High-voltage chip-type conductive polymer solid electrolyte tantalum capacitor and manufacturing method thereof

Abstract

The invention discloses a high-voltage chip-type conducting polymer solid electrolyte tantalum capacitor and a manufacturing method thereof. The method comprises the following steps: using a chip-type tantalum powder raw material to press a tantalum core blank block with a tantalum wire outgoing line, performing vacuum sintering on the tantalum core blank block, and then performing passivating treatment; putting the blank block after sintering in a forming groove filled with a glycol phosphate electrolyte to chemically form a dielectric layer with the thickness of no less than 3000 nm or 3500 nm; permeating a nanoscale poly-3,4-ethylenedioxythiophene particle solution onto gaps and the dielectric layer inside the blank block after the dielectric layer is formed by adopting a repeated impregnation method to form a cathode through deposition, and coating a graphite layer and a silver paste layer on the cathode to form a cathode outgoing layer; welding the tantalum wire outgoing line of the blank block to a shell metal frame lead, packaging by using epoxy resin, and thus obtaining the high-voltage chip-type conducting polymer solid electrolyte tantalum capacitor. The withstand voltage of the manufactured capacitor reaches 50 V or 63 V, the application range of the chip-type electrolyte tantalum capacitor is widened, and the requirement of circuit reliability is met.

Description

technical field [0001] The invention relates to the field of preparation of tantalum capacitors, in particular to a high-voltage sheet-type conductive polymer solid electrolyte tantalum capacitor and a manufacturing method thereof. Background technique [0002] When the capacity and test or use frequency of tantalum capacitors increase to a certain value, the capacity of the product will decrease with the increase of the frequency. When the frequency increases to the same as the resonant frequency of the product, the capacity of the product will be lost and become an inductance. The root of this inevitable physical phenomenon is that the inductance and impedance of the product will become capacitive reactance with the increase of frequency, resulting in a decrease in the capacity of the product. If the impedance of the product is low, especially at high frequency, the inductive reactance of the product is also low, and the capacity of the product will also be maintained to a...

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Problems solved by technology

[0008] Based on the problems in the above-mentioned prior art, the present invention provides a high-voltage chip-type conductive polymer solid electrolyte tantalum capacitor and its manufacturing method, which can produce a chip-type conductive polymer solid electrolyte tantalum capacitor with a rated withstand voltage of 50v or 63v , to solve the problem that the rated withstand voltage of the chip-type conductive polymer solid electrolyte tantalum capacitor produced by the existing method can only reach 35V, which cannot meet the problem of being used in some high-voltage circuits

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