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A kind of ionic liquid electrolyte for ultra-high stability aluminum electrolytic capacitor and preparation method thereof

An aluminum electrolytic capacitor, ionic liquid technology, applied in electrolytic capacitors, liquid electrolytic capacitors, capacitors and other directions, can solve the problems of low flash voltage, hinder the application of ionic liquid, poor flash stability, etc., and achieve wide temperature range and broad industrial application. Foreground, stable performance

Active Publication Date: 2021-09-07
SHANGHAI JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, when the commonly used ionic liquid is used as the electrolyte of aluminum electrolytic capacitors, there are problems such as low flashover voltage and poor flashover stability, which seriously hinder the application of ionic liquids in the electrolyte of aluminum electrolytic capacitors.

Method used

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  • A kind of ionic liquid electrolyte for ultra-high stability aluminum electrolytic capacitor and preparation method thereof
  • A kind of ionic liquid electrolyte for ultra-high stability aluminum electrolytic capacitor and preparation method thereof
  • A kind of ionic liquid electrolyte for ultra-high stability aluminum electrolytic capacitor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Mix 1-methyl-3-ethylimidazolium methyl sulfate and ethylene glycol at a mass ratio of 1:1 and add it to a 100ml round-bottomed three-neck flask, and fix it in a constant temperature oil whose temperature is adjusted to 150°C In a bath, stir at constant temperature for 1 hour to prepare a basic ionic liquid electrolyte.

[0040] Cyclohexanone and ethyl acrylate are mixed according to the molar ratio of 1:2 and added to a 250ml round-bottomed three-neck flask, adding solvent tetrahydrofuran with a volume ratio of 2:1 to the reactant, and then adding a volume ratio of 1:1 to the reactant 20 catalyst triethylamine, reflux at 80°C for 4h. Then add tert-butyl hydroperoxide with a volume ratio of 1:50 to the reactant and stir at 80° C. for 2 h to obtain a solute in a high oxidation state.

[0041] Mix the highly oxidized solute and the ionic liquid electrolyte at a mass ratio of 3:10 and add it to a 100ml round-bottomed three-necked flask, fix it in a constant temperature oil...

Embodiment 2

[0045] Mix 1-methyl-3-decylimidazolium methyl sulfate and ethylene glycol at a ratio of 1:2 by mass and add it to a 100ml round-bottomed three-neck flask, and fix it in a constant temperature water bath whose temperature is adjusted to 120°C In the pot, stir at constant temperature for 3 hours to prepare the basic ionic liquid electrolyte.

[0046] Cyclohexanone and isopropyl acrylate are mixed according to the molar ratio of 1:1 and added to a 250ml round-bottomed three-necked flask, adding solvent tetrahydrofuran with a volume ratio of 1:1 to the reactant, and then adding a volume ratio of 1:1 to the reactant. 1:50 catalyst triethylamine, reflux at 50°C for 4h. Then add tert-butyl hydroperoxide with a volume ratio of 1:20 to the reactant and stir at 80° C. for 8 hours to obtain a solute in a high oxidation state.

[0047] Mix the highly oxidized solute and the ionic liquid electrolyte at a mass ratio of 1:10 and add it to a 100ml round-bottomed three-neck flask, fix it in a...

Embodiment 3

[0050] Mix 1-decyl-3-methylimidazolium methyl sulfate and ethylene glycol at a mass percentage of 2:1 and add it to a 100ml round-bottomed three-neck flask, and fix it in a constant temperature water bath whose temperature is adjusted to 80°C In the pot, stir at constant temperature for 2 hours to prepare the basic ionic liquid electrolyte.

[0051] Cyclohexanone and ethyl acrylate are mixed according to the molar ratio of 1:2 and added to a 250ml round-bottomed three-neck flask, adding solvent tetrahydrofuran with a volume ratio of 2:1 to the reactant, and then adding a volume ratio of 1:1 to the reactant 10 catalyst triethylamine, reflux at 150°C for 10h. Then add tert-butyl hydroperoxide with a volume ratio of 1:100 to the reactant and stir at 100° C. for 10 h to obtain a solute in a high oxidation state.

[0052] Mix the highly oxidized solute and the ionic liquid electrolyte at a mass ratio of 2:10 and add it to a 100ml round-bottomed three-necked flask, fix it in a cons...

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Abstract

The invention relates to an ionic liquid electrolyte for an ultra-high stability aluminum electrolytic capacitor and a preparation method thereof, comprising a basic ionic liquid prepared from an ionic liquid imidazolium sulfate salt and ethylene glycol with a mass ratio of 1:2-2:1 Electrolyte, and adding different concentrations of high-oxidation state solutes to it to make it stable in a more high-frequency and high-pressure environment, and prepare a series of ultra-high stability ionic liquid electrolytes suitable for different voltage ranges. Compared with the prior art, the ionic liquid electrolyte proposed by the present invention is far superior to the currently commercially available electrolyte in terms of its high and low temperature stability, pH, conductivity, flash voltage, and flash stability. The cost is low, the applicable voltage gradient is easy to control, and has high industrial application value.

Description

technical field [0001] The invention relates to the technical field of electronic chemical industry, in particular to an ionic liquid electrolyte for an ultra-high stability aluminum electrolytic capacitor and a preparation method thereof. Background technique [0002] Aluminum electrolytic capacitors are indispensable electronic components. In recent years, the unprecedented development of the electric vehicle industry, 5G communication base stations, military, aerospace and other fields has led to a surge in the market demand for high-quality and low-cost aluminum electrolytic capacitors. The production of high-quality and low-cost aluminum electrolytic capacitors has become a major opportunity for Chinese national enterprises to rank among the global leaders in the field of high-end electronic components. Solving the problems of large leakage current and poor thermal stability of aluminum electrolytic capacitors has become a hot research direction at present. [0003] Co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G9/035H01G9/145
CPCH01G9/035H01G9/145
Inventor 原鲜霞闻一婵薛瑄武
Owner SHANGHAI JIAOTONG UNIV
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