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Water-based electrolyte of super capacitor

A water-based electrolyte and supercapacitor technology, applied in the direction of hybrid capacitor electrolyte, etc., can solve the problems of poor low-temperature performance of supercapacitors, and achieve the effects of improving low-temperature performance and working voltage, increasing working voltage, and ensuring conductivity

Active Publication Date: 2014-05-21
DONGFENG COMML VEHICLE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the problem of poor low-temperature performance of supercapacitors in the prior art, and to provide an aqueous electrolyte for supercapacitors that can effectively improve the low-temperature performance of supercapacitors

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032]A kind of supercapacitor aqueous electrolyte, the raw material composition of this electrolyte comprises deionized water, neutral inorganic electrolyte salt, low-temperature additive, withstand voltage additive, the volume of described low-temperature additive accounts for 5% of total volume of electrolyte, and described withstand The volume of the voltage additive accounts for 0.1% of the total volume of the electrolyte, and the concentration of the neutral inorganic electrolyte salt in the electrolyte is 0.5mol / L, wherein the low-temperature additive is ethylene glycol, and the withstand voltage additive is four Methylpropylenediamine D-13, the neutral inorganic electrolyte salt is Li 2 SO 4 ·H 2 O;

[0033] During preparation, the neutral inorganic electrolyte salt is first dissolved in deionized water to obtain an electrolyte salt solution, and then a low-temperature additive and a withstand voltage additive are added to the electrolyte salt solution and mixed unif...

Embodiment 2

[0037] The steps are the same as in Example 1, except that the volume of the low-temperature additive accounts for 25% of the total volume of the electrolyte, the volume of the voltage-resistant additive accounts for 0.2% of the total volume of the electrolyte, and the neutral inorganic electrolyte salt is The concentration in the liquid is 1mol / L.

[0038] The supercapacitor prepared by using the supercapacitor aqueous electrolyte has a freezing point of minus 13°C, a specific capacity of 45.3F / g, and an energy density of 22.9 Wh / kg.

Embodiment 3

[0040] The steps are the same as in Example 1, except that the volume of the low-temperature additive accounts for 30% of the total volume of the electrolyte, the volume of the voltage-resistant additive accounts for 0.8% of the total volume of the electrolyte, and the neutral inorganic electrolyte salt is The concentration in the liquid is 1mol / L.

[0041] The supercapacitor prepared by using the supercapacitor aqueous electrolyte has a freezing point of minus 14.5°C, a specific capacity of 47.2F / g, and an energy density of 24.5 Wh / kg.

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Abstract

The invention provides a water-based electrolyte of a super capacitor. The raw materials of the water-based electrolyte include deionized water, a neutral inorganic electrolyte salt, a low-temperature additive and a voltage-resistant additive, wherein the low-temperature additive is an organic alcohol type compound and the volume of the low-temperature additive accounts for 5%-40% of the total volume of the electrolyte, the voltage-resistant additive is at least one of epoxy chloropropane cross-linked intermediate, dichlorobutane cross-linked intermediate, tetramethyldiaminopropane D-13, vanillic aldehyde, benzaldehyde and polyoxyethylene aliphatic alcohol ether, the neutral inorganic electrolyte salt is at least one of Li2SO4.H2O, NH4Cl, NaCl, KCl, (NH4)2SO4, NH4NO3, NaNO3 and KNO3, and the concentration of the neutral inorganic electrolyte salt in the electrolyte is 0.5-3mol / L. The water-based electrolyte of the super capacitor is capable of improving the low temperature property and the working voltage of the super capacitor and advantageous for improving the mass specific capacity of the super capacitor.

Description

technical field [0001] The invention belongs to the field of electrochemical capacitors, and in particular relates to an aqueous electrolyte solution for a supercapacitor, which is suitable for improving the low-temperature performance and working voltage of the supercapacitor while ensuring the conductivity of the electrolyte solution. Background technique [0002] Electrolyte is the key material of supercapacitors, and its performance has an important impact on the internal resistance, life, and rate performance of supercapacitors. The electrolyte of the supercapacitor is divided into acid electrolyte, alkaline electrolyte and neutral electrolyte. The acid electrolyte has great corrosion on the electrode and the current collector, and the alkaline electrolyte has alkali climbing phenomenon, which makes the sealing difficult. At the same time , due to the high ionic activity of acidic and alkaline supercapacitors, the electrolyte is easily decomposed during charging and dis...

Claims

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Application Information

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IPC IPC(8): H01G11/64H01G11/62
CPCY02E60/13
Inventor 陈果刘立炳
Owner DONGFENG COMML VEHICLE CO LTD
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