Electrolyte of aluminum electrolytic capacitor and preparation method of solute thereof

A technology for aluminum electrolytic capacitors and electrolytes, which is applied in the field of preparation of electrolytes and their solutes, can solve the problems of poor low-temperature performance of electrolytic capacitors, small size, no more than 6% at room temperature, and affect the life of capacitors, etc., to achieve good low-temperature performance, Effect of high flash voltage and high flash voltage

Inactive Publication Date: 2009-11-04
SHENZHEN CAPCHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Later, azelaic acid, sebacic acid, dodecanedioic acid and its ammonium salts were used as the main solute of the electrolyte, and the above inorganic salts were also used as the solute with organic acid salts. Such electrolytes have a flashover voltage bias. The problem of low temperature, and poor thermal stability at high temperature, the conductance drops greatly after long-term high temperature
Among them, boric acid or its salt will produce water with ethylene glycol at high temperature, which will affect the life of the capacitor, while ammonium sebacate, ammonium dodecanoic acid, etc. have low solubility in ethylene glycol, and do not exceed 6% at room temperature. , so that the low temperature performance of the electrolytic capacitor is poor

Method used

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  • Electrolyte of aluminum electrolytic capacitor and preparation method of solute thereof
  • Electrolyte of aluminum electrolytic capacitor and preparation method of solute thereof
  • Electrolyte of aluminum electrolytic capacitor and preparation method of solute thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Get 155g (i.e. 0.72mol) of butyldiethylmalonate, content is 80% NaH 22g, 2,2'-dichloroethyl ether 50g (i.e. 0.35mol), N-methylpyrrolidone 200g, after mixing, in React at 130°C for 50 hours, and neutralize to neutral after the reaction is complete. Remove sodium chloride by filtration, distill under reduced pressure, saponify, acidify, wash, and dry to obtain 52 g of acid, yield 49%;

Embodiment 2

[0052] Get 166g (ie 0.77mol) of dimethyl hexylmalonate, 25g of NaH with a content of 80%, 50g (ie 0.35mol) of 2,2'-dichloroethyl ether, and 200g of N-methylpyrrolidone. ℃ for 50 hours, the reaction is complete and neutralized to neutral. Remove sodium chloride by filtration, distill under reduced pressure, saponify, acidify, wash, and dry to obtain 56 g of acid, yield 45%;

[0053] Gained acid and ammonia are made into ammonium salt, and ethylene glycol solution is made into as electrolyte. In order to illustrate its beneficial effect and traditional ammonium sebacate ethylene glycol electrolyte solution for comparative experiments, its performance comparison is as follows:

[0054] Table I

[0055]

Embodiment 3

[0057] The acid obtained in Example 1 is made into ammonium salt and made into 500g of 5% ethylene glycol solution, put into a 1000ml stainless steel bottle, add 0.1% ammonium hypophosphite, 0.4% p-nitrobenzyl alcohol, seal, and keep the temperature at 105°C Test conductivity after 2000h;

[0058] As a comparison sample, put 500g of 5% ammonium sebacate glycol solution into a 1000ml stainless steel bottle, then add 0.1% ammonium hypophosphite and 0.4% p-nitrobenzyl alcohol, seal it, and test the conductivity at a constant temperature of 105°C for 2000h Rate;

[0059] Table 2: Results comparison table

[0060]

[0061] Combining the data in Table 1 and Table 2 for analysis:

[0062] The acid ammonium salt 5% ethylene glycol solution that embodiment 1 makes is based on making electrolyte, and its flash fire voltage is 36V higher than 5% ammonium sebacate ethylene glycol solution, through 105 ℃, after 2000h constant temperature, conductivity Decline slowly (decrease 27%), a...

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Abstract

The invention relates to electrolyte of a medium-high voltage aluminum electrolytic capacitor and a preparation method of solute thereof. In order to solve the problems of low sparking voltage, poor thermal stability and bad solubility in the traditional electrolyte, the invention provides the electrolyte containing dicarboxylic acid containing ether group or salt thereof as a solute and a single solvent or a mixed solvent containing more of alcohols, alcohols and ethers, amides, sulfones, sulfoxides and esters, wherein the mass percentage of the solute is 0.1-30 percent. Additionally, the dicarboxylic acid containing ether group is prepared by reacting reactants of X1R1OR2X2(M) and (formula is shown upper right) (N) with alkali, filtering, saponifying, decarboxylating and washing. Ammonium salt is produced if required by dicarboxylic acid containing ether group reacting with ammonia or amine. The electrolyte prepared with acid or salt thereof in the invention has higher sparking voltage and better thermal stability. Furthermore, the solute in the invention has better solubility in ethylene glycol.

Description

technical field [0001] The invention relates to a method for preparing an electrolyte solution of an electrolytic capacitor and a solute thereof, in particular to a method for preparing an electrolyte solution and a solute thereof of a medium-high voltage aluminum electrolytic capacitor. Background technique [0002] The known electrolytes of medium and high voltage electrolytic capacitors use ethylene glycol as the solvent and inorganic compounds such as boric acid or ammonium pentaborate as the main solute. Such electrolytes have the problem of low electrical conductivity. Later, azelaic acid, sebacic acid, dodecanedioic acid and its ammonium salts were used as the main solute of the electrolyte, and the above inorganic salts were also used as the solute with organic acid salts. Such electrolytes have a flashover voltage bias. Low problem, and the high temperature thermal stability is poor, and its conductance drops greatly after long-term high temperature. Among them, bo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/022H01G9/035
Inventor 郑仲天何天虔陈长春
Owner SHENZHEN CAPCHEM TECH
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