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Battery negative electrode protected by hydrophobic insulating layer, preparation method and battery

A technology of hydrophobic insulating layer and battery negative electrode, applied in the field of electrochemistry, can solve problems such as hydrogen evolution corrosion of zinc and magnesium negative electrodes, and achieve the effects of inhibiting dendrites, improving battery cycle performance, and inhibiting negative electrode hydrogen evolution.

Pending Publication Date: 2022-07-26
杨曦
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to solve the problem of hydrogen evolution corrosion of zinc and magnesium negative electrodes in aqueous electrolyte, the invention provides a battery negative electrode protected by a hydrophobic insulating layer, a preparation method and a battery

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Weigh the ingredients according to alumina (10nm): PTFE: water = 50: 50: 300, mix and stir until uniform, and coat a layer of 20 μm ~ 30 μm thick mixture protective layer on the surface of the zinc foil, which will be coated with the mixture The negative electrode of the protective layer was dried at 80°C, and then dried at 320°C for 30 minutes, and then a 10-20 μm thick mixture of nano-alumina and LA136D binder was sprayed on the protective layer as a reinforcing layer. , the obtained negative electrode was dried at 80°C, and then rolled again, that is, the zinc negative electrode protected by the hydrophobic insulating layer, and the battery was assembled with the negative electrode and the manganese dioxide positive electrode to conduct a charge-discharge cycle test.

Embodiment 2

[0036] Weigh the ingredients according to titanium dioxide (1μm): PTFE: water = 30:70:130, mix and stir until uniform, and coat a layer of 20-30μm thick mixture protective layer on the surface of the carbon-coated aluminum foil galvanized negative electrode. The negative electrode covered with the mixture protective layer was dried at 80°C and hot-pressed at 320°C, which was the zinc negative electrode protected by the hydrophobic insulating layer. The secondary battery was assembled with this negative electrode and the manganese dioxide positive electrode for charge-discharge cycle test.

Embodiment 3

[0038] Weigh the ingredients according to sodium titanium phosphate (1μm): PTFE: water = 40:60:130, mix and stir until uniform, and then coat on the porous alumina-doped polypropylene battery separator with a coating thickness of 10μm~20μm , the battery separator coated with the mixture is dried at 60 °C, and then the side with the mixture coating is attached to the negative electrode of the zinc foil, and hot-pressed at 150 °C, which is the zinc negative electrode protected by the hydrophobic insulating layer. The negative electrode and the manganese dioxide positive electrode assembled battery for charge-discharge cycle test.

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Abstract

According to the battery negative electrode protected by the hydrophobic insulating layer, the preparation method and the battery provided by the invention, a layer of mixture of a solid powder material and a strong hydrophobic binder is arranged on the surface of the battery negative electrode as a negative electrode protection layer, and the protection layer has certain hydrophobic performance and can prevent direct contact between an electrolyte and a negative electrode active substance; according to the present invention, the hydrogen evolution of the negative electrode zinc or the negative electrode magnesium metal is inhibited, the zinc negative electrode has good zinc dendrite inhibition performance, the cycle performance of the secondary zinc battery prepared by using the negative electrode can be significantly improved, and the magnesium battery prepared by using the negative electrode has good storage performance.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and relates to a battery negative electrode protected by a hydrophobic insulating layer, a preparation method and a battery. Background technique [0002] Since petrochemical energy is a non-renewable resource and is highly polluting, most countries are vigorously developing new energy batteries to replace petrochemical energy. Lithium-ion batteries have made great progress in electric vehicles and energy storage. However, commercial lithium-ion batteries The battery uses a flammable organic electrolyte, and the assembly and production conditions are harsh, coupled with the scarcity of lithium resources, making the cost of lithium-ion batteries high. Therefore, it is of great significance to study safe and high-energy-density aqueous batteries. [0003] The theoretical capacity of zinc is 820 mAhg-1, and the theoretical capacity of magnesium is 2200 mAhg-1. Both metal zinc and magnesium...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/02H01M4/04H01M50/443H01M50/446H01M50/46H01M10/36
CPCH01M4/02H01M4/0402H01M4/0435H01M10/36H01M2004/028
Inventor 杨曦
Owner 杨曦
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