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

An aluminum electrolytic capacitor, high-voltage-resistant technology, applied in the direction of electrolytic capacitors, liquid electrolytic capacitors, capacitors, etc., can solve the problems of reduced conductivity, reduced flash voltage, increased moisture content, etc., to achieve good resistance to large ripple current performance, improve Effect of less flashover voltage and appearance change

Inactive Publication Date: 2020-03-27
NANTONG RUIDA ELECTRONICS MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For ultra-high voltage aluminum electrolytic capacitors used at this stage, in order to obtain high flash voltage, in addition to relying on the performance of the main solute itself of the electrolyte, it is generally necessary to add a flash voltage booster, such as polyethylene glycol, ammonium polyacrylate, poly One or more of vinyl alcohol phosphate, nano-inorganic oxide particles and polyethylene oxide propylene oxide ether cannot increase the conductivity of the electrolyte due to its non-conductivity
At the same time, with the prolongation of use time, the composition of the electrolyte will undergo chemical changes, resulting in an increase in moisture content, a decrease in conductivity, a decrease in flashover voltage, and an increase in the rate of change of capacitor loss factor DF, etc.
Due to the reduction of the flashover voltage of the electrolyte, under high temperature load, the electrode foil is prone to ignition, the oxide film is destroyed, and the anode is corroded.
With the rapid deterioration of the relevant parameters of the capacitor, the capacitor will eventually fail, and its reliability cannot adapt to the development trend of future capacitors.

Method used

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

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preparation example Construction

[0046] The present invention also provides a preparation method of an electrolyte for a high-voltage aluminum electrolytic capacitor, comprising the following steps:

[0047] (1) Weigh 5-30 parts of solute, 40-60 parts of main solvent, 10-30 parts of auxiliary solvent and 03.-10 parts of additive, wherein, the solute is the ammonium of the high molecular polymer shown in formula (I) Salt,

[0048]

[0049] Its molecular weight distribution range is 20000-100000;

[0050] (2) Mix 70%-85% of the main solvent and auxiliary solvent, heat to 50-80°C, add 10%-20% of the solute, stir until the mixture is uniform, and obtain the mixed solution A;

[0051] (3) Continue heating the mixed solution A to 130-160°C and keep it warm for 30-70min;

[0052] (4) Cool the heated mixed solution A to 90-110°C, add 80%-90% solute, stir until mixed evenly, obtain mixed solution B, and keep it warm for 60-90min;

[0053] (5) Add the additive to 15%-30% of the main solvent and the auxiliary solv...

Embodiment 1

[0058] The mass percent of described solute, main solvent, auxiliary solvent and additive is:

[0059]

[0060] The preparation method of the electrolytic solution for the high-voltage aluminum electrolytic capacitor comprises the following steps:

[0061] (1-1) Weigh 18 parts of solute, 55 parts of ethylene glycol, 25 parts of ethylene glycol monobutyl ether, 0.3 part of p-nitrobenzoic acid, 0.7 part of ammonium phosphate and 1 part of polymerized fatty acid;

[0062] (1-2) Mix 80% ethylene glycol and ethylene glycol monobutyl ether, heat to 58°C, add 10% solute, stir until the mixture is uniform, and obtain a mixed solution A;

[0063] (1-3) Continue heating the mixture A to 140°C and keep it warm for 70min;

[0064] (1-4) Cool down the heated mixed solution A to 90°C, add 90% of the solute, stir until mixed evenly, obtain the mixed solution B, and keep it warm for 86 min;

[0065] (1-5) Add 0.3 part of p-nitrobenzoic acid, 0.7 part of ammonium phosphate salt and 1 part o...

Embodiment 2

[0068] The mass percent of described solute, main solvent, auxiliary solvent and additive is:

[0069]

[0070] The preparation method of the electrolytic solution for the high-voltage aluminum electrolytic capacitor comprises the following steps:

[0071] (2-1) Weigh 25 parts of solute, 50 parts of ethylene glycol, 18 parts of γ-butyrolactone, 0.7 part of p-nitrobenzyl alcohol, 1.3 parts of ammonium hypophosphite and 5 parts of polypropylene glycol;

[0072] (2-2) Mix 80% ethylene glycol and ethylene glycol monobutyl ether, heat to 58°C, add 10% solute, stir until the mixture is uniform, and obtain a mixed solution A;

[0073] (2-3) Continue heating the mixture A to 140°C and keep it warm for 70min;

[0074] (2-4) Cool down the heated mixed solution A to 90°C, add 90% of the solute, stir until evenly mixed to obtain the mixed solution B, and keep it warm for 86 min;

[0075] (2-5) Add 0.3 part of p-nitrobenzoic acid, 0.7 part of ammonium phosphate salt and 1 part of poly...

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Abstract

The invention provides an electrolyte for a high-voltage-resistant aluminum electrolytic capacitor and a preparation method of the electrolyte. The electrolyte for the high-voltage-resistant aluminumelectrolytic capacitor comprises solute, a main solvent, an auxiliary solvent and an additive, and the solute, the main solvent, the auxiliary solvent and the additive account for 5-30% by mass of thesolute, 40-60% of the main solvent, 10-30% of the auxiliary solvent and 0.3-10% of the additive, wherein the sum of the mass percentages of the components is equal to 100%. Provided is the electrolytic for the electrolytic capacitor, which uses an ammonium salt of a high-molecular polymer represented by formula (I) as a solute, so that the sparking voltage of the capacitor can be obviously improved. The conductivity of the obtained capacitor is better, and the capacity change rate, Tan delta, leakage current and appearance change of the prepared capacitor are less after a high-temperature long-time test, so that it is indicated that the capacitor has the better and large ripple current resistance and can meet the use requirements of the high-voltage-resistant aluminum electrolytic capacitor.

Description

technical field [0001] The invention relates to the technical field of electrolytes for aluminum electrolytic capacitors, in particular to an electrolyte for high-voltage-resistant aluminum electrolytic capacitors and a preparation method thereof. Background technique [0002] Aluminum electrolytic capacitors are widely used in the fields of filtering, bypassing, coupling, resonance, phase shifting and energy storage. With the rapid development of electronic component integration and high-speed processing technology, aluminum electrolytic capacitors with the advantages of "high voltage resistance, high temperature resistance, long life, high frequency ripple current resistance, low impedance and low leakage current" are the current development trend. [0003] In aluminum electrolytic capacitors, the electrolyte has an extremely important influence on the performance of the capacitor such as high temperature life, withstand voltage, impedance and dissipation factor. The ele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/035H01G9/145
CPCH01G9/035H01G9/145
Inventor 薛瑄武赵玉玲
Owner NANTONG RUIDA ELECTRONICS MATERIAL
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