Solid aluminum electrolytic capacitor based on PEDOT: SNC and preparation method thereof

Abstract

A solid aluminum electrolytic capacitor based on PEDOT: SNC comprises a core package formed by winding an anode foil and a cathode foil, a high-molecular conductive polymer film is formed between the anode foil and the cathode foil, and the high-molecular conductive polymer film comprises a PEDOT: SNC film; the weight ratio of the PEDOT to the SNC is (1: 2)-(2: 1). According to the invention, sulfated nanocellulose (SNC) is taken as a dispersing agent, PEDOT: SNC dispersion is prepared through in-situ polymerization, and the high-molecular conductive polymer is obtained after the PEDOT: SNC dispersion is dried. The sulfate group on the sulfated nanocellulose has excellent electronegativity and colloidal stability of the nanocellulose, so that the obtained PEDOT: SNC dispersion shows high stability and has good redispersibility.

Description

technical field [0001] The invention relates to a solid aluminum electrolytic capacitor, in particular to a solid aluminum electrolytic capacitor based on PEDOT:SNC and a preparation method thereof. Background technique [0002] The anode of an aluminum electrolytic capacitor is composed of aluminum metal, and many corrosion pits are formed on the surface of the anode foil, and a dielectric oxide film, that is, an aluminum oxide film, is formed on the surface of the anode foil. The conductive electrolyte in contact with the oxide film acts as a true cathode in the electrolytic capacitor. As the real cathode of the capacitor, the quality of the electrolyte greatly affects the electrical performance of the aluminum electrolytic capacitor. [0003] In order to achieve a large capacity of the aluminum electrolytic capacitor, the electrolytic paper is sandwiched between the anode foil and the cathode foil and wound together to form a core package; the solid aluminum electrolytic...

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Problems solved by technology

One is that the core contains impregnated high molecular conductive polymer monomers, and then polymerized under the action of an oxidizing agent; this method will introduce impurities and make the removal of impurities very troublesome

The second is to directly impregnate the dispersion liquid of high molecular conductive polymer, but the viscosity of general high molecular conductive polymer dispersion is high, which makes it difficult for the core bag to be impregnated into the depth of the core bag, which makes it necessary to reduce the concentration of high molecular conductive polymer. The concentration in the dispersion liquid, so that the amount of polymer conductive polymer impregnated into the core package is reduced, resulting in too many holes in the polymer conductive polymer inside the core package, which affects the cycle performance of solid aluminum electrolytic capacitors

[0005] Patent 202011435148X discloses a new type of solid aluminum electrolytic capacitor and its preparation method; the solid electrolyte used in it is PEDOT:PSS, which is modified by polyallyl glycidyl ether to reduce the viscosity of the polymer conductive polymer, however The presence of p-toluenesulfonic acid will still affect the conductivity of polymer conductive polymers, and p-toluenesulfonic acid itself does not help the dispersion stability of PEDOT, and it still cannot meet the requirements in products with high capacitance and high electrical performance

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