METHOD OF MAKING CATHODE COATING BASED ON ELECTROCONDUCTIVE POLYMER AND SOLID-STATE ELECTROLYTIC CAPACITOR WITH LOW EQUIVALENT SERIES RESISTANCE AND HIGH REALIZATION OF ANODE CAPACITANCE Russian patent published in 2024 - IPC H01G9/52 H01G9/07 H01G9/15 H01G11/48 

FIELD: electrical engineering.

SUBSTANCE: invention relates to the field of electrical engineering, namely to a method of making a cathode coating based on an electroconductive polymer and to a solid-state electrolytic capacitor with low equivalent series resistance (ESR) and high realization of anode capacitance, and can be used in the production of capacitors with a solid electrolyte, the anode of which is a valve metal (tantalum, aluminium, niobium, titanium), and dielectric is oxide of this metal. Result is achieved by a method of producing a cathode coating from an electroconductive polymer by multi-step vapour-phase polymerisation (VPP) of 3,4-ethylenedioxythiophene (EDOT) monomer and impregnation in dispersion PEDOT:PSS (poly(3,4-ethylenedioxythiophene):polystyrene sulphonate), wherein in the process of vapour-phase polymerisation, the surface of the anodes is pre-impregnated with an alcohol solution of the oxidant iron (III) toluene sulphonate, solvent removal and multiple polymerisation with washing of anodes after polymerisation in organic solvents and water in several stages. Solid-state electrolytic capacitor contains at least one anode, which is a sintered pressed volumetric porous body of tantalum powder with a compaction density of 4.5 to 6.5 g/cm³, sintering temperature from 1,200 to 2,100 °C, with specific charge from 1,000 to 300,000 mcC/g, on the surface of which a dielectric film layer is successively formed by electrochemical oxidation, electroconductive layer based on poly 3,4-ethylenedioxythiophene polymer, formed by vapour-phase polymerisation methods and by impregnation method in dispersion PEDOT:PSS, as well as a carbon layer, which is a transition coating, a silver-containing layer, which is a contact coating, which are placed in a non-tight shell.

EFFECT: reduced ESR, improved capacitance characteristics of the electrolytic capacitor in a wide temperature range (from -55 °C to +125 °C).

8 cl, 1 dwg, 2 tbl, 7 ex