为溶剂的支撑电解液中，采用先施加大的阳极电流而后施加小电流的方法，可以获得平均容量达到额定容量98%以上且损耗因子较小（tgδ）小于1.3%)的样品。

Influence of Electropolymerization Conditions on the Capacitance and Dissipation Factor of Polypyrrole Tantalum Electrolytic Capacitors

The approaches,by which conducting polypyrrole could be electrodeposited on the surface of tantalun/tantalum pentoxide-based anode(1 microfarad, 16V), have　been studied. The galvanostatically polymerized polypyrrole is used for the cathodes of tantalum electrolytic capacitors. Particularly, the influence of electropolymerization conditions, such assupporting electrolyte solution composition, anodic current value and applied mode, on the capacitance and dissipation factor of as-made capacitor has been discussed. With over concentration of pyrrole and electrolyte, there was a disadvantageous effect on the properties of as-made samples. However, it is benefit to keep the ratio of concentration of pyrrole and electrolyte between 3～4. The properties would be deteriorated with the increase of anodic currect, so the anodic current should be below 1．2 mA. Samples with capacitance almost 98 percent of the rated capacitance and low dissipation factor less than 0．013 were accomplished in supporting electrolyte using mixture of acetonitrile and 1,2-propanediol carbonate as solvent. During the electropoly merization process, a larger anodic current first, a smaller one later, must be applied.