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Aqueous zinc ion energy storage device

A zinc ion and energy storage technology, applied in the field of energy storage devices, can solve problems such as incomplete desolvation

Inactive Publication Date: 2021-09-10
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the desolvation of electrolyte additives reported so far is not complete, and there will still be a small amount of highly active free water molecules released at the negative electrode to induce side reactions.

Method used

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  • Aqueous zinc ion energy storage device

Examples

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Effect test

Embodiment 1

[0033] This embodiment provides a water-based zinc-ion battery, including a positive electrode, a negative electrode, a separator, and an electrolyte. The electrolyte includes a solvent and a solute, and the electrolyte also includes a water-soluble chelating agent EDTA sodium salt with a concentration of 0.05M. The solute is ZnSO 4 , the solvent is deionized water. The negative electrode is a dense metal zinc foil, and the positive electrode includes a conductive substrate and an active material, wherein the active material is MnO 2 , The conductive substrate is carbon paper.

[0034] The preparation method of the aqueous zinc-ion battery comprises the following steps:

[0035]The first step: zinc metal sheet pretreatment: the zinc metal sheet with a thickness of 0.1 mm was ultrasonically cleaned three times with deionized water and absolute ethanol, each time for 10 minutes, and then dried in a blast oven at 70°C. The above-mentioned dried metal sheets are blasted into zi...

Embodiment 2

[0042] This embodiment provides a water-based zinc-ion battery, including a positive electrode, a negative electrode, a separator, and an electrolyte. The electrolyte includes a solvent and a solute, and the electrolyte also includes a water-soluble chelating agent EDTA sodium salt with a concentration of 0.05M. The solute is ZnSO 4 , the solvent is deionized water. The negative electrode is a dense metal zinc foil, and the positive electrode includes a conductive substrate and an active material, wherein the active material is V 2 o 5 , The conductive substrate is carbon paper.

[0043] The preparation method of this aqueous zinc ion battery comprises the steps:

[0044] The first step: zinc metal sheet pretreatment: the zinc metal sheet with a thickness of 0.1 mm was ultrasonically cleaned three times with deionized water and absolute ethanol, each time for 10 minutes, and then dried in a blast oven at 70°C. The above-mentioned dried metal flakes are blasted into zinc me...

Embodiment 3

[0049] This embodiment provides an aqueous zinc-ion battery, including a positive electrode, a negative electrode, a separator, and an electrolyte. The electrolyte includes a solvent and a solute, and the electrolyte also includes a water-soluble chelating agent NTA sodium salt at a concentration of 0.07M. The solute is ZnCl 2 , the solvent is sea water. The negative electrode is a porous zinc metal mesh, and the positive electrode includes a conductive substrate and an active material, wherein the active material is V 2 o 5 , The conductive substrate is carbon cloth.

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Abstract

The invention belongs to the field of energy storage devices, and particularly relates to an aqueous zinc ion energy storage device, which comprises a positive electrode, a negative electrode, an isolating membrane and an electrolytic solution, wherein the electrolytic solution comprises a solvent and a solute, and also comprises an additive, and the additive is a water-soluble chelating agent. Compared with the prior art, by adding the low-cost chelating agent additive into the zinc salt electrolytic solution of the secondary battery system, the chelating molecules can be adsorbed on the surface of a negative electrode so as to inhibit side reaction between active metal and the electrolytic solution and improve the corrosion resistance, and the zinc ions on the surface are more difficult to separate from the chelating agent for deposition to increase the deposition overpotential so as to promote the active metal to have more uniform deposition sites in the deposition process while the water-soluble chelating agent molecules are adsorbed on the surface of the zinc negative electrode, so that surface local charges can be uniform, and then the dendrite-free metal negative electrode is obtained.

Description

technical field [0001] The invention belongs to the technical field of energy storage devices, in particular to a water system zinc ion energy storage device. Background technique [0002] Currently, ZnSO 4 It is a more suitable cheap zinc salt, and its aqueous solution is due to Zn 2+ The hydrolysis is weakly acidic, and is widely used in secondary aqueous zinc-ion batteries. But in the aqueous electrolyte, due to the Zn 2+ with H 2 There is a strong solvation effect between O molecules, making Zn 2+ During desolvation, a higher energy barrier needs to be jumped to convert Zn 2+ From zinc sulfate-hydrated ion association ([Zn(H 2 O) 6 2+ SO 4 2- ]) in the solvation sheath to detach from the process of zinc deposition, resulting in low coulombic efficiency of zinc anode. At the same time, Zn 2+ During the desolvation process of the negative electrode interface, a large amount of active water molecules will be released on the negative electrode surface, which will...

Claims

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Application Information

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IPC IPC(8): H01M10/36H01M10/42
CPCH01M10/36H01M10/4235H01M2300/0002Y02E60/10
Inventor 张辰孟蓉炜杨全红凌国维
Owner TIANJIN UNIV
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