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Aqueous electrolyte and application thereof

An aqueous electrolyte and electrolyte technology, applied in the field of electrochemical energy storage, can solve the problems of poor interface compatibility, poor low temperature performance, high cost, etc., and achieve the effect of improving electrochemical performance and application range

Active Publication Date: 2019-07-26
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are still problems such as high cost, poor interface compatibility, high pressure resistance, and poor low temperature performance.

Method used

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  • Aqueous electrolyte and application thereof
  • Aqueous electrolyte and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] The specific composition of the aqueous electrolyte in this example is solvent water, the functional solute of restricted water molecules is sucrose, and the electrolyte is sodium nitrate. The preparation method is as follows: Weigh each group according to the weight ratio of water / sucrose / sodium nitrate = 1 / 2 / 0.1 And dissolve in water to obtain the aqueous electrolyte of this example. Among them, sucrose accounts for 64.5% of the mass fraction of the electrolyte. A three-electrode linear voltammetry was used to test the electrochemical window of the aqueous electrolyte prepared in this example. The saturated calomel electrode was used as the reference electrode, and the platinum disk electrode was used as the counter electrode and the working electrode. The electrochemical stability window of the aqueous electrolyte reaches 2.6V, and it can work stably at -40°C.

[0035] The aqueous electrolyte of this example is used in an aqueous sodium ion battery, and the positive el...

Embodiment 2

[0037] The specific composition of the aqueous electrolyte in this example is solvent water, the functional solute of restricted water molecules is sucrose, and the electrolyte is potassium nitrate. The preparation method is as follows: Weigh each group according to the weight ratio of water / sucrose / potassium nitrate = 1 / 2 / 0.1 And dissolve in water to obtain the aqueous electrolyte of this example. Among them, sucrose accounts for 64.5% of the mass fraction of the electrolyte. A three-electrode linear voltammetry was used to test the electrochemical window of the aqueous electrolyte prepared in this example. The saturated calomel electrode was used as the reference electrode, and the platinum disk electrode was used as the counter electrode and the working electrode. The electrochemical stability window of the aqueous electrolyte reaches 2.7V, and it can work stably at -40°C.

[0038] The aqueous electrolyte of this example is used in an aqueous potassium ion battery, and the po...

Embodiment 3

[0040] The specific composition of the aqueous electrolyte in this example is solvent water, the functional solute of restricted water molecules is sucrose, and the electrolyte is zinc sulfate. The preparation method is as follows: Weigh each group according to the weight ratio of water / sucrose / zinc sulfate = 1 / 2 / 0.1 And dissolve in water to obtain the aqueous electrolyte of this example. Among them, sucrose accounts for 64.5% of the mass fraction of the electrolyte. A three-electrode linear voltammetry was used to test the electrochemical window of the aqueous electrolyte prepared in this example. The saturated calomel electrode was used as the reference electrode, and the platinum disk electrode was used as the counter electrode and the working electrode. The electrochemical stability window of the aqueous electrolyte reaches 2.8V, and it can work stably at -40°C.

[0041] The water-based electrolyte of this example is used in a water-based zinc-ion battery. The positive elect...

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Abstract

The invention discloses an aqueous electrolyte. The aqueous electrolyte comprises a domain-limiting water molecule functional solute, water and an electrolyte, wherein the water-limiting water molecule functional solute is selected from one or more of sucrose, maltose and fructose, and the mass percentage of the domain-limiting water molecule functional solute in the aqueous electrolyte is 50% orabove; and the electrolyte is alkali metal and / or alkaline earth metal, and / or a soluble salt or a soluble hydroxide of zinc. The aqueous electrolyte is provided with a high-voltage window and a wideworking temperature range, and is suitable for a high-voltage low-temperature-resistant aqueous hybrid supercapacitor. The invention also discloses an application of the aqueous electrolyte and an electrochemical energy storage device comprising the aqueous electrolyte.

Description

Technical field [0001] The invention relates to the field of electrochemical energy storage. More specifically, it relates to an aqueous electrolyte and its application. Background technique [0002] Supercapacitors are an electrochemical energy storage device between traditional capacitors and secondary batteries. They are widely used in smart meters, new energy vehicles, military high-power power supplies and other fields. Supercapacitors have ultra-high power density, which is more than tens of times that of secondary batteries; they have an ultra-long life, reaching a cycle life of more than 500,000 cycles and a calendar life of more than ten years; however, supercapacitors also have higher energy density Low shortcomings restrict its development and application. In order to improve the energy storage density of supercapacitors, researchers usually work from two aspects: developing electrode materials with high specific capacitance and increasing the working voltage of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/62H01G11/64H01M10/36
CPCH01G11/62H01G11/64H01M10/36Y02E60/10Y02E60/13
Inventor 薛面起毕海波
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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