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Aqueous zinc ion battery electrolyte additive

An electrolyte additive, zinc-ion battery technology, applied in water-based electrolytes, secondary batteries, acidic electrolytes, etc., can solve the problems of insufficient site coverage, weak inhibition of hydrogen evolution reaction, weak molecular adsorption and binding force, etc.

Active Publication Date: 2021-04-09
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polarity-induced molecular adsorption binding is too weak for polymer electrolyte additives to achieve thorough coverage of sites
For metal ions, the surface adsorption has little effect on inhibiting the hydrogen evolution reaction (HER).

Method used

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  • Aqueous zinc ion battery electrolyte additive
  • Aqueous zinc ion battery electrolyte additive
  • Aqueous zinc ion battery electrolyte additive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] This embodiment provides a method for using an amino acid electrolyte additive:

[0028] The additive used in this embodiment is:

[0029]

[0030] Wherein m is 0, n is 1, wherein K2 (basic amino acid residue) is selected from arginine, that is, the additive is arginine of amino acids.

[0031] Dissolve 0.01 mol of arginine and 0.3 mol of zinc sulfate in deionized water to prepare 100 ml of electrolyte solution containing 3 mol / L zinc sulfate and 0.1 mol / L arginine. One of the Ti flakes / Zn flakes / Cu mesh was placed in the electrolyte as a current collector for the electrodeposition of zinc. The deposition morphology of zinc was as follows: figure 1 a, Zinc deposition without obvious dendrites. The zinc deposition was then observed in situ with an optical microscope, as shown in figure 2 a, It can be seen from the figure that there are no obvious bubbles during the deposition process, reflecting that the hydrogen evolution reaction is not obvious during the zinc d...

Embodiment 2

[0036] This example provides a method of using a lipopeptide electrolyte additive:

[0037] The additive used in this embodiment is:

[0038]

[0039] Where m is 1, and K1 is a saturated carbon chain in the fatty acid acyl chain, which corresponds to a fatty acid with a carbon number of 12, that is, a lauric acid acyl chain.

[0040] n is 4, wherein K2 (basic amino acid residue) is selected from lysine.

[0041] That is, the additive is a lipopeptide composed of lauric acid (containing 12 carbons) and 4 lysine polycondensed, which is abbreviated as C12K4 in this example (C12 refers to the acyl chain of lauric acid, and K refers to the residue of lysine).

[0042]Dissolve 0.001 mol of additive C12K4 and 0.1 mol of zinc sulfate in deionized water to prepare 100 ml of electrolyte solution containing 1 mol / L zinc sulfate and 0.01 mol / L lipopeptide. One of the Ti flakes / Zn flakes / Cu mesh was placed in the electrolyte as a current collector for the electrodeposition of zinc. Th...

Embodiment 3

[0044] This example provides a method of using a lipopeptide electrolyte additive:

[0045] The additive used in this embodiment is:

[0046]

[0047] Wherein m is 1, K1 is the saturated carbon chain in the fatty acid acyl chain, and its corresponding fatty acid carbon number is 24, namely the acyl chain of lignoceric acid.

[0048] n is 1, wherein K2 (basic amino acid residue) is selected from lysine.

[0049] That is, the additive is a lipopeptide formed by polycondensation of lignoceric acid (containing 24 carbons) and 1 lysine, which is abbreviated as C24K1 in this example (C24 refers to the acyl chain of lignoceric acid, and K1 refers to a lysine residue).

[0050] Dissolve 0.01 mol of additive C24K1 and 0.2 mol of zinc chloride in deionized water to prepare 100 ml of electrolyte solution containing 2 mol / L zinc chloride and 0.1 mol / L lipopeptide. One of the Ti sheet / Zn sheet / Cu mesh is placed in the electrolyte as a current collector for zinc electrodeposition, and ...

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Abstract

The invention discloses a zinc ion battery electrolyte additive. The additive is amino acids, lipopeptides or polypeptides; an electrolyte is a zinc salt electrolyte, i.e., an electrolytezinc formed by dissolving salt is in deionized water; the concentration of the zinc salt in the electrolyte is 1-3mol / L; and the concentration of the additive added in the electrolyte is 0.01-0.5 mol / L. The additive disclosed by the invention contains alkaline amino acid residues, and can be in a positively charged state in a weakly acidic electrolyte; and the positively charged amino acids, lipopeptides or polypeptides can be adsorbed to favorable nucleation sites of zinc to promote uniform deposition of zinc ions in a zinc deposition process, so that full coverage of the favorable nucleation sites is realized, and dendritic crystal-free growth is realized. The additive has the advantages of inorganic ions and organic polymer additives at the same time, so that dendritic crystal-free growth and corrosion inhibition of a zinc negative electrode are realized, and the cycle life of a battery is prolonged.

Description

technical field [0001] The invention relates to the field of new energy materials, in particular to technologies related to zinc ion batteries and their electrolytes. Background technique [0002] Increasing energy consumption and environmental issues are driving the rapid development of renewable energy technologies (such as wind energy, solar energy, and tidal energy), and correspondingly, human society's demand for efficient and reliable electrical energy storage systems is also increasing day by day. Among the currently available battery systems, lithium-ion batteries (LIBs) have long been the most attractive and widely used electrical energy storage systems owing to their long cycle life and relatively desirable gravimetric energy density. It is worth mentioning that the gravimetric energy density of LIBs has exceeded 240Wh kg-1, and it is theoretically possible to exceed 500Wh kg-1. Nevertheless, the problems of high cost, low safety and unfriendly environment of LIBs...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/42H01M10/36
CPCH01M10/4235H01M10/36H01M2300/0005Y02E70/30
Inventor 姜银珠罗明贺卢浩天
Owner ZHEJIANG UNIV
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