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Aqueous supercapacitor

A supercapacitor, water-based technology, used in capacitors, electrolytic capacitors, liquid electrolytic capacitors, etc., can solve the problems of electrolyte solution corrosion, low energy density, and low electrolyte solution corrosion, and achieve the effect of wide voltage window and high energy density.

Inactive Publication Date: 2014-01-22
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of the existing water-based supercapacitors such as low energy density and corrosion of the electrode sheets by the electrolyte solution, and provide a water-based supercapacitor with high energy density and low corrosion of the electrolyte solution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Fabrication of coin supercapacitors. Get the gac of 70 mass parts, the polytetrafluoroethylene (60% mass concentration water emulsion) of 10 mass parts and the acetylene black of 20 mass parts, in the Virahol of 300 mass parts, mix and disperse and make slurry evenly, After rolling into a skin, press it on a stainless steel net, punch it into a positive electrode piece and a negative electrode piece with a diameter of 13 mm after drying, put it into the lower case of the supercapacitor in the order of the positive electrode piece-polypropylene diaphragm-negative electrode piece-gasket, add dropwise 2 mol / L lithium sulfate aqueous solution, the amount to be added dropwise should not overflow. After standing in vacuum for 10 minutes, put the sealing gasket and the upper shell of the supercapacitor and seal it, and assemble it into a button-type supercapacitor.

Embodiment 2

[0017] Fabrication of wound supercapacitors. Take 5 parts by mass of sodium carboxymethylcellulose and dissolve it in 300 parts by mass of deionized water, then add 2 parts by mass of styrene-butadiene rubber and mix evenly, then add 13 parts by mass of conductive carbon black and 80 parts by mass of activated carbon , mixed evenly to make a slurry. Coat the slurry on the aluminum foil, and make positive and negative electrodes through drying, rolling, slitting and other processes. The order of the separators is wound together into a cell, and the cell is loaded into the supercapacitor casing, and then a mixed aqueous solution containing 0.5 mol / L lithium sulfate, 0.2 mol / L potassium nitrate and 0.2 mol / L sodium sulfate is added, dripping It is advisable to add the amount not to overflow, and after standing in vacuum for 10 minutes, it is sealed to make a cylindrical supercapacitor.

Embodiment 3

[0019] Get the gac of 70 mass parts, the polytetrafluoroethylene (60% mass concentration water emulsion) of 10 mass parts and the acetylene black of 20 mass parts, in the Virahol of 300 mass parts, mix and disperse and make slurry evenly, After rolling into a skin, press it on a stainless steel net, punch it into a positive electrode piece and a negative electrode piece with a diameter of 13 mm after drying, put it into the lower case of the supercapacitor in the order of the positive electrode piece-polypropylene diaphragm-negative electrode piece-gasket, add dropwise A mixed aqueous solution containing 1mol / L lithium sulfate and 0.2mol / L potassium nitrate, the amount to be added dropwise should not overflow. After standing in vacuum for 10 minutes, put the sealing gasket and the upper shell of the supercapacitor and seal it, and assemble it into a buckle type supercapacitor.

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PUM

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Abstract

An aqueous supercapacitor comprises electrolyte liquor, a positive plate, a negative node and a diaphragm. The electrolyte liquor is used for realizing ionic conduction, the positive plate and the negative plate are arranged at intervals and are adsorbed with the electrolyte liquor, the diaphragm is disposed between the positive plate and the negative plate, each of the positive plate and the negative plate consists of active substances, conductive additive, binder and a current collector, the active substances are carbon materials, and the electrolyte liquor is neutral aqueous liquor of alkali metal. The aqueous supercapacitor has the advantages that energy density is high, and corrosiveness of the electrolyte liquor is low.

Description

technical field [0001] The invention relates to a supercapacitor. Background technique [0002] Supercapacitors, also known as electrochemical capacitors, are a new type of energy storage element. They have the advantages of high power density of conventional capacitors and high energy density of chemical power sources. They can be charged and discharged quickly and have a long service life. All have broad application prospects. [0003] According to different electrolyte solutions, supercapacitors can be divided into three types: organic system, ionic liquid system and aqueous solution system. The former two have a larger electrochemical window and a working voltage of up to 2.7V. However, the price of the electrolyte solution is relatively expensive, and it needs In a dry production environment, the process cost is relatively high. Carbon-based materials are the most widely used active materials for supercapacitors, and their aqueous electrolyte solutions generally use H...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G9/035H01G9/042H01G9/145
CPCY02E60/13
Inventor 孙现众马衍伟张熊刘水平闫新育
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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