Working electrolyte for wide temperature high voltage aluminium electrolytic capacitor and method for making same thereof

Abstract

The invention discloses working electrolyte for the aluminum electrolytic capacitor with wide working temperature range and high voltage and the manufacturing method. The invention includes the following materials (calculating with weight percent): 60 percent to 80 percent glycol, 5 percent to 20 percent Gamma butyrolactone, 0 percent to 5 percent water, 2 percent to 5 percent ammonium sebacate, 5 percent to 10 percent isosebacic acid ammonium, 0 percent to 5 percent sebacic acid, 0.1 percent to 2 percent ammonium dihydrogen phosphate, 0.1 percent to 1 percent citric acid, 0.1 percent to 2 percent p-nitrobenzoic acid and 5 percent to 20 percent polyethylene glycol. The manufacturing method is as follows: (1) well-mixing the glycol, Gamma butyrolactone and water and heating to 60 DEG C through 90 DEG C; (2) adding the ammonium sebacate, sebacic acid, ammonium dihydrogen phosphate, citric acid, p-nitrobenzoic acid, polyethylene glycol to the mixed solvent and well-mixing; (3) after ample dissolution of the materials, keeping the temperature in the step (3) for five through thirty minutes; (4) adding the isosebacic acid ammonium to the mixture and keeping the temperature in the step (3) for five through thirty minutes, and stopping heating and natural cooling in the air, and obtaining the aluminum electrolytic capacitor with wide working temperature range and high voltage. The product increases the conductivity and the sparking voltage of the working electrolyte and reduces the production cost.

Description

(1) Technical field: [0001] The invention relates to a working electrolyte for an aluminum electrolytic capacitor, in particular to a working electrolyte for a wide temperature and high voltage aluminum electrolytic capacitor; the invention also relates to a preparation method for the working electrolyte for a wide temperature and high voltage aluminum electrolytic capacitor. (two) background technology: [0002] The electronic components industry is the foundation of the information industry, and capacitors are the main components of electronic components, accounting for about 40% of electronic components. At present, capacitor products are mainly divided into three categories: electrolytic capacitors, ceramic capacitors, and organic film capacitors, of which aluminum electrolytic capacitors account for about 36.8%. Due to the characteristics of aluminum electrolytic capacitors (high specific capacity and very high working electric field strength), Make it one of the electr...

AI Technical Summary

Problems solved by technology

The maximum operating temperature of this system is 85°C. At high temperature, boric acid tends to undergo esterification reaction with ethylene glycol to generate a large amount of water, which leads to excessive vapor pressure of the electrolyte at high temperature, and the capacitor is easy to swell or even burst and fail. Boric acid is easy to precipitate at low temperature, so the electrolyte of this system is difficult to meet the requirements of manufacturing wide temperature and high voltage aluminum electrolytic capacitors

Later, people used straight-chain organic dicarboxylic acids and their ammonium salts as electrolytes, but as the number of carbon atoms increased, the solubility of straight-chain organic dicarboxylic acids in ethylene glycol gradually decreased, resulting in a relatively low solute content in the electrolyte. Less, so that the conductivity becomes smaller, and because the carbon chain of the straight-chain organic dicarboxylic acid is longer, affected by the steric effect, the boosting speed of the electrolyte is slow, and the oxidation efficiency is low. The capacitor produced by it The loss tangent is larger

And the high-temperature stability of the electrolyte is poor when the straight-chain organic dicarboxylic acid is used alone as the electrolyte