Electrolyte of high-voltage aluminum electrolytic capacitor and preparation method of electrolyte

Abstract

The invention discloses electrolyte of a high-voltage aluminum electrolytic capacitor. The electrolyte is characterized by comprising a main solvent, an auxiliary solvent, a solute and a spark voltage increasing agent, wherein the main solvent comprises one or more of ethylene glycol, gamma-butyrolactone, DMF and diglycol monobutylether; the auxiliary solvent comprises two or more of polyethylene glycol 200, polyethylene glycol 400, a nanosilicon dioxide solution, glycerol, propylene carbonate and ethylene carbonate; the solute comprises two or more of ammonium sebacate, ammonium adipate, adipic acid, boracic acid, ammonium pentaborate, ammonium azelate, ammonium dodecanedioate, ammonium formate, ammonium benzoate, mannitol, sorbitol, citric acid and quadrol. The electrolyte can be applied to 600V ultrahigh voltage, is stable in performance, low in viscosity, high in conductivity and beneficial to volume production, and can reduce the production cost.

Description

technical field [0001] The invention relates to an aluminum electrolytic capacitor, in particular to an electrolytic solution of a high-voltage aluminum electrolytic capacitor and a preparation method thereof. Background technique [0002] Aluminum electrolytic capacitors are one of the basic components of electronic products. With the continuous improvement of the quality of electronic products, higher and higher requirements are put forward for the performance of aluminum electrolytic capacitors such as operating voltage, service life, and upper limit operating temperature. At present, many well-known brand capacitor manufacturers such as Japan, which are in the forefront of the world, have successively launched products with a rated working voltage greater than 600V, and most of the new product series they have launched are in the ultra-high voltage aspect. It can be seen that ultra-high voltage aluminum electrolytic capacitors It is a trend of future development. Althou...

AI Technical Summary

Problems solved by technology

At present, for the development of ultra-high voltage (greater than 600V) electrolytes, long-chain carboxylate ammonium salts or carboxylic acids are mainly used in preference, but the long-carbon chain carboxylate ammonium salts or carboxylic acids currently used in research and development mainly come from abroad, and domestic The production technology is not mature, so the production cost of the electrolyte will be high, and it is not suitable for actual production

In addition, ammonium carboxylate salts or carboxylic acids with long carbon chains have low solubility due to their long carbon chains, which will lead to low conductivity of the electrolyte.

Patent CN103839682A provides a 600V aluminum electrolytic capacitor; patent CN103811183A provides a 630V aluminum electrolytic capacitor; patent CN103794369A provides a 700V aluminum electrolytic capacitor; Carbon chain carboxylate ammonium salt or carboxylic acid is the main solute, the conductivity of the electrolyte is relatively low, and the product loss is relatively large