Aqueous zinc ion battery electrolyte and application thereof

A zinc-ion battery and electrolyte technology, applied in water-based electrolytes, secondary batteries, composite electrolytes, etc., can solve the problems of low coulombic efficiency, low coulombic efficiency of negative electrodes, and performance degradation of zinc negative electrodes, so as to improve the electrochemical window and reduce the Electrochemical activity, the effect of improving cycle life

Pending Publication Date: 2020-11-06
PEKING UNIV SHENZHEN GRADUATE SCHOOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

where ZnSO 4 The main disadvantage is that the positive electrode will produce the discharge by-product Zn 4 (OH) 6 SO 4 ·nH 2 O, and the negative electrode will have obvious zinc dendrite problem
Zn(CF 3 SO 3 ) 2 The main disadvantage is that it is expensive and costly; moreover, its solubility is low, resulting in a low electrolyte voltage window
Zn(ClO 4 ) 2 The main disadvantage is that it has a high

Method used

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  • Aqueous zinc ion battery electrolyte and application thereof
  • Aqueous zinc ion battery electrolyte and application thereof
  • Aqueous zinc ion battery electrolyte and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The electrolyte solution of the water-based zinc-ion battery in this example is specifically composed of solvent water, high-concentration potassium bisfluorosulfonimide (KFSI) and zinc salt, wherein the zinc salt is zinc trifluoromethanesulfonate. Its preparation method is as follows: weigh KFSI according to the mass molar concentration of 32mol / kg, weigh zinc trifluoromethanesulfonate according to the mass molar concentration of 1mol / kg, and dissolve the two in water to obtain the high-concentration KFSI of this example. Aqueous zinc-ion battery electrolyte.

[0031]In addition, as a comparison, prepare a water-based zinc ion electrolyte with a low concentration of potassium bisfluorosulfonimide, specifically, according to the mass molar concentration of KFSI is 1mol / kg, and the mass molar concentration of zinc trifluoromethanesulfonate is 1mol / kg Each component was weighed and dissolved in water to obtain the aqueous zinc-ion battery electrolyte for the comparative t...

Embodiment 2

[0040] The specific composition of the aqueous zinc ion battery electrolyte of this example is water, high-concentration potassium trifluoromethanesulfonate and zinc salt zinc chloride, and is added with functional additive sulfonamide, and its preparation method is as follows: according to the formula of potassium trifluoromethanesulfonate The mass molar concentration is 20mol / kg, the mass molar concentration of zinc chloride is 2mol / kg, and the sulfonamide accounts for 1.5% of the total weight of the electrolyte. Weigh each component and dissolve it in water to obtain the aqueous zinc ion of this example battery electrolyte.

[0041] The same method as in Example 1 was used to observe the growth of dendrites on the surface of the zinc sheet using the electrolyte solution of the aqueous zinc-ion battery of this example. The results show that the surface of the zinc flakes using the high-concentration potassium trifluoromethanesulfonate aqueous zinc ion electrolyte of this exa...

Embodiment 3

[0046] The specific composition of the aqueous zinc-ion battery electrolyte in this example is water, high-concentration potassium bisfluorosulfonimide and zinc salt zinc perchlorate, and polyethylene glycol with a molecular weight of 300 is added as a functional additive. The preparation method is as follows: The mass molar concentration of bisfluorosulfonimide potassium is 20mol / kg, the mass molar concentration of zinc perchlorate is 2mol / kg, and polyethylene glycol accounts for 1% of the total weight ratio of the electrolyte. Weigh each component, dissolve In water, the aqueous zinc-ion battery electrolyte of this example is obtained.

[0047] The same method as in Example 1 was used to observe the growth of dendrites on the surface of the zinc sheet using the electrolyte solution of the aqueous zinc-ion battery of this example. The results show that using the aqueous zinc ion electrolyte with high concentration of potassium bisfluorosulfonimide in this example, 0.2mA / cm 2...

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Abstract

The invention discloses an aqueous zinc ion battery electrolyte and application thereof. The aqueous zinc ion battery electrolyte disclosed by the invention contains solvent water, high-concentrationelectrolyte salt and zinc salt;the zinc salt is a water-soluble salt; the high-concentration electrolyte salt is potassium bis(fluorosulfonyl) imide and/or potassium trifluoromethanesulfonate, and themass molar concentration is not less than 10mol/kg. According to the electrolyte, due to the fact that high-concentration potassium bis(fluorosulfonyl) imide and/or potassium trifluoromethanesulfonate are/is added, a large number of water molecules in the electrolyte can be consumed due to the strong solvation effect, the hydration effect of zinc ions is reduced, and zinc dendrites formed by thezinc ions in dissolution and deposition are inhibited; in addition, the strong solvation effect of the high-concentration electrolyte salt and solvent water molecules can reduce the electrochemical activity of the water molecules, improve the electrochemical window of the electrolyte, reduce the hydrogen evolution reaction, reduce the dissolution effect of zinc, inhibit the decomposition of the water molecules on the surface of the electrode, reduce the corrosion dissolution of the zinc negative electrode and prolong the cycle life of the aqueous zinc ion battery.

Description

technical field [0001] The present application relates to the field of water-based zinc-ion batteries, in particular to an electrolyte solution for water-based zinc-ion batteries and applications thereof. Background technique [0002] Zn-ion batteries based on water-based electrolytes are a low-cost, high-safety, cost-effective new energy storage system, and are expected to replace existing energy storage technologies. At present, the electrolytes of aqueous zinc-ion batteries mainly include zinc sulfate, zinc trifluoromethanesulfonate, zinc perchlorate, zinc chloride, zinc acetate, and zinc nitrate. where ZnSO 4 The main disadvantage is that the positive electrode will produce the discharge by-product Zn 4 (OH) 6 SO 4 ·nH 2 O, and the negative electrode will have more obvious zinc dendrite problems. Zn(CF 3 SO 3 ) 2 The main disadvantage of is that it is expensive and the cost is high; moreover, its solubility is low, resulting in a low voltage window of the electr...

Claims

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Application Information

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IPC IPC(8): H01M10/38H01M10/36H01M10/42
CPCH01M10/36H01M10/38H01M10/4235H01M2300/0002H01M2300/0088Y02E60/10Y02P70/50
Inventor 李锐邓文君
Owner PEKING UNIV SHENZHEN GRADUATE SCHOOL
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