The Equivalent Series Resistance (ESR) of electrolytic capacitors has been reduced to single digit values by the introduction of conductive polymers over the last years. While the lowering of ESR is still the driving force for the development, capacitor manufacturers devote an increasing effort to reliability improvements. The quality of the outer conductive polymer layer on polymer capacitors is a key factor for leakage and ESR stability. We have developed a conductive polymer dispersion which allows for the formation of a dense coating with outstanding properties on tantalum and aluminum anodes: The new conductive polymer coating prevents the penetration of graphite and silver particles to the dielectric and thus ensures low leakage currents. Good adhesion of the coating to the anode results in low ESR. Finally an excellent self-healing ability and general physical properties make the processing easy and fast compared to standard chemical processes. Most recent developments and applications based on our conducting polymer dispersion technology will be presented in our presentation given at the conference.
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