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Aqueous zinc ion battery electrolyte as well as preparation method and application thereof

A zinc-ion battery and electrolyte technology, applied in water-based electrolytes, secondary batteries, secondary battery repair/maintenance, etc., can solve problems such as production difficulties and high costs, achieve low prices, alleviate zinc corrosion, and facilitate large-scale production Effect

Pending Publication Date: 2021-08-27
XUZHOU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned methods all have the problems of practical production difficulty and high cost.

Method used

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  • Aqueous zinc ion battery electrolyte as well as preparation method and application thereof
  • Aqueous zinc ion battery electrolyte as well as preparation method and application thereof
  • Aqueous zinc ion battery electrolyte as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A preparation method for an aqueous zinc-ion battery electrolyte, comprising the following steps:

[0028] (1) Dissolve 0.2mol of zinc sulfate heptahydrate in 100mL of deionized water, stir and dissolve under normal temperature conditions to prepare a zinc sulfate solution with a concentration of 2mol / L as the matrix electrolyte;

[0029] (2) Dissolve 0.001 mol of catechol in 100 mL of zinc sulfate matrix electrolyte to prepare a zinc sulfate-catechol electrolyte with a concentration of 0.01 mol / L.

[0030] SEM was used to characterize the surface morphology of the zinc foils that were left to stand for 4h in zinc sulfate-catechol and blank zinc sulfate electrolytes, and the results were as follows figure 1 As shown, it can be clearly seen from the figure that compared with the blank zinc sulfate electrolyte, the surface of the zinc foil standing in the zinc sulfate-catechol electrolyte for 4 hours is smoother.

[0031] Assemble the zinc symmetric battery, test the dep...

Embodiment 2

[0035] A preparation method for an aqueous zinc-ion battery electrolyte, comprising the following steps:

[0036] (1) Dissolve 0.2mol of zinc sulfate heptahydrate in 100mL of deionized water, stir and dissolve under normal temperature conditions to prepare a zinc sulfate solution with a concentration of 2mol / L as the matrix electrolyte;

[0037] (2) Dissolve 0.0005 mol of tannic acid in 100 mL of zinc sulfate solution to obtain a 0.005 mol / L zinc sulfate-tannic acid electrolyte.

[0038] Assembled zinc symmetric cells were tested for electrochemical performance, as Figure 5 As shown, in the electrolyte with tannic acid added to the symmetrical battery, when the concentration of tannic acid is 0.005mol / L, the current density is 4mA / cm 2 , the deposition rate is 4mAh / cm2 Under certain conditions, the cycle life can be as long as 120h.

Embodiment 3

[0040] A preparation method for an aqueous zinc-ion battery electrolyte, comprising the following steps:

[0041] (1) Dissolve 0.2mol of zinc sulfate heptahydrate in 100mL of deionized water, stir and dissolve under normal temperature conditions to prepare a zinc sulfate solution with a concentration of 2mol / L as the matrix electrolyte;

[0042] (2) Dissolve 0.0001 mol α-methyldopa in 100 mL of zinc sulfate matrix electrolyte, stir and dissolve to obtain 0.001 mol / L zinc sulfate-α-methyldopa electrolyte.

[0043] Assembled zinc symmetric cells were tested for electrochemical performance, as Figure 6 As shown, when the concentration of α-methyldopa is 0.001mol / L in the electrolyte solution with α-methyldopa added, the current density is 4mA / cm 2 , the deposition rate is 4mAh / cm 2 Under certain conditions, the cycle life can be as long as 160h.

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Abstract

The invention relates to an aqueous zinc ion battery electrolyte. The electrolyte is composed of a matrix electrolyte and a high-adhesion organic matter containing a catechol functional group, the high-adhesion organic matter containing the catechol functional group is one of catechol, [alpha]-methyldopa, [alpha]-methyldopamine, noradrenaline, gallic acid, gallocatechin, 6-hydroxydopamine, dihydroxyphenylacetamide, dihydroxyphenylethyl thiourea, dihydroxyindoline, dihydroxytryptamine, trihydroxyindole, catechin and tannic acid. The preparation method comprises the following steps: dissolving one of zinc sulfate, zinc chloride and zinc trifluoromethanesulfonate in deionized water, and stirring and dissolving at normal temperature to prepare a matrix electrolyte; d anadding the organic matter into the matrix electrolyte to prepare the electrolyte. The electrolyte can form a stable mussel bionic solid electrolyte interface film on the surface of a zinc negative electrode in situ, dendrite-free deposition of zinc is induced, the cycle performance and coulombic efficiency of the zinc negative electrode are improved, and the electrochemical performance of a zinc ion battery is improved.

Description

technical field [0001] The invention relates to the technical field of water-based zinc-ion batteries, in particular to an electrolyte for a water-based zinc-ion battery and a preparation method and application thereof. Background technique [0002] In recent years, lithium-ion batteries (LIBs) have been widely used in portable electronics due to their high energy density, and are considered for electric vehicles and large-scale energy storage systems. However, growing concerns about cost, safety, limited lithium resources, and environmental impact have prompted the search for alternative battery systems. Compared with conventional organic electrolyte-based lithium-ion batteries, aqueous electrolytes have the advantages of greater safety, lower cost, easier handling, and higher ionic conductivity, and have broad applications in large-scale energy storage. prospect. Among various aqueous metal-ion batteries, rechargeable aqueous zinc-ion batteries (ZIBs) have attracted exte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/42H01M10/38
CPCH01M10/4235H01M10/38H01M2300/0002Y02P70/50Y02E60/10
Inventor 王庆红鲁帅谢凯璇任凯欣赖超
Owner XUZHOU NORMAL UNIVERSITY
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