Solid-liquid mixed aluminum electrolytic capacitor and preparation method thereof

Abstract

The invention provides a solid-liquid mixed aluminum electrolytic capacitor that comprises an aluminum shell and a core body arranged in the aluminum shell, and that is characterized in that the corebody comprises a cylindrical structure formed by winding a first electrolytic paper or a first diaphragm, a negative electrode carbon foil, a second electrolytic paper or a second diaphragm and a positive electrode formed foil; one end of an anode guide pin is connected with the positive electrode formed foil; one end of a cathode guide pin is connected with the negative electrode carbon foil; theother ends of the anode guide pin and the cathode guide pin are exposed out of the aluminum shell,, conductive polymers are arranged on the surfaces of the first electrolytic paper or the first diaphragm, the negative electrode carbon foil, the second electrolytic paper or the second diaphragm and the positive electrode formed foil, and electrolyte is adsorbed on the first electrolytic paper or the first diaphragm and the second electrolytic paper or the second diaphragm. According to the invention, the capacity extraction rate is high, the ESR is ultralow, and the capacity attenuation is low.

Description

technical field [0001] The invention relates to a solid-liquid mixed aluminum electrolytic capacitor and a preparation method thereof, belonging to the technical field of aluminum electrolytic capacitors. Background technique [0002] The solid-liquid mixed aluminum electrolytic capacitors currently on the market are composed of positively polarized aluminum foil, negatively polarized aluminum foil, and positively and negatively polarized aluminum foil. There is electrolytic paper or diaphragm between the electrolytic paper or diaphragm, and conductive polymer and electrolyte are adsorbed on the electrolytic paper or diaphragm. , wherein, the surface of negatively polarized aluminum foil has corroded micropores, and the surface of corroded micropores has a layer of oxide film coating of aluminum oxide. A positive guide pin is provided on the positive aluminum foil, and a negative guide pin is provided on the negative aluminum foil. The positive and negative guide pins pass t...

AI Technical Summary

Problems solved by technology

The aluminum electrolytic capacitor with this structure uses chemically formed negative electrode foil for the negative electrode, and there is a problem of bonding between the oxide film on the surface, the electrolyte, and the conductive polymer, which leads to an increase in the internal resistance of the solid-liquid mixed aluminum electrolytic capacitor; at the same time The capacity can only be extracted by the cooperation of the micropores on the surface of the negative electrode foil and the electrolyte. The size and depth of the micropores will affect the capacity extraction, so there will be a problem of insufficient capacity extraction, and it will also show a sharp decline in capacity in long-term use. fast failure problem

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