Solid electrolytic capacitor and preparation method thereof

Abstract

The invention relates to the technical field of capacitors, and specifically relates to a solid electrolytic capacitor and a preparation method thereof. The solid electrolytic capacitor is characterized in that the surface of an electrode foil and the surface of a piece of diaphragm electrolytic paper are each filled with a conductive polymer filling layer, so that the electrode foil and the diaphragm electrolytic paper have high energizing properties; and the voltage of the solid aluminum electrolytic capacitor is effectively improved, and can reach 450 V and above. The preparation method ofthe solid electrolytic capacitor eliminates the impregnation process in the prior art, eliminates the impregnation unevenness or non-intensive impregnation caused by the impregnation process by filling or covering the surface of the electrode foil and the surface of the diaphragm electrolytic paper in all directions, and can prepare a solid electrolytic capacitors with the voltage of 450V and above. As the capacitor core package does not need an impregnation process in the preparation method, and does not need a chemical conversion pretreatment process of the core package, the preparation method of the solid electrolytic capacitor has greater advantages in production efficiency and environmental protection and energy saving aspects.

Description

technical field [0001] The invention relates to the technical field of capacitors, in particular to a solid electrolytic capacitor and a preparation method thereof. Background technique [0002] Solid aluminum electrolytic capacitors are electronic components with high conductivity. Solid aluminum electrolytic capacitors are usually equipped with electrode foils, which include positive electrode foils and negative electrode foils. Solid aluminum electrolytic capacitors usually use solid organic semiconductor materials or conductive polymers. The electrolyte material is used as the electrolyte, and a diaphragm electrolytic paper is arranged between the positive and negative electrode foils. The diaphragm electrolytic paper is usually composed of carbonized paper or non-carbonized paper. The positive electrode foil and the negative electrode foil are respectively connected with corresponding guide pins. and electrolytic paper around the guide pins to form a core package. When ...

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Problems solved by technology

[0003] However, the working voltage of solid aluminum electrolytic capacitors with the above structure is mostly below 100V, and it is difficult to raise the voltage to 200V or even higher, and there are two major defects that are difficult to overcome in the preparation method of solid aluminum electrolytic capacitors using the impregnation process: one is The traditional impregnation process limits the improvement of production efficiency and product quality. The viscosity of the existing conductive polymer dispersion is relatively high, which greatly limits the implementation of the impregnation process. It is often difficult for the conductive polymer dispersion to completely penetrate the core bag, even if the voltage The impregnation of a 100V solid capacitor often requires 3 or more impregnations, which is time-consuming and troublesome, and if the impregnation effect is poor, it will lead to uneven distribution of the conductive polymer film on the surface of the aluminum foil, and even diaphragm paper. "Dry band" appears on the surface, which seriously affects the ESR and leakage current of the product, which not only affects the product quality but also reduces the product qualification rate;

[0004] Second, it is difficult to achieve a breakthrough in increasing the working voltage of solid capacitors through the impregnation process. This is not only because the amount of macromolecular auxiliary additives added with the increase in the voltage of the dispersion increases, so that the viscosity of the dispersion and the particle size of the polymer are uniform. Larger, it is difficult to soak the core package, which directly affects the implementation of the impregnation process, and also causes the working voltage of the current solid aluminum electrolytic capacitors to be below 100V, and it is difficult to increase the voltage to 200V or even higher

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