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Electrolytes used in aluminum electrolytic capacitors

The electrolytes in aluminum electrolytic capacitors induces capacitance by permeating the etching layers*1 of the electrode foil surface and serving as a true cathode*2.
The main electrolyte solvent used is ethylene glycol (EG) or γ-butyrolactone (GBL).
*1:
Layer with its surface area expanded by using electrochemical processing to form surface undulations.
*2:
The base metal part of the anode foil acts as the true anode, the aluminum oxide on the surface of the anode foil acts as the dielectric, and the electrolyte in contact with the anode foil acts as the true cathode.
electrolyte
At present, we do not manufacture or sell quaternary salt type aluminum electrolytic capacitors, which use quaternary alkylammonium salts as cations in the electrolyte.

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