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Electrolyte for super capacitor and super capacitor

A supercapacitor and electrolyte technology, applied in the field of electrochemistry, can solve the problems affecting the performance of capacitors, low solubility, low electrolyte, etc., and achieve the effects of reducing production cost and use cost, simple preparation process, and slow capacity decay

Inactive Publication Date: 2010-09-22
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The prior art has disclosed a variety of inorganic substances as electrolytes in aqueous electrolytes, such as strong acidic substances such as high-concentration sulfuric acid, strong alkaline substances such as potassium hydroxide, and alkali metal sulfates, nitrates, chlorides, etc. However, strong acid and strong alkali electrolytes are corrosive, and their application is limited; the solubility of alkali metal sulfate, nitrate, and chloride salts in water is relatively low, such as the solubility of sodium sulfate in water at 20°C. 19.5g / 100g, the solubility of potassium nitrate in water at 20°C is 31.6g / 100g, which makes the concentration of the electrolyte low, usually 0.25M ~ 1M, which affects the performance of the capacitor

Method used

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  • Electrolyte for super capacitor and super capacitor
  • Electrolyte for super capacitor and super capacitor
  • Electrolyte for super capacitor and super capacitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Dissolve 280.98g of commercially available sodium perchlorate in 1L of deionized water to obtain an electrolyte solution with a concentration of 2M;

[0041] Use the DJS~10C conductivity meter to measure the conductivity of the above electrolyte at room temperature, which is 218mScm -1 ;

[0042] Using a PerkinElmer differential thermal analyzer in the range of 25°C to -70°C, the freezing point of the above electrolytic solution was measured at a cooling rate of 1°C / min, and it was -26.23°C.

Embodiment 2

[0044] Dissolve 421.47g of commercially available sodium perchlorate in 1L of deionized water to obtain an electrolyte solution with a concentration of 3M;

[0045] Use the DJS~10C conductivity meter to measure the conductivity of the above electrolyte at room temperature, which is 273mScm -1 ;

[0046] Using a PerkinElmer differential thermal analyzer in the range of 25°C to -70°C, the freezing point of the above electrolytic solution was measured at a cooling rate of 1°C / min, and it was -30.68°C.

Embodiment 3

[0048] Dissolve 561.96g of commercially available sodium perchlorate in 1L of deionized water to obtain an electrolyte solution with a concentration of 4M;

[0049]Use the DJS~10C conductivity meter to measure the conductivity of the above electrolyte at room temperature, which is 292mScm -1 ;

[0050] Using a PerkinElmer differential thermal analyzer in the range of 25°C to -70°C, the freezing point of the above electrolytic solution was measured at a cooling rate of 1°C / min, and it was -36.33°C.

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Abstract

The invention provides an electrolyte for a super capacitor. In the electrolyte, a solvent is water, and a solute is 2 to 6M sodium perchlorate. The invention also provides the super capacitor, which comprises an anode, a cathode, a diaphragm between the anode and the cathode, and the electrolyte, wherein the electrolyte is 2 to 6M aqueous solution of sodium perchlorate. The aqueous solution of sodium perchlorate with high concentration has high ionic conductivity, the sodium perchlorate is difficult to separate out at a low temperature, and the aqueous solution of sodium perchlorate has low freezing point and can adapt to a low-temperature work environment; and the aqueous solution of sodium perchlorate has wide electrochemical window and good electrochemical properties at the same time. The super capacitor provided by the invention has high ionic conductivity, the capacity is slowly attenuated during charge and discharge, and the energy density and power density are high; and in addition, the electrolyte and the super capacitor provided by the invention have the advantages of simple preparation process, low cost of raw materials, convenient operation and reduction in production cost and using cost.

Description

technical field [0001] The invention relates to the technical field of electrochemistry, in particular to an electrolyte solution for a supercapacitor and the supercapacitor. Background technique [0002] A supercapacitor is an electrochemical element that stores energy through a polarized electrolyte. It has the advantages of high discharge specific power, excellent instantaneous charge and discharge performance, and long cycle life. It can be used as a pollution-free backup power supply for a variety of electrical equipment. It can also form a composite power supply together with the battery to provide power for electric vehicles. [0003] Studies have shown that the performance of supercapacitors is mainly related to the electrolyte used. For example, J.P. Zheng et al. found that the concentration of the electrolyte is closely related to the capacitance, energy density and power density of the capacitor. The higher the concentration of the electrolyte, the more ionic The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/035H01G9/145
CPCY02E60/13
Inventor 王宏宇殷娇齐力
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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