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Additive-containing zinc-ion battery electrolyte, preparation method thereof, and zinc-ion battery

A zinc-ion battery, electrolyte technology, applied in secondary batteries, secondary battery repair/maintenance, circuits, etc., can solve the problems of positive and negative material contact, positive electrode material dissolution, electrolyte decomposition, etc., to prevent direct contact , Improve stability and prolong service life

Active Publication Date: 2022-03-22
浙江金羽新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still some problems to be solved in zinc-ion batteries, such as zinc dendrite growth, electrolyte decomposition, positive electrode material dissolution, etc. The main reason for these problems is that the positive and negative electrode materials are in direct contact with the aqueous electrolyte.
[0003] In order to obtain better application effect of zinc-ion batteries, it is a common solution to improve the electrolyte. For example, patent CN112652825A adds fluoride salt to the electrolyte. Fluoride salt can form insoluble fluoride on the zinc surface to protect the zinc negative electrode. , but it only improves the electrochemical performance of zinc anode

Method used

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  • Additive-containing zinc-ion battery electrolyte, preparation method thereof, and zinc-ion battery
  • Additive-containing zinc-ion battery electrolyte, preparation method thereof, and zinc-ion battery
  • Additive-containing zinc-ion battery electrolyte, preparation method thereof, and zinc-ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Configure electrolyte: weigh zinc sulfate heptahydrate and dissolve it in ionized water to form 2mol / L ZnSO 4 Solution, take 100ml and add an appropriate amount of 98% sulfuric acid to adjust the pH of the solution to 2.8, then dissolve 1.02g sodium molybdate (0.05mol / L) in the solution, mix well, and configure a colorless and clear electrolyte.

[0056] Battery assembly: Grind and clean the surface of 0.1mm thick zinc foil, cut a φ15mm disc as the negative pole piece; choose MnO 2 As the positive electrode active material, a certain mass of positive electrode active material, acetylene black and polyvinylidene fluoride is weighed according to the mass ratio of 85:10:5, and the materials are mixed, coated and dried to make electrode sheets, and then cut into φ13mm The disc is used as the positive pole piece; take the glass fiber diaphragm, cut out a φ19mm disc for use; stack the negative pole piece, the diaphragm, and the positive pole piece in order and put them into a...

Embodiment 2

[0062] Configure the electrolyte: Weigh zinc methanesulfonate and sodium methanesulfonate powders and dissolve them in deionized water to form 1mol / L NaSO 3 CH 3 +1mol / L of Zn(CH 3 SO 3 ) 2 solution, take 100ml and add an appropriate amount of 98% methanesulfonic acid to adjust the pH of the solution to 3, then weigh 5.15g (0.25mol / L) of sodium molybdate and dissolve it in the solution, and finally configure it into a clear light green electrolyte.

[0063] Battery assembly: by the method for embodiment 1, wherein positive electrode material is LiMn 2 o 4 .

[0064] Battery test: The battery performance test is carried out by using constant current and constant voltage charging and discharging. The charging and discharging voltage range is 0.8V~1.95V, and the rate current is 0.2C.

[0065] The battery test performance results are shown in Table 1.

Embodiment 3

[0067] Configure electrolyte: take zinc methanesulfonate powder and dissolve it in deionized water to form 2mol / L Zn(CH 3 SO 3 ) 2 solution, take 100ml and add an appropriate amount of 98% methanesulfonic acid to adjust the pH of the solution to 1.5, add 10vol% DMSO, then weigh 5g (0.1mol / L) of bismuth methanesulfonate and dissolve it in the solution, and finally configure into a colorless transparent electrolyte.

[0068] Battery assembly: by the method for embodiment 1, wherein positive electrode material is MnO 2 .

[0069] Battery test: The battery performance test is carried out by constant current charge and discharge method, the charge and discharge voltage range is 0.8~1.9V, and the rate current is 0.3C.

[0070] The battery test performance results are shown in Table 1.

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Abstract

The invention discloses an additive-containing zinc ion battery electrolyte, a preparation method and a zinc ion battery. The electrolyte of the present invention includes additives, electrolyte salts and solvents; the additives are at least one of oxo acid salts or organic compounds containing S and F substituted groups. An additive is added to the electrolyte of the present invention, and the additive will produce a precipitate as the pH value of the electrolyte increases, and the precipitate will not dissolve with the change of pH. When it is applied to the battery, based on the pH change of the environment at the contact interface between the electrode material and the electrolyte, an inorganic solid protective film can be formed on the surface of the electrode material to prevent the material from directly contacting the electrolyte, thereby preventing the material from being eroded and dissolved by the electrolyte. , and improve the cycle stability of positive and negative electrode materials.

Description

technical field [0001] The invention relates to the technical field of zinc ion batteries, in particular to an additive-containing zinc ion battery electrolyte, a preparation method thereof and a zinc ion battery. Background technique [0002] Zinc-ion battery is a battery system that uses metal zinc as the negative electrode material and the electrolyte is a neutral or slightly acidic aqueous solution. It has high energy density, is inherently non-flammable and low-cost, and is very suitable for large-scale energy storage. , Distributed energy storage scenarios. However, there are still some problems to be solved in zinc-ion batteries, such as zinc dendrite growth, electrolyte decomposition, and dissolution of positive electrode materials. The main reason for these problems is that the positive and negative electrode materials are in direct contact with the aqueous electrolyte. [0003] In order to get better application effect of zinc ion battery, it is a common solution ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/36H01M10/42
CPCH01M10/4235H01M10/0567H01M10/054Y02E60/10
Inventor 黄杜斌刘兴坤王春源李爱军何鑫魏海旭杨扬
Owner 浙江金羽新能源科技有限公司