Electrolyte for high-conductance and long-life aluminum electrolytic capacitor and preparation method thereof

Abstract

The invention relates to the technical field of electrolytes and particularly relates to an electrolyte for a high-conductance and long-life aluminum electrolytic capacitor and a preparation method thereof. The electrolyte is composed of the following raw materials in weight part: 8-12 parts of ammonium benzoate, 6-10 parts of ammonium adipate, 4-6 parts of polyethylene glycol, 1.5-2.5 parts of mannitol, 2-3 parts of boric acid, 2.5-3.5 parts of ammonium sebacate, 0.2-0.4 part of ammonium hypophosphite, 0.6-1.0 part of p nitrophenol, 3-5 parts of ammoniacal liquor, 0.1-0.3 part of EDTA and 55-75 parts of glycol. According to the technical scheme of the invention, based on the interaction of the above-described materials, the weight proportion of all the raw materials is strictly controlled, and the scintillation voltage of the prepared electrolyte is up to 380V. The conductivity of the prepared electrolyte is up to 5.5ms/cm. meanwhile, the electrolyte is good in electrochemistry characteristics, high in conductivity and long in service life, thus being applied to the manufacture of aluminum electrolytic capacitors.

Description

technical field [0001] The invention relates to the technical field of electrolytes, in particular to an electrolyte for high-conductivity and long-life aluminum electrolytic capacitors 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 and the expansion of the application range of aluminum electrolytic capacitors, higher requirements are put forward for their performance. Electronic products such as switching power supplies and energy-saving lamps have high requirements on the safety performance of high-voltage electrolytic capacitors. In the filter circuit, the capacitor is subjected to high voltage and high ripple current. If the power supply is unstable or overvoltage is applied, the capacitor will be damaged, catch fire, burn and other accidents. The electrolyte of an aluminum electrolytic capacitor...

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Problems solved by technology

The working electrolyte prepared in this way has the problem of low conductivity, and boric acid and its salts are easy to undergo esterification reaction with ethylene glycol at high temperature to generate a large amount of condensed water, which causes the moisture content inside the electrolyte to increase, and the electrolyte's The vapor pressure increases, and the internal pressure of the capacitor increases, causing the capacitor to open the valve and fail; 2. Using ethylene glycol as the main solvent, using direct-linked hydrocarbon saturated dicarboxylic acids such as azelaic acid, sebacic acid or dodecanedioic acid and their Salt is the electrolyte of the electrolyte. Although this type of electrolyte avoids a part of the esterification reaction, due to the low solubility of this type of straight-chain alkanes in ethylene glycol, the impedance of the product is large and the ripple is large. It is easy to generate heat under high temperature and make the solvent volatilize, thus creating a vicious cycle, causing the capacitor to dry out and fail. At the same time, linear alkanes are prone to amidation side reactions at high temperatures to generate water, which is also easy to cause early failure of the capacitor; 3. Use some branched chains Acids or their salts, such as reported 1,6-DDA and its salts and 2-butylsuberic acid and its salts, such branched carboxylic acids and their salts have improved solubility in solvents compared to straight-chain alkanes , thus producing effects to a certain extent, but at the same time, this kind of acid or its salt mainly relies on imports, so the cost is high and there are many constraints