Mixed aqueous zinc ion battery electrolyte with stable pH value and application

A zinc-ion battery and electrolyte technology, applied in secondary batteries, secondary battery repair/maintenance, circuits, etc., can solve the problems of high coulombic efficiency and cycle life, unable to achieve pH stability of electrolytes at the same time, and improve the Cycle life and cycle stability, suppression of dendrite formation, effect of avoiding direct contact

Pending Publication Date: 2022-08-05
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the problem that the pH stability of the electrolyte, high coulombic efficiency and cycle life cannot be realized simultaneously in the existing water system zinc ion battery, and further provides a mixed water system zinc ion battery electrolyte with stable pH value and its application

Method used

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  • Mixed aqueous zinc ion battery electrolyte with stable pH value and application
  • Mixed aqueous zinc ion battery electrolyte with stable pH value and application
  • Mixed aqueous zinc ion battery electrolyte with stable pH value and application

Examples

Experimental program
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Effect test

specific Embodiment approach 1

[0019] Embodiment 1: This embodiment is a pH-stable mixed water-based zinc-ion battery electrolyte. The pH-stable mixed water-based zinc-ion battery electrolyte is a mixture of zinc sulfate, zinc trifluoromethanesulfonate and ultrapure water. made;

[0020] The total concentration of zinc sulfate and zinc trifluoromethanesulfonate in the mixed aqueous zinc-ion battery electrolyte with stable pH value is 1 mol / L to 3 mol / L; the zinc sulfate and zinc trifluoromethanesulfonate are The molar ratio is (1~3):1.

[0021] mechanism:

[0022] First, the XPS test was carried out on the surface of the zinc flakes after 100 cycles, and it was found that the surface substances of the zinc flakes in the zinc sulfate electrolyte were still zinc hydroxylated sulfate (ZHS), and the surface substances of the zinc flakes in the zinc trifluoromethanesulfonate electrolyte were still the same. It is mainly hydroxylated zinc trifluoromethanesulfonate, and organic compounds (-CF) are formed on the ...

specific Embodiment approach 2

[0027] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the pH-stable mixed aqueous zinc-ion battery electrolyte is obtained by uniformly mixing an aqueous solution of zinc sulfate and an aqueous solution of zinc trifluoromethanesulfonate. Others are the same as the first embodiment.

specific Embodiment approach 3

[0028] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is: the aqueous solution of zinc sulfate uses ultrapure water as a solvent, and zinc sulfate heptahydrate is added to the ultrapure water after stirring and dissolving. . Others are the same as in the first or second embodiment.

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Abstract

The invention discloses a mixed aqueous zinc ion battery electrolyte with a stable pH value and application, and relates to an electrolyte and application. The invention aims to solve the problem that the pH stability, high coulombic efficiency and cycle life of an electrolyte cannot be realized at the same time in the existing aqueous zinc ion battery. The mixed aqueous zinc ion battery electrolyte with the stable pH value is formed by mixing zinc sulfate, zinc trifluoromethanesulfonate and ultrapure water; the method is applied to the water-based zinc ion battery. The invention provides the mixed aqueous zinc ion battery electrolyte with the stable pH value and the application of the mixed aqueous zinc ion battery electrolyte.

Description

technical field [0001] The present invention relates to an electrolyte and its application. Background technique [0002] Due to the use of fossil fuels, resulting in problems such as waste of resources and environmental pollution, people's demand for clean energy is increasing. But because of the uncertainty of wind, hydro, and solar energy, people have begun to work on the development of energy storage systems. Currently, lithium-ion batteries are the most widely studied. Laptop computers, new energy vehicles, etc. all use lithium-ion batteries. However, lithium-ion batteries have problems such as high price of lithium, environmental pollution of organic electrolytes, and flammability and explosion. Compared with lithium-ion battery systems, due to the advantages of high safety, environmental friendliness, abundant zinc reserves, low cost, and high energy density, aqueous zinc-ion batteries show great potential in the field of large-scale energy storage in the future. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/36H01M10/38H01M10/42
CPCH01M10/36H01M10/38H01M10/4235H01M2300/0011Y02P70/50
Inventor 王义展金诗蕊
Owner JILIN UNIV
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