Electrolyte for aluminum electrolytic capacitor

Abstract

The invention relates to an electrolyte for an aluminum electrolytic capacitor. The electrolyte for the aluminum electrolytic capacitor is prepared from 10%-15% of a main electrolyte, 5%-10% of an auxiliary electrolyte, 65%-73% of a solvent, 10%-20% of a sparking voltage increasing agent, 0.1%-1% of a waterproof mixture and 0.1%-1% of a hydrogen eliminating agent, wherein 2,5-dimethyl hexanedioic acid serves as the main electrolyte, benzoic acid serves as the auxiliary electrolyte, and ethylene glycol serves as the solvent. The electrolyte for the aluminum electrolytic capacitor has the advantages that due to the fact that the 2,5-dimethyl hexanedioic acid serves as the main electrolyte, the solubility and the thermostability of the 2,5-dimethyl hexanedioic acid are better in the ethylene glycol, and medium-pressure or high-pressure aluminum electrolytic capacitors containing the electrolyte has the advantages of being long in service life and good in low-temperature performance.

Description

Technical field [0001] The present invention relates to an electrolyte for aluminum electrolytic capacitors, and particularly to an electrolyte that can be advantageously used as a driving electrolyte for aluminum electrolytic capacitors for medium and high voltage. Background technique [0002] The electrolyte of currently known high-voltage aluminum electrolytic capacitors is based on ethylene glycol as the main solvent, and inorganic compounds such as boric acid or ammonium pentaborate as the main solute. Such an electrolyte has the problem of low conductivity. With the advancement of science and technology, straight-chain diacids such as azelaic acid and sebacic acid or their ammonium salts are used as the main solute of the electrolyte. Such electrolytes have the problem of poor high-temperature thermal stability. After a long period of high temperature, its electrical conductivity decreases greatly, which leads to an increase in the impedance value of the capacitor and aff...

AI Technical Summary

Problems solved by technology

Such an electrolyte has the problem of low conductivity

With the advancement of science and technology, linear diacids such as azelaic acid and sebacic acid or their ammonium salts are used as the main solute of the electrolyte. Such electrolytes have poor thermal stability at high temperatures.

After a long-term high temperature, its conductivity drops greatly, which leads to an increase in the impedance value of the capacitor and affects the life of the capacitor. Among them, boric acid or its salt will react with ethylene glycol at high temperature to produce water, which affects the life of the capacitor. Ammonium diacid, ammonium dodecanoate and their acids have low solubility in ethylene glycol, less than 6% at room temperature, which makes the low-temperature performance of aluminum electrolytic capacitors poor

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