Preparation and application of gel electrolyte for anti-freezing zinc-based battery

A gel electrolyte and battery technology, applied in the direction of electrolyte immobilization/gelation, secondary batteries, circuits, etc., can solve the problem of low ionic conductivity of gel electrolyte, harsh preparation conditions, flexible zinc-based batteries cannot resist low temperature, etc. problems, to achieve stable electrochemical performance, excellent electrochemical performance, and lower condensation temperature

Pending Publication Date: 2021-12-28
CHANGCHUN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems that the existing flexible zinc-based batteries cannot resist low temperature and work normally, the ionic conductivity of the gel electrolyte is low, and the preparation conditions are harsh

Method used

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  • Preparation and application of gel electrolyte for anti-freezing zinc-based battery
  • Preparation and application of gel electrolyte for anti-freezing zinc-based battery
  • Preparation and application of gel electrolyte for anti-freezing zinc-based battery

Examples

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Effect test

Embodiment 1

[0026] At 30°C, 3 g of sodium alginate was dissolved in 40 mL of deionized water. Add acrylamide monomer and zwitterionic monomer with a total mass of 10g in turn and stir evenly, then add potassium persulfate and N, N'-methylenebisacrylamide, so that potassium persulfate in the mixture is 0.05% mol of the monomer , N, N'-methylenebisacrylamide is 0.01% mol of the monomer, mixed thoroughly and evenly, poured into a polytetrafluoroethylene mold with a thickness of 1mm, and reacted at 60°C for 3h to form a hydrogel by free radical polymerization. Dissolve 30g of zinc chloride and 10g of lithium chloride in 50mL of deionized water to prepare a water electrolyte. Under the condition of 30° C., the assembled hydrogel was immersed in the above aqueous electrolyte solution for 3 hours to finally obtain a gel electrolyte.

Embodiment 2

[0028] At 40°C, 2.5g of sodium alginate was dissolved in 40mL of deionized water. Add acrylamide monomer and zwitterionic monomer with a total mass of 15g in turn and stir evenly, then add potassium persulfate and N, N'-methylenebisacrylamide, so that potassium persulfate in the mixture is 0.1% mol of the monomer , N, N'-methylenebisacrylamide is 0.02% mol of the monomer, mixed thoroughly and evenly, poured into a polytetrafluoroethylene mold with a thickness of 1mm, and reacted at 60°C for 4h to form a hydrogel by free radical polymerization. Dissolve 30g of zinc chloride and 10g of lithium chloride in 50mL of deionized water to prepare a water electrolyte. Under the condition of 40° C., the polymerized hydrogel was immersed in the above water electrolyte for 4 hours to finally obtain a gel electrolyte.

Embodiment 3

[0030] At 50°C, 2 g of sodium alginate was dissolved in 40 mL of deionized water. Add acrylamide monomer and zwitterionic monomer with a total mass of 25g in turn and stir evenly, then add potassium persulfate and N, N'-methylenebisacrylamide, so that potassium persulfate in the mixture is 0.15% mol of the monomer , N, N'-methylenebisacrylamide is 0.03% mol of the monomer, mixed thoroughly and evenly, poured into a polytetrafluoroethylene mold with a thickness of 1mm, and reacted at 60°C for 5h to form a hydrogel by free radical polymerization. Dissolve 30g of zinc sulfate and 10g of lithium chloride in 50mL of deionized water to prepare a water electrolyte. Under the condition of 30° C., the polymerized hydrogel was immersed in the above water electrolyte for 12 hours to finally obtain a gel electrolyte.

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Abstract

The invention relates to a gel electrolyte suitable for a -20 DEG C zinc-based battery as well as preparation and application of the gel electrolyte. The invention discloses a preparation method of an anti-freezing gel electrolyte for a zinc-based battery, which aims to reduce the freezing temperature of the gel electrolyte taking sodium alginate-polyacrylamide as a matrix through the synergistic hydration effect of zinc salt and lithium salt. The anti-freezing hydrogel immersed in zinc salt and lithium salt is used as an electrolyte, shows good freezing resistance and mechanical properties, and has excellent low-temperature tolerance and cycle stability. The problems that the conventional electrolyte cannot work normally due to limited use below zero DEG C, the preparation process is tedious and the ionic conductivity is low are overcome.

Description

technical field [0001] The invention relates to the technical field of electrochemical device energy storage, in particular to an antifreeze gel electrolyte of a zinc-based battery and a preparation method and application thereof. Background technique [0002] Metal lithium (Li) has a high theoretical specific capacity (3860 mAh g -1 ), high energy density and extremely low electrode potential are considered to be an ideal battery anode material, and lithium secondary batteries have been widely used in the field of electrochemical energy storage. However, lithium-ion batteries are mostly organic electrolytes, which have a series of safety hazards such as poisonous, easy to leak, and flammable. Emerging aqueous Zn-ion secondary batteries have attracted much attention due to their inherent safety and low cost. Aqueous hybrid Zn-based batteries, as a promising alternative to Li-ion batteries, have achieved considerable development in recent years. Zinc reserves are abundant,...

Claims

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Application Information

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IPC IPC(8): H01M10/36
CPCH01M10/36H01M2300/0085Y02E60/10
Inventor 史丰炜苑春妹田培树
Owner CHANGCHUN UNIV OF TECH
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