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Electrolyte for supercapacitor

A supercapacitor and electrolyte technology, applied in the direction of hybrid capacitor electrolytes, etc., can solve the problems of capacitor bulging, reduce capacitor performance, reduce electrolyte salt solubility, etc., to achieve stable operation, improve melting point, and widen the effect of the working temperature range.

Inactive Publication Date: 2017-12-22
HUNAN CMAX NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, linear carboxylic acid esters generally have a low boiling point (<100°C). For example, the boiling point of methyl formate is only 39°C, which leads to extremely poor high-temperature performance of supercapacitors. Working in an environment of 50°C will cause the capacitor to swell due to solvent volatilization
In addition, the dielectric constant of linear carboxylate is very small (<7), adding a large amount will reduce the solubility of the electrolyte salt, thereby reducing the performance of the capacitor

Method used

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  • Electrolyte for supercapacitor
  • Electrolyte for supercapacitor
  • Electrolyte for supercapacitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Add 1,2-dinitroethane (1,2-NE, accounting for 10% of the total mass of the solvent) to the acetonitrile (AN) solvent to make a mixed solvent, and then add 1.0M monomethyltriethyl to the mixed solvent ammonium tetrafluoroborate (MeEt 3 NBF 4 ), prepared to 1.0MMeEt 3 NBF 4 / AN+1, 2-NE supercapacitor electrolyte, test its conductivity with a conductivity meter, and with 1.0MMeEt 3 NBF 4 / AN electrolyte conductivity for comparison, the results are shown in Table 1:

[0017] Table 1 Conductivity of electrolytes for supercapacitors at different temperatures

[0018]

Embodiment 2

[0020] Add 1-nitropropane (1-NP, accounting for 0.1% of the total mass of the solvent) to a propylene carbonate (PC) solvent to make a mixed solvent, then add 1.0M monomethyltriethyltetrafluoroboric acid to the mixed solvent Ammonium (MeEt 3 NBF 4 ), prepared to 1.0MMeEt 3 NBF 4 / (PC+1-NP) Electrolyte for supercapacitor, test its conductivity with a conductivity meter, and compare with 1.0MMeEt 3 NBF 4 / AN electrolyte conductivity for comparison, the results are shown in Table 2:

[0021] Table 2 Conductivity of electrolytes for supercapacitors at different temperatures

[0022]

Embodiment 3

[0024] Add nitroethane (NE, accounting for 10% of the total mass of the solvent) to acetonitrile (AN) + propionitrile (PN) = 1:1 solvent to make a mixed solvent, and then add 1.5M spirotetrafluoro Quaternary ammonium borate (SBPBF 4 ), prepared to 1.5M SBPBF 4 / (AN+PN+NE) Electrolyte for supercapacitor, test its conductivity with a conductivity meter, and compare with 1.0M MeEt 3 NBF 4 / AN electrolyte conductivity for comparison, the results are shown in Table 3:

[0025] Table 3 Conductivity of electrolytes for supercapacitors at different temperatures

[0026]

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Abstract

The invention discloses an electrolyte solution for a supercapacitor. The electrolyte solution is composed of an electrolyte salt and a solvent. The solvent is composed of at least one of a nitrile solvent, an ester solvent and a sulfone solvent and an alkane compound containing a nitro group. Composition; the electrolyte can improve the physical and chemical properties of the electrolyte such as melting point, boiling point and dielectric constant by adding nitro-containing alkane compounds, effectively improving the high and low temperature stability of the electrolyte, so that the supercapacitor can be used without affecting the electrochemistry. Under the premise of performance, it can work stably at -60℃~80℃.

Description

technical field [0001] The invention relates to an electrolyte solution for a supercapacitor, belonging to the technical field of supercapacitor electrolytes. Background technique [0002] Electrochemical double layer capacitors, also known as super capacitors, are new energy storage devices between secondary batteries and traditional electrostatic capacitors. They have higher energy density than traditional electrostatic capacitors and more energy than secondary batteries. Large power density, which has the advantages of high power density, long cycle life, wide operating temperature range, good cycle stability, maintenance-free, and environmental friendliness. It has been used in many fields, such as rail transit, wind power, and hybrid power Vehicles, backup power supplies for electronic devices, etc. have shown broad application prospects. [0003] The current supercapacitor organic system electrolyte is mainly composed of organic solvents and organic salts. Solvents i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/60
CPCY02E60/13
Inventor 关翔赖延清洪波
Owner HUNAN CMAX NEW ENERGY TECH