A kind of flame retardant electrolyte and preparation method thereof

Abstract

The invention relates to a flame-retardant electrolyte and a preparation method thereof. The composition comprises: by weight percentage, 63%-86.5% of ethylene glycol, 1%-3% of silicon dioxide, 5%-15% of boric acid, and 5% of ammonium pentaborate. %-10%, mannitol 1%-5%, o-nitroanisole 0.5-2.0% and phosphoric acid 1-2%. The preparation method includes: (1) heating ethylene glycol to 60-75°C, then sequentially adding boric acid, ammonium pentaborate, and mannitol, continuing to heat to 95-105°C, and stirring until completely dissolved; (2) Silicon is added to the solution and stirred continuously until it is completely clear; (3) Cool the solution to 65-70°C, add o-nitroanisole and phosphoric acid, and cool naturally to obtain an electrolyte. The electrolytic solution of the invention not only can withstand high temperature and high pressure, but also can reduce the amount of hydrogen generated in the working process of the electrolytic capacitor, can reduce the vapor pressure of the electrolytic solution, and has flame retardancy.

Description

technical field [0001] The invention belongs to the field of electrolytes, in particular to a flame-retardant electrolyte and a preparation method thereof. Background technique [0002] The electrolyte is the cathode of the aluminum electrolytic capacitor, and its performance has a certain influence on the performance of the aluminum electrolytic capacitor. The existing electrolyte formula is mainly composed of solute and solvent. Chinese patent 99121506.0 (aluminum electrolytic capacitor) invented a non-flash point aluminum electrolytic capacitor with little appearance change and characteristic deterioration even if it is used at high temperature for a long time, and has high reliability. The water content of its electrolyte is 20-90wt%, the electrolyte contains ammonium formate, ammonium acetate, ammonium lactate, ammonium glycolate, ammonium oxalate, ammonium succinate, ammonium malonate, ammonium adipate, ammonium benzoate, ammonium glutarate, More than one compound in ...

AI Technical Summary

Problems solved by technology

Chinese patent 99121506.0 (aluminum electrolytic capacitor) invented a non-flash point aluminum electrolytic capacitor with little appearance change and characteristic deterioration even if it is used at high temperature for a long time, and has high reliability. The water content of its electrolyte is 20-90wt%, the electrolyte contains ammonium formate, ammonium acetate, ammonium lactate, ammonium glycolate, ammonium oxalate, ammonium succinate, ammonium malonate, ammonium adipate, ammonium benzoate, ammonium glutarate, More than one compound in ammonium azelate is used as the main electrolyte, and more than 1 wt% of one or more compounds selected from organic carboxylic acids with specific structures or ammonium salts thereof are contained in addition, and the freezing point of the above-mentioned electrolyte is below -10°C, improving It has improved its withstand voltage and high temperature performance, but failed to suppress the generation of hydrogen

[0003] Chinese patent 02805612.4 (electrolytic capacitor and electrolytic capacitor driving electrolyte) discloses the absorption of hydrogen generated by the reaction of aluminum electrode foil and electrolyte, and the addition of compounds containing unsaturated bonds to make electrolytic capacitors with electrical characteristics and performance under high-temperature storage conditions. Capacitors with good characteristics provide an electrolytic capacitor containing an unsaturated compound that causes a hydrogenation reaction inside, and a solvent that is composed of 10 to 80 wt% of an organic solvent and 90 to 20 wt% of water relative to the contained solvent, and is selected from the group consisting of carboxylic Electrolytic solution of at least one electrolyte of acid or its salt and inorganic acid or its salt, containing one or more unsaturated compounds soluble in water-soluble or polar solvents and protic polar solvents, the Although the formula can reduce the amount of hydrogen, it has no obvious effect on improving the performance of high temperature and high pressure resistance