摘要
研究了导电聚吡咯在多孔Ta/Ta2 O5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 ,因此阳极电流不宜超过 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 .
The approaches, by which the conducting polypyrrole could be electrodeposited on the surface of tantalun/tantalum pentoxide-based anode (1 microfarad, 16 V), are studied. The galvano-statically polymerized polypyrrole is used for the cathodes of tantalum electrolytic capacitors. Particularly, the influences of electro-polymerization conditions, such as supporting electrolyte solution composition, anodic current and applied mode, on the capacitance and dissipation factor of as-made capacitor are discussed. With over concentration of pyrrole and electrolyte, there is a disadvantageous effect on the properties of the samples. However, it is benefit to keep the ratio of concentration of pyrrole and electrolyte between 3 and 4. The properties would be deteriorated with the increase of anodic current, 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 electro-polymerization process, a larger anodic current first, a smaller one later, must be applied.
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2001年第6期608-611,620,共5页
Journal of Xi'an Jiaotong University
基金
1999年度高等学校优秀青年教师教学与科研奖励基金资助项目
2 0 0 0年度电子物理与器件教育部重点实验室访问学者基金资助项目
关键词
钽电解电容器
导电聚吡咯
电聚合
支撑电解液
阳极电流
Capacitance
Electric losses
Electrochemistry
Electrodeposition
Electrolytes
Polymerization
Tantalum
