Flame-retardant electrolyte and manufacturing method thereof

Abstract

The invention relates to a flame-retardant electrolyte and a manufacturing method thereof, wherein the flame-retardant electrolyte comprises, by weight percent, 63 percent to 86.5 percent of ethylene glycol, 1 percent to 3 percent of silicon dioxide, 5 percent to 15 percent of boric acid, 5 percent to 10 percent of ammonium pentaborate, 1 percent to 5 percent of mannitol, 0.5 percent to 2.0 percent of o-nitroanisole and 1 percent to 2 percent of phosphoric acid; the manufacturing method comprises: (a). heating the ethylene glycol to 60 to 75 DEG C, sequentially adding the boric acid, the ammonium pentaborate and the mannitol, continuously heating to 95 to 105 DEG C, and stirring till the boric acid, the ammonium pentaborate and the mannitol is completely dissolved; (b). adding the silicon dioxide into the solution and continuously stirring till the solution is completely clarified; (c). and cooling the solution to 65 to 70 DEG C, adding the o-nitroanisole and the phosphoric acid, and naturally cooling to acquire the electrolyte. According to the invention, the electrolyte has the performance to resist high temperature and high voltage and the hydrogen amount produced during the working process of an electrolytic capacitor is also reduced; and the vapor pressure of the electrolyte can be lowered, thus the electrolyte provided herein has flame-retardant performance.

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