A kind of electrolyte solution for rechargeable zinc ion battery, its preparation method and rechargeable zinc ion battery

A zinc-ion battery and electrolyte technology, applied in secondary batteries, aqueous electrolytes, circuits, etc., can solve the problems of low electrolyte voltage window, zinc anode dendrite growth, short cycle life and other problems, and achieve good cycle rate performance, The effect of preventing dendrite growth and improving cycle life

Active Publication Date: 2021-06-25
HEBEI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] One of the purposes of the present invention is to provide a kind of electrolyte that can be used for zinc ion battery, to solve the poor compatibility between zinc negative electrode and traditional aqueous electrolyte in existing zinc ion battery, zinc negative electrode dendrite growth, corrosion, passivation, Problems such as low electrolyte voltage window, easy hydrogen / oxygen evolution, low coulombic efficiency of zinc deposition / precipitation, and poor rate performance
[0007] The third object of the present invention is to provide a rechargeable zinc-ion battery to solve the problems of low coulombic efficiency, fast capacity decay, and short cycle life of existing zinc-ion batteries.

Method used

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  • A kind of electrolyte solution for rechargeable zinc ion battery, its preparation method and rechargeable zinc ion battery
  • A kind of electrolyte solution for rechargeable zinc ion battery, its preparation method and rechargeable zinc ion battery
  • A kind of electrolyte solution for rechargeable zinc ion battery, its preparation method and rechargeable zinc ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Mix 0.5 mL deionized water and 0.5 mL DEC solvent, add 0.73 g Zn(OTf) to the mixed solution 2 Zinc salt, fully oscillated, ultrasonic at room temperature for 10 minutes to completely dissolve the zinc salt, and mix the two solvents completely to obtain 2 mol / kg Zn(OTf) 2 -H 2 O / DEC (1:1) electrolyte.

[0044] Gained electrolyte is carried out following performance test:

[0045] (1) Flame retardant performance

[0046] Ignition test: use a lighter to ignite the electrolyte prepared in this embodiment, and observe its combustion. The result is as figure 1 As shown in a, it shows that the electrolyte prepared in this example cannot be ignited by an open flame at all, and has a good flame retardant effect.

[0047] (2) Conductivity

[0048] The conductivity of the electrolyte prepared in this example was tested by the AC impedance method, and the experimental data were recorded on a CHI660E electrochemical workstation. The results show that the conductivity of the e...

Embodiment 2

[0064] Mix 0.7 mL deionized water and 0.3 mL DEC solvent, add 0.73 g Zn(OTf) to the mixed solution 2 Zinc salt, fully oscillate, ultrasonic for 2 minutes at room temperature to completely dissolve the zinc salt, and mix the two solvents completely to obtain 2 mol / kg Zn(OTf) 2 -H 2 O / DEC (7:3) electrolyte.

[0065] The obtained electrolyte was tested for flame retardancy, thermal stability, electrical conductivity and electrochemical performance. The test results show that the electrolyte is non-combustible, the conductivity is as high as 40 mS / cm, and the voltage window is stable from -0.3 V to 2.2 V. The initial coulombic efficiency of the deposition / precipitation of zinc ions in the electrolyte on the zinc anode was 87%, and then stabilized to about 96%, which can be achieved at 1 mA / cm 2 Stable cycle for more than 30 cycles under the current density.

Embodiment 3

[0067] Mix 0.5 mL deionized water and 1 mL DEC solvent, add 1.1 g Zn(OTf) to the mixed solution 2 Zinc salt, fully oscillated, ultrasonic at room temperature for 10 minutes to completely dissolve the zinc salt, and mix the two solvents completely to obtain 2 mol / kg Zn(OTf) 2 -H 2 O / DEC (1:2) electrolyte.

[0068] The obtained electrolyte was tested for flame retardancy, thermal stability, electrical conductivity and electrochemical performance. The test results show that the electrolyte is nonflammable, and the increase in the content of carbonate solvent reduces the conductivity of the electrolyte to 14 mS / cm, and the voltage window is stable from -0.3 V to 2.6 V. The initial coulombic efficiency of the deposition / precipitation of zinc ions in the electrolyte on the zinc anode is 75%, the coulombic efficiency of the first 30 cycles is low between 85 and 90%, and then stabilizes to about 98%.

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Abstract

The invention provides an electrolyte for a rechargeable zinc ion battery, a preparation method thereof and a rechargeable zinc ion battery. The electrolyte uses water and an organic carbonate solvent as the electrolyte solvent, and a zinc salt as the electrolyte salt, wherein The carbonate solvent volume is 30%~70% of the solvent volume, and the zinc salt concentration is 1~4 mol / kg. The electrolyte of the invention has high electrical conductivity, good safety and good electrochemical stability, and has strong interaction between anions and cations in the electrolyte, carbonate molecules and water molecules, effectively inhibits the activity of water molecules, and improves the voltage window. , to improve the Coulombic efficiency of Zn deposition / precipitation. The electrolyte has good compatibility with the zinc anode, and effectively solves the problems of dendrite growth, hydrogen evolution, corrosion, etc. faced by the zinc anode in traditional aqueous electrolytes. Using it in a rechargeable zinc-ion battery system can significantly improve the battery's cycle stability. The battery system has high safety, low cost, good electrochemical performance, meets the needs of large-scale energy storage, and has good application prospects.

Description

technical field [0001] The invention relates to a battery electrolyte, in particular to an electrolyte for a rechargeable zinc ion battery, a preparation method thereof and a rechargeable zinc ion battery. Background technique [0002] Lithium-ion batteries have achieved great success in portable electronic devices, and are gradually developing rapidly in new energy vehicles, renewable resource storage and other fields. However, lithium resources are scarce, unevenly distributed and expensive, and the use of flammable organic electrolytes is likely to cause serious safety issues, which to some extent limits its application in large-scale energy storage systems. Therefore, it is imperative to develop alternative electrochemical energy storage technologies. [0003] Rechargeable water-based zinc-ion batteries are considered to be one of the ideal options for large-scale energy storage due to their high safety and low cost, and have attracted extensive attention from researche...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/36
CPCH01M10/36H01M2300/0002Y02E60/10
Inventor 张宁董阳狄胜利赵东东徐建中
Owner HEBEI UNIVERSITY
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