Multilayer polymer capacitor based on n-type conductive polymer, and preparation method therefor

By treating the surface of the capacitor monolayer with a surface modifier and growing an n-type conductive polymer film in situ, combined with a carbon conductive layer and a silver electrode, the problem of n-type conductive polymer penetrating oxide micropores in MLPC was solved, thus realizing a chip multilayer capacitor with low ESR and high stability.

WO2026007497A1 Publication Date: 2026-01-08NANTONG JIANGHAI CAPACITOR CO LTD +1
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Patent Information

Application Number
PCT/CN2025/089205
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2024-07-01
Filing Date
2025-04-16
Publication Date
2026-01-08

AI Technical Summary

Technical Problem

In existing multilayer polymer capacitors (MLPCs), n-type conductive polymers are difficult to penetrate oxide micropores, resulting in high contact resistance and poor operational stability, making it difficult to meet the long-term operation requirements under high temperature and high humidity environments.

Method used

By treating the capacitor with a surface modifier, an n-type conductive polymer film is grown in situ, combined with a carbon conductive layer and a silver electrode, to achieve filling and tight coverage of oxide micropores, reduce the equivalent series resistance (ESR), and improve stability.

Benefits of technology

It effectively reduces the ESR of MLPC, improves its working stability in high temperature and high humidity environments, and meets the long-term operation requirements of equipment such as servers and 5G base stations.

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Abstract

Disclosed in the present application are a multilayer polymer capacitor based on an n-type conductive polymer, and a preparation method therefor. The preparation method comprises the following steps: acquiring a single capacitor having an oxide dielectric layer on the surface, cleaning and drying the surface of the single capacitor, impregnating same with a surface modifier solution, and then drying same, so as to obtain a surface-modified single capacitor; sequentially impregnating the surface-modified single capacitor with a polymerizable monomer solution and an oxidant solution, performing drying after each instance of impregnation, and repeating the process 6-10 times until an n-type conductive polymer film is formed; impregnating the single capacitor having the n-type conductive polymer film with an outer film layer solution, and heating and drying same to achieve the complete growth of an n-type conductive polymer on an oxide film; and impregnating same with a conductive carbon paste and a silver paste, and then laminating and extruding same, so as to obtain a multilayer polymer capacitor. While the equivalent series resistance of the multilayer polymer capacitor is reduced, the working stability of the multilayer polymer capacitor in a high-temperature and high-humidity environment is effectively improved.
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