Wide temperature range high voltage aluminum electrolysis capacitor working electrolyte and preparation thereof

Abstract

The invention relates to a working electrolyte of a wide-temperature and high-pressure aluminum electrolytic capacitor, which comprises solvents glycol and r-butyrolactone, solutes 1,6-Dodecanedioic acid (1,6-DDA), dimethylamine and additive phosphoric acid, and pure water, and the weight percentages of the components are respectively 10 to 37 percent : 50 to 68 percent : 8 to 12 percent : 3 to 5 percent : 0.1 to 0.6 percent : 2 to 4 percent. The preparation of the working electrolyte comprises the following steps: (1), 1,6-DDA is poured into a mixed solvent of glycol and r-butyrolactone and stirred and mixed, and then dimethylamine liquefied gas is pumped in; and the mixture is continuously stirred; (2), the electrolyte already reacted in step (1) and on the whole clarified is continuously heated to a temperature of 65 to 80 DEG C; then additive phosphoric acid is added; and finally, pure water is added, and the electrolyte is naturally cooled. Materials utilized in the working electrolyte has the advantages of low cost, good solubility and better freezing resistance performance, thereby causing the working electrolyte to be provided with good forming ability and high temperature stability.

Description

technical field [0001] The invention belongs to the field of electrolyte and its preparation, in particular to a working electrolyte for a wide temperature and high voltage aluminum electrolytic capacitor and a preparation method thereof. Background technique [0002] Electrolytic capacitors are one of the basic components of electronic products. With the development of large-screen color TVs, automotive electronics, frequency conversion technology, energy-saving lamps and communication electronics, the demand for high-voltage aluminum electrolytic capacitors is increasing. [0003] The electrolyte is the cathode of the aluminum electrolytic capacitor. It can repair the defects and defects of the anodic oxide film, and at the same time, it plays a decisive role in the temperature range, service life, reliability and other electrical properties of the aluminum electrolytic capacitor. At present, the working electrolytes used in industrial high-voltage aluminum electrolytic ca...

AI Technical Summary

Problems solved by technology

The former is likely to cause the capacitor to bulge and fail due to the high vapor pressure; the latter has a large capacitor loss due to low conductivity

The electrolytes of the two systems cannot well meet the requirements of wide temperature and high voltage aluminum electrolytic capacitors for the operating temperature range and voltage