Electrolyte for wide temperature aluminum electrolytic capacitor and preparation method thereof

A technology for aluminum electrolytic capacitors and electrolytes, applied in electrolytic capacitors, liquid electrolytic capacitors, capacitors, etc., can solve the problems that it is difficult to meet the high temperature and wide temperature performance of capacitors, reduce leakage current, increase solubility, and enhance solvation. Effect

Active Publication Date: 2022-01-18
NANTONG RUITAI ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the maximum operating temperature of wide-temperature aluminum electrolytic capacitors currently on the market generally does not exceed 105°C, which is difficult to meet the needs of ever-changing electronic products for high-temperature and wide-temperature performance of capacitors

Method used

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  • Electrolyte for wide temperature aluminum electrolytic capacitor and preparation method thereof
  • Electrolyte for wide temperature aluminum electrolytic capacitor and preparation method thereof
  • Electrolyte for wide temperature aluminum electrolytic capacitor and preparation method thereof

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preparation example Construction

[0023] In this embodiment, an electrolyte solution for a wide temperature aluminum electrolytic capacitor and a preparation method thereof are provided, such as figure 1 As shown, it includes the following steps: S10 mixing the main solvent and the auxiliary solvent at 120-150° C. to obtain a first mixed solution. S20 Adding a solute when the temperature of the first mixed solution is cooled to 90-110° C., and obtaining a second mixed solution after the solute is dissolved. And S30 puts the second mixed solution in N 2 Cook at constant temperature under protection for 30-60 minutes, cool to 70-90°C, add various additives in sequence and keep warm for 60-120 minutes to obtain the electrolyte for wide-temperature aluminum electrolytic capacitors.

[0024] The auxiliary solvent in the step S10 is an alkoxylated sulfolane. The alkoxy chain sulfolane is preferably 3,4-dialkoxy sulfolane. The 3,4-dialkoxy sulfolane has high stability in acidic and alkaline environments due to its...

Embodiment 1

[0029] Add 3-sulfolene to bromine carbon tetrachloride to generate 3,4-dibromosulfolane, after liquid separation and distillation, add a sufficient amount of ethanol / sodium ethoxide to THF, heat and reflux at 50°C for 24 h generates 3,4-diethoxysulfolane. Then evaporate THF at 70°C, remove ethanol at 80°C, and separate 3,4-diethoxysulfolane at 200°C.

[0030]The electrolyte solution for wide-temperature aluminum electrolytic capacitors was prepared according to the following mass fractions: 10% ammonium sebacate, 35% each of ethylene glycol and N-N dimethylformamide, 5% 3-methoxypropionitrile, 3, 4-diethoxysulfolane 5%, nano silicon dioxide 4%, ammonium dihydrogen phosphate 2%, p-nitrobenzoic acid 0.5%, alkyl phosphate 2%, mannitol 1%, 8-hydroxyquinoline 0.5 %.

[0031] Mix the main solvent and auxiliary solvent at 150°C, add the solute when the temperature is cooled to 95°C, and put the solution under N 2 Boil at constant temperature under protection for 50 minutes, cool t...

Embodiment 2

[0033] Add 3-sulfolene to bromine carbon tetrachloride to generate 3,4-dibromosulfolane, after liquid separation and distillation, add a sufficient amount of ethanol / sodium ethoxide to THF, heat and reflux at 50°C for 24 h generates 3,4-diethoxysulfolane. Then evaporate THF at 70°C, remove ethanol at 80°C, and separate 3,4-diethoxysulfolane at 200°C. The synthetic route is as follows figure 2 shown.

[0034] The electrolyte solution for wide-temperature aluminum electrolytic capacitors was prepared according to the following mass fractions: 10% ammonium sebacate, 30% each of ethylene glycol and N-N dimethylformamide, 5% 3-methoxypropionitrile, 3, 4-diethoxysulfolane 15%, nano-silica 4%, ammonium dihydrogen phosphate 2%, p-nitrobenzoic acid 0.5%, alkyl phosphate 2%, mannitol 1%, 8-hydroxyquinoline 0.5 %.

[0035] Mix the main solvent and auxiliary solvent at 150°C, add the solute when the temperature is cooled to 95°C, and put the solution under N 2 Boil at constant temper...

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Abstract

The invention provides an electrolyte solution for a wide temperature aluminum electrolytic capacitor and a preparation method thereof, comprising the following steps: S10 mixing a main solvent and an auxiliary solvent at 120-150°C to obtain a first mixed solution; S20 waiting for the second When the temperature of the first mixed solution is cooled to 90~110°C, add the solute, and obtain the second mixed solution after the solute is dissolved; S30 put the second mixed solution under N 2 Cook at constant temperature under protection for 30-60 minutes, cool to 70-90°C, add various additives in sequence and keep warm for 60-120 minutes to obtain an electrolyte solution for wide-temperature aluminum electrolytic capacitors; wherein, the auxiliary solvent is an alkoxy chain Sulfolane. An electrolyte solution for a wide temperature aluminum electrolytic capacitor and a preparation method thereof of the present invention use a sulfone-based compound with a branched ring structure as an auxiliary solvent to increase the conductivity of the electrolyte solution and greatly reduce the leakage current of the capacitor , At the same time, since the auxiliary solvent contains more oxygen atoms, it can provide more repair factors for the anodized film, so that the aluminum electrolytic capacitor can be used stably for a long time in a high temperature environment.

Description

technical field [0001] The invention relates to the technical field of electronic chemical industry, in particular to an electrolyte solution for wide-temperature aluminum electrolytic capacitors and a preparation method thereof. Background technique [0002] Aluminum electrolytic capacitors are one of the basic components of various electronic products. In recent years, aluminum electrolytic capacitors have been widely used in high-precision fields such as computers, military, aerospace, high-speed rail, and precision instruments. For example, with the advent of 5G technology, communication base stations must be used in various temperature environments, which puts higher requirements on the temperature range of aluminum electrolytic capacitors. When the aluminum electrolytic capacitor is exposed to high temperature and high pressure environment for a long time, the dense oxide film on the surface of the anode is easily destroyed, causing the product to be broken down, and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G9/035H01G9/145
CPCH01G9/145H01G9/035
Inventor 原鲜霞刘康洪闻一婵薛瑄武
Owner NANTONG RUITAI ELECTRONICS
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