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Supermolecule-based aqueous alkaline electrolyte with ultra-wide working temperature range and application thereof

An ultra-wide working temperature, electrolyte technology, applied in the field of electrochemical energy storage, can solve the problems of limited application, damage, large difference in rate performance, etc., and achieve the effects of simple preparation and storage conditions, easy implementation, and simple composition of components

Active Publication Date: 2021-09-21
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, a simple aqueous alkaline electrolyte with a high freezing point consisting only of inorganic bases (electrolytes) dissolved in water (solvents) is difficult to meet the needs of practical applications, especially difficult to maintain normal work in low temperature winter or night, and at different operating temperatures However, there are shortcomings such as large differences in the transport performance of electrolyte ions, which are mainly reflected in the large changes in charge storage capacity and large differences in rate performance of electrochemical energy storage devices such as aqueous alkaline supercapacitors and batteries. When there is a large temperature change, the energy storage performance of these energy storage devices may become unstable, or even fail to work or be damaged, which greatly limits their use in all-day, all-season, and extreme temperature fields (such as aerospace and polar expeditions). etc.)

Method used

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  • Supermolecule-based aqueous alkaline electrolyte with ultra-wide working temperature range and application thereof
  • Supermolecule-based aqueous alkaline electrolyte with ultra-wide working temperature range and application thereof
  • Supermolecule-based aqueous alkaline electrolyte with ultra-wide working temperature range and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Example 1: Prepare the electrolyte and match it with activated carbon as the electrode material to assemble a symmetrical supercapacitor. Wherein, the solute of the electrolyte is 6 mol / L potassium hydroxide, and the solvent is a supramolecular solvent constructed of deionized water and dimethyl sulfoxide with a molar ratio of 10:1. The working voltage of the device is 0~1V, and it has a very wide working temperature range, and, under the conditions of charging voltage window of 0.8V and charging and discharging current density of 1A / g, it has a relatively stable temperature in the working temperature range. Capacitance retention rate, among them, the capacitance retention rate (relative to 25°C) in the temperature range of -40°C to 80°C is as follows: figure 1 As shown, it can be seen that the capacitance change rate in the temperature range of -40°C to 50°C is less than 10%.

Embodiment 2

[0025] Example 2: Prepare the electrolyte, match with activated carbon as the electrode material, and assemble the symmetrical supercapacitor. Wherein, the solute of the electrolyte is a mixture of 4.5 mol / L sodium hydroxide and potassium hydroxide, and the solvent is a supramolecular solvent constructed of deionized water and dimethyl sulfoxide with a molar ratio of 7:1. The working voltage of the device is 0~1V, and it has a very wide working temperature range, and, under the conditions of charging voltage window of 0.8V and charging and discharging current density of 1A / g, it has a relatively stable temperature in the working temperature range. Capacitance retention rate, among them, the capacitance retention rate (relative to 25°C) in the temperature range of -70°C to 100°C is as follows: figure 2 As shown, it can be seen that the capacitance change rate in the temperature range of -50°C to 50°C is less than 10%.

Embodiment 3

[0026] Example 3: Prepare the electrolyte, match with activated carbon as the electrode material, and assemble the symmetrical supercapacitor. Wherein, the solute of the electrolyte is potassium hydroxide of 1.5 mol / L, and the solvent is a supramolecular solvent constructed of deionized water and dimethyl sulfoxide with a molar ratio of 3:1. The working voltage of the device is 0~1V, and it has a very wide working temperature range, and, under the conditions of charging voltage window of 0.8V and charging and discharging current density of 1A / g, it has a relatively stable temperature in the working temperature range. Capacitance retention rate, among them, the capacitance retention rate (relative to 25°C) in the temperature range of -40°C to 80°C is as follows: image 3 As shown, it can be seen that the capacitance change rate in the temperature range of -20°C to 50°C is less than 10%.

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Abstract

The invention discloses a supermolecule-based aqueous alkaline electrolyte with an ultra-wide working temperature range and an application thereof. The aqueous alkaline electrolyte is a solution formed by mixing a solute and a solvent, the solute is one or more than two of alkali metal hydroxides, and the alkali metal hydroxides are lithium hydroxide, sodium hydroxide, potassium hydroxide, rubidium hydroxide or cesium hydroxide; and the solvent is a supramolecular solvent composed of water and dimethyl sulfoxide. The supermolecule-based aqueous alkaline electrolyte with the ultra-wide working temperature range has an extremely wide working temperature range of-70 DEG C to 100 DEG C, is relatively stable in performance, and can greatly improve the applicability of electrochemical energy storage devices such as supercapacitors and batteries based on the aqueous alkaline electrolyte in the all-day, all-season and extreme temperature fields.

Description

technical field [0001] The invention relates to a supramolecular-based aqueous alkaline electrolyte with an ultra-wide working temperature range and an application thereof, belonging to the technical field of electrochemical energy storage. [0002] technical background [0003] The basic components of electrochemical energy storage devices such as aqueous alkaline supercapacitors and batteries are electrodes, diaphragms, and aqueous alkaline electrolytes. Among them, the operating temperature has a significant impact on the ion transport process of the electrolyte, which in turn affects the electrode process. Also greatly affected. In practical applications, the temperature difference between the operating temperature of these energy storage devices between winter and summer or between day and night may exceed tens or even hundreds of degrees Celsius. Therefore, a simple aqueous alkaline electrolyte with a high freezing point consisting only of inorganic bases (electrolytes...

Claims

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Application Information

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IPC IPC(8): H01G11/60H01G11/62
CPCH01G11/60H01G11/62Y02E60/13Y02E60/10
Inventor 王明均
Owner KUNMING UNIV OF SCI & TECH
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