Electrolytic capacitor paper is a highly specialized cellulose-based material mainly used in aluminum electrolytic capacitors as an adsorption carrier for the electrolyte, which together with the electrolyte forms the cathode of the capacitor.

Its core functions include:

Electrolyte adsorption and storage: Absorption of electrolyte (e.g., ethylene glycol, boric acid solution, etc.) through the porous fiber structure, forming a conductive pathway.

Isolation and support: Forming a physical isolation layer between the anode aluminum foil and electrolyte to prevent short circuits while maintaining the stability of the capacitor structure.

Electrochemical performance optimization: Reduce the equivalent series resistance (ESR) through material purity and microstructure design to improve high frequency performance and energy efficiency.