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High-voltage-resistant aqueous electrolyte solution for active carbon supercapacitor and preparation method for high-pressure-resistant aqueous electrolyte solution

A technology of supercapacitor and activated carbon, which is used in the manufacture of hybrid capacitor electrolytes and hybrid/electric double layer capacitors, etc., can solve the problems of high electrolyte price and low cost, and achieve good solution stability, good control, and low corrosion performance. Effect

Active Publication Date: 2016-03-16
HUBEI UNIV OF AUTOMOTIVE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Supercapacitors can be divided into organic system and aqueous solution system supercapacitors according to different electrolytes. The former has a working voltage of 2 to 4V, but the electrolyte is more expensive, and the assembly of the capacitor needs to be carried out in an anhydrous and oxygen-free environment; while the aqueous electrolyte The cost is low, and the capacitor production process is simple, but the working voltage is generally lower than 1.0V

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Use deionized water with a resistivity greater than 18MΩ.cm or distilled water with a conductivity less than 5μS / cm, add a certain amount of analytically pure KHSO at room temperature (20~30°C) 4 , the composition ratio is 82gKHSO per liter of water 4 , stirred, and after each raw material is fully dissolved, a high-voltage-resistant water-based electrolyte for an activated carbon supercapacitor is obtained.

Embodiment 2

[0018] Heat deionized water with a resistivity greater than 18MΩ.cm or distilled water with a conductivity less than 5μS / cm at room temperature to 40°C, and add a certain amount of analytically pure KHSO 4 , the composition ratio is 139gKHSO per liter of water 4 , stir, and keep warm for 10 minutes after each raw material is fully dissolved, then stop heating, and wait for it to cool naturally in the air to obtain a high-voltage resistant water-based electrolyte for activated carbon supercapacitors.

Embodiment 3

[0020] Heat deionized water with a resistivity greater than 18MΩ.cm or distilled water with a conductivity less than 5μS / cm at room temperature to 50°C, add a certain amount of analytically pure KHSO 4 , the composition ratio is 210g KHSO per liter of water 4 , stir, and keep warm for 10 minutes after each raw material is fully dissolved, then stop heating, and wait for it to cool naturally in the air to obtain a high-voltage resistant water-based electrolyte for activated carbon supercapacitors.

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Abstract

The invention provides a high-voltage-resistant aqueous electrolyte solution for an active carbon supercapacitor and a preparation method for the high-voltage-resistant aqueous electrolyte solution, so that working voltage and energy density of the supercapacitor can be increased. The technical scheme is as follows: the preparation method comprises: (1) selecting a solvent and solutes, wherein the solvent adopts de-ionized water or distilled water, the solutes adopt analytically pure KHSO4 and LiCl, a mass ratio of the water to KHSO4 is 1,000 : (28-210), and a mass ratio of the water to LiCl is 1,000 : (0-20); and (2) preparing the electrolyte solution: pouring accurately weighed KHSO4 into the de-ionized water or the distilled water with the temperature of 20-50 DEG C, stirring to ensure that KHSO4 is completely dissolved, and adding weighed LiCl to perform dissolution so as to obtain the high-voltage-resistant aqueous electrolyte solution for the active carbon supercapacitor. The electrolyte solution prepared with the method has good use performance, good solution stability, high voltage resistance, low current collector corrosion performance and good low-temperature conductivity, thereby having wide application prospects.

Description

technical field [0001] The invention belongs to the technical field of electrolyte preparation, and in particular relates to a high-voltage water-based electrolyte for supercapacitors and a preparation method thereof. Background technique [0002] Supercapacitors, also known as electrochemical capacitors, are a new type of energy storage components that can be charged and discharged quickly and have a long service life. They have broad application prospects in new energy vehicles, information technology, aerospace and national defense. Supercapacitors can be divided into organic system and aqueous solution system supercapacitors according to different electrolytes. The former has a working voltage of 2 to 4V, but the electrolyte is more expensive, and the assembly of the capacitor needs to be carried out in an anhydrous and oxygen-free environment; while the aqueous electrolyte The cost is low, and the production process of the capacitor is simple, but the working voltage is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/60H01G11/62H01G11/84
CPCY02E60/13H01G11/60H01G11/62H01G11/84
Inventor 沈培智曾大新张军汤乐新
Owner HUBEI UNIV OF AUTOMOTIVE TECH
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