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Aqueous electrolyte and preparation method thereof, supercapacitor, secondary battery and electric device

A water-based electrolyte and supercapacitor technology, applied in the field of electrolyte, can solve the problems of low voltage window and achieve the effects of low production cost, simple operation and stable process

Active Publication Date: 2022-04-22
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The first object of the present invention is to provide an aqueous electrolyte to alleviate the technical problem of low voltage window existing in the existing aqueous electrolyte

Method used

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  • Aqueous electrolyte and preparation method thereof, supercapacitor, secondary battery and electric device
  • Aqueous electrolyte and preparation method thereof, supercapacitor, secondary battery and electric device
  • Aqueous electrolyte and preparation method thereof, supercapacitor, secondary battery and electric device

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Embodiment approach

[0069] As a preferred embodiment of the present invention, the molar concentration of the heteropoly acid salt in the aqueous electrolyte is 0.08-0.90 mol / L;

[0070] The molar concentration of sodium sulfate in the aqueous electrolyte is 0.08-0.70mol / L;

[0071] The volume fraction of the low-carbon alcohol in the aqueous electrolyte is 5.5-8.5%.

[0072] By limiting the concentration of each component in the water-based electrolyte, the water-based electrolyte can obtain a wider voltage window.

[0073] As an optional embodiment of the present invention, the low-carbon alcohol is a C1-C4 alcohol;

[0074] Preferably, the low-carbon alcohol includes any one or a combination of at least two of methanol, ethanol or propanol, preferably ethanol.

[0075] By limiting the specific types of low-carbon alcohols, while having good solubility in the aqueous electrolyte, the voltage window of the aqueous electrolyte can be further expanded.

[0076] According to a second aspect of t...

Embodiment 1

[0088] An embodiment of the present invention provides an aqueous electrolyte, comprising the following components:

[0089] Heteropoly acid salts, sodium sulfate, pH regulator nitric acid, ethanol and water;

[0090] Among them, the heteropolyacid salt is Na2 h 8 [MnV 13 o 38 ]·12H 2 O, the molar concentration of the heteropoly acid salt in the aqueous electrolyte is 0.1mol / L, the molar concentration of sodium sulfate in the aqueous electrolyte is 0.2mol / L, and the volume fraction of ethanol in the aqueous electrolyte is 4.0%. Add Nitric acid adjusts the pH of the aqueous electrolyte to 3.0.

Embodiment 2

[0092] An embodiment of the present invention provides an aqueous electrolyte, comprising the following components:

[0093] Heteropoly acid salts, sodium sulfate, pH regulator nitric acid, ethanol and water;

[0094] Among them, the heteropolyacid salt is Na 2 h 8 [MnV 13 o 38 ]·12H 2 O, the molar concentration of the heteropoly acid salt in the aqueous electrolyte is 0.3mol / L, the molar concentration of sodium sulfate in the aqueous electrolyte is 0.1mol / L, and the volume fraction of ethanol in the aqueous electrolyte is 5.0%. Add Nitric acid adjusts the pH of the aqueous electrolyte to 4.0.

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Abstract

The invention provides an aqueous electrolyte, a preparation method thereof, a supercapacitor, a secondary battery and an electric device, and relates to the technical field of electrolytes. The water-based electrolyte includes heteropolyacid salts, sodium sulfate, low-carbon alcohols and water, and uses the relatively wide voltage window of sodium sulfate itself to add heteropolyacids and low-carbon alcohols that are easily adsorbed on electrode active materials. The carbon alcohol can further prevent water molecules from contacting the electrode active material, so that the aqueous electrolyte has a wider voltage window. The invention also provides a preparation method of the water-based electrolyte. The preparation method has simple operation, stable process and is suitable for industrial scale production. The present invention also provides a supercapacitor or a secondary battery comprising the above-mentioned aqueous electrolyte, in view of the fact that the above-mentioned aqueous electrolyte has a wider voltage window, so that the supercapacitor or secondary battery comprising it has a higher energy density, electrochemical Better performance.

Description

technical field [0001] The invention relates to the technical field of electrolytes, in particular to an aqueous electrolyte and a preparation method thereof, a supercapacitor, a secondary battery and an electric device. Background technique [0002] Electrolyte is the medium used in chemical batteries, electrolytic capacitors, etc. It provides ions for the normal operation of batteries or capacitors, and ensures that the chemical reactions that occur during work are reversible. Electrolyte includes two categories, aqueous electrolyte and non-aqueous electrolyte. Non-aqueous electrolytes are mainly anhydrous organic solvents, which have a high electrochemical window, but organic electrolytes are flammable, toxic, and strict operating conditions limit their further applications. Therefore, water-based electrolytes have gradually attracted people's attention due to their safety, easy operation, and environmental protection. [0003] However, since the theoretical decompositi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/60H01G11/62H01G11/64H01G11/84H01M10/36
CPCH01G11/60H01G11/62H01G11/64H01G11/84H01M10/36Y02E60/13Y02E60/10
Inventor 胡涵晁会霞卢玉坤潘圆圆牛国瑞
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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