Solid-state aluminum electrolytic capacitor with high capacitor extraction rate and preparation method thereof

A technology of aluminum electrolytic capacitors and capacitors, which is applied in the direction of solid electrolytic capacitors, electrolytic capacitor manufacturing, electrolytic capacitors, etc., can solve the problems of poor film uniformity, poor film thickness uniformity, and low lead-out rate of capacitors, and achieve lead-out rate and leakage current performance Enhanced effect

Active Publication Date: 2020-04-10
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the film thickness uniformity of PEDOT:PSS is poor. This is because the molecular weight of PEDOT is small, while the molecular weight of PSS is high. There are some sites on the main chain of PEDOT that are not combined with the short chain of PEDOT. In order to maintain the stability of the dispersion, PEODT:PSS The PSS in the system is usually excessive, which leads to the poor uniformity of the PEDOT:PSS film; it also makes the lead-out rate of the capacitor not high, and the leakage current is large
At the same time, although the conductivity of PEDOT:PSS is higher, for capacitors, the higher the conductivity of the conductive polymer, the smaller the internal resistance of the solid aluminum electrolytic capacitor and the stronger the ability to withstand ripple current. So for PEDOT:PSS, there is still room for improvement in conductivity

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  • Solid-state aluminum electrolytic capacitor with high capacitor extraction rate and preparation method thereof
  • Solid-state aluminum electrolytic capacitor with high capacitor extraction rate and preparation method thereof

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Embodiment 1

[0033] A solid aluminum electrolytic capacitor with a high capacitance extraction rate, comprising a core package sealed in an outer casing, the core package is formed by winding an anode foil, non-carbonized electrolytic paper and a cathode foil, and the anode foil and the cathode foil are wound Filled with PEDOT doped with sodium lignosulfonate (LS), ie PEDOT:LS.

[0034] In the present invention, because the electrical conductivity of PEDOT:LS film is lower than PEDOT; So in order to reduce the ESR of capacitor, can be attached with PEDOT on electrolytic paper, between described electrolytic paper and anode foil and between electrolytic paper and negative electrode The foils are filled with PEDOT doped with sodium lignosulfonate, PEDOT:LS.

[0035] Such as figure 2 As shown, PEDOT:PSS is a mixture of rigid PEDOT chains and flexible PSS chains. During the molding process of the dispersion, PEDOT and PSS tend to separate to form stable respective continuous phases to mainta...

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Abstract

A solid-state aluminum electrolytic capacitor with a high capacitor extraction rate comprises a core package sealed in a shell, the core package is formed by winding an anode foil, non-carbonized electrolytic paper and a cathode foil, and PEDOT, namely PEDOT:LS doped with sodium lignin sulfonate, is filled between the anode foil and the cathode foil. The conductivity of the PEDOT:LS film formed onthe core package is similar to that of the traditional PEDOT:PSS film, but the uniformity of the PEDOT: LS film is much higher than that of the PEDOT: PSS film, so that the extraction rate and the leakage current performance of the capacitor are greatly improved.

Description

technical field [0001] The invention relates to a solid aluminum electrolytic capacitor, in particular to a solid aluminum electrolytic capacitor with high capacitance extraction rate and a preparation method thereof. Background technique [0002] The electrolyte in the low-voltage solid capacitor is impregnated with the monomer, impregnated with the oxidant, and then polymerized into the inside of the capacitor element, and filled with PEDT produced by chemical in-situ polymerization. Since the oxidizing agent has a certain corrosiveness to the oxide film of the anode foil, the withstand voltage value of the solid capacitor will be lower and the leakage current will be larger. [0003] In order to solve the above problems, patent 201610302908.7, a new type of solid aluminum electrolytic capacitor and its production method, proposes that the gap between the electrolytic paper and the anode foil and the electrolytic paper and the cathode foil is filled with PEDOT:PSS. Howeve...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): H01G9/00H01G9/012H01G9/04H01G9/15
CPCH01G9/151H01G9/04H01G9/012H01G9/0029
Inventor贾明刘芳洋刘一民汤水艾亮
OwnerCENT SOUTH UNIV