Electrolyte mixture, composition for conductive polymer synthesis and conductive polymer solid electrolytic capacitor formed by using the same

Abstract

The invention discloses an electrolyte mixture, a composition for conductive polymer synthesis and conductive polymer solid electrolytic capacitor formed by using the same. The electrolyte mixture includes a conductive polymer and a nitrogen-containing polymer. The nitrogen-containing polymer includes a cyclic nitrogen-containing polymer, a polymer with primary amine group, a polymer with secondary amine group, a polymer with tertiary amine group, a polymer with quaternary ammonium group, or a combination thereof. The interface impedance between the conductive polymer and the oxide film can be facilitated by additionally providing the cyclic nitrogen-containing polymer, and the filming performance of the conductive polymer can be improved, the conductivity of the conductive polymer can be improved, and by applying the cyclic nitrogen-containing polymer to the solid electrolytic capacitor, the capacitance, the reliability, the voltage resistance performance, and the thermal resistance performance of the solid electrolytic capacitor can be improved, the dissipation factor value, the 120kHz equivalent series resistor, and the service lifetime can be reduced.

Description

technical field [0001] The invention relates to an electrolyte mixture for an electrolytic capacitor, a composition for synthesizing a polymer and a conductive polymer solid electrolytic capacitor. Background technique [0002] For a long time, improving the conductivity of the electrolyte has been a major issue in the development of electrolytic capacitors. The electrolyte with high conductivity can reduce the equivalent series resistance of the capacitor, achieve high frequency low impedance and have high reliability characteristics. Compared with the liquid electrolyte or solid organic semiconductor complex salt used in traditional electrolytic capacitors, conductive polymers have higher conductivity and moderate high-temperature insulation There is no risk of capacitor explosion caused by liquid volatilization in liquid capacitors. Therefore, conductive polymers have become the development trend of solid electrolytes used in electrolytic capacitors today. [0003] Cond...

AI Technical Summary

Problems solved by technology

However, the reliability of conductive polymer high-voltage capacitors cannot be improved due to some factors

First, due to the poor properties of the conductive polymer film layer and its brittleness, long-term use is likely to deform itself due to vibration from the environment, or cause oxide layer damage (breakdown)

Furthermore, the film-forming properties of conductive polymers are not good enough to completely cover the surface of the dielectric layer of the capacitor, thus reducing the capacitance extraction rate of the solid electrolytic capacitor.

In addition, when the material of the dielectric layer is crystalline oxide or anodized aluminum oxide, the aluminum oxide layer in the dielectric layer is inhomogeneous, and the grain boundaries of the dielectric layer (grain boundaries) are likely to cause cracks, and the resulting leakage current increases

[0006] From the above solid electrolytic capacitors, it can be seen that solid electrolytic capacitors can overcome the lack of liquid aluminum electrolytic capacitors. However, according to actual use and testing, it is found that the above technology still has many shortcomings. Solid electrolytes are used instead of liquid electrolytes to eliminate liquid temperature characteristics. Poor or unstable for a long time, but in the case of high load or high temperature, the solid electrolytic capacitor will produce a large leakage current. According to the experimental data, the highest voltage that the existing solid electrolytic capacitors can withstand is less than 50 volts. How to improve the withstand voltage of solid electrolytic capacitors is a technical problem that needs to be improved urgently.

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