Electrochemical capacitor

By using activated carbon containing more than 10 ppm of the first metal and carboxyalkyl cellulose ammonium salt as a dispersant in electrochemical capacitors, and combining mesoporous and microporous structures, the problem of deterioration of float charge characteristics under the limitation of metal content in activated carbon was solved, and the stability and performance of the capacitor were improved.

CN122459901APending Publication Date: 2026-07-24PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
View PDF 1 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
Filing Date
2024-12-05
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

In existing technologies, despite limiting the metal content in activated carbon, the float charge characteristics of electrochemical capacitors are still prone to deterioration, and the correlation between activated carbon and the performance of electrochemical capacitors is not sufficiently studied.

Method used

An electrode structure containing activated carbon and a dispersant is adopted, wherein the activated carbon contains more than 10 ppm of a first metal, and the dispersant is carboxyalkyl cellulose or its ammonium salt, preferably CMC-NH4, which combines mesoporous and microporous structures to improve the dispersion stability and bonding strength of the slurry.

Benefits of technology

This improves the float charge characteristics of the electrochemical capacitor, reduces the increase in internal resistance, enhances the thickness-direction bonding strength of the active layer, and ensures the stability and performance of the capacitor.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN122459901A_ABST
    Figure CN122459901A_ABST
Patent Text Reader

Abstract

The disclosed electrochemical capacitor has a pair of electrodes and an electrolyte. At least one of the pair of electrodes includes a current collector and an active layer disposed on a surface of the current collector. The active layer includes activated carbon and a dispersant. The activated carbon includes a first metal. The ratio of the first metal in the activated carbon is 10 ppm or more on a mass basis. The dispersant includes at least one selected from the group consisting of carboxyalkyl cellulose and an ammonium salt of carboxyalkyl cellulose.
Need to check novelty before this filing date? Find Prior Art

Citation Information

Patent Citations

  • Activated carbon, method for production thereof, polarizing electrode and electric double layer capacitor

    JP2008297201A