Process Optimization And Performance Of Organic Chip Solid Tantalum Electrolytic Capacitors

In this paper, fabrication process of conducting polymer chip tantalum capacitors was investigated in detail, and optimized preparation process was established based on the large-scale production process. The polymer chip tantalum capacitors with excellent high frequency performance have been prepared with optimized fabrication process, and the main research works are as follows:(1) The polymerization conditions for improved conductivity of polymer film such as the polymerization temperature and concentration ratio of solvent have been studied and optimized.(2) The fabrication factors of molding and forming process to influence the performance of capacitor,especially the molding density, the formation voltage and the formation current have been investigated and optimized in detail.(3) The key parameters of cathode film deposition such as polymer concentration, polymerization temperature, doping concentration and the dipping temperature have been studied. The performance of capacitors has been investigated.(4) The encapsulation process for polymer chip tantalum capacitors has been studied, and the key parameters, especially the injection pressure, has been investigated and optimized, and the related mechanisms has been also discussed.(5) The proper technique suitable for self-healing characteristic of polymer chip tantalum capacitors was investigated, and the relationship between self-healing phenomenon and working course of capacitor has been established.Based on the works above, the polymer chip tantalum capacitors with well capacity performance, low dissipation, low leakage current and excellent high-frequency performance have been prepared. Furthermore, this paper provide an important and valuable contribution to improve the performance of solid tantalum capacitors, and give a possible referenced work for new pattern devices and large-scale polymer chip tantalum capacitors production.