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Negative pole piece of a zinc secondary battery and its preparation method and application

A technology for secondary batteries and negative pole pieces, applied in secondary batteries, battery electrodes, electrode manufacturing, etc., can solve the problems of complex preparation process, high cost, and difficult application, and achieve simple preparation method, easy operation, and inhibition The effect of zinc dendrite growth

Active Publication Date: 2022-05-13
THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

None of the methods mentioned in this document can fundamentally solve the uneven deposition caused by the concentration gradient in the solution. In addition, this method can only inhibit the growth of zinc dendrites to a certain extent.
[0006] The methods mentioned above cannot fundamentally solve the uneven deposition caused by the concentration gradient in the solution. In addition, these methods can only inhibit the growth of zinc dendrites to a certain extent. At the same time, their preparation processes are complicated, costly, and expensive. Difficult to apply to actual production
[0007] Therefore, how to fundamentally overcome the safety problems of the existing zinc metal negative electrode, such as dendrite growth caused by uneven deposition of zinc during charging and discharging, and flatulence caused by electrolyte corrosion, is a technical problem that needs to be solved urgently.

Method used

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  • Negative pole piece of a zinc secondary battery and its preparation method and application
  • Negative pole piece of a zinc secondary battery and its preparation method and application
  • Negative pole piece of a zinc secondary battery and its preparation method and application

Examples

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Embodiment 1

[0047] This embodiment provides a negative electrode sheet of a zinc secondary battery, wherein the negative electrode sheet includes a zinc sheet and a composite protective layer on the surface of the zinc sheet; the composite protective layer includes copper nanoparticles and zinc fluoride.

[0048] The thickness of the composite protective layer is 2 μm.

[0049] The preparation method of the negative pole sheet of the zinc secondary battery is as follows:

[0050] Soak the polished zinc flakes in an absolute ethanol solution of copper fluoride, wherein the amount of copper fluoride added is 1.5wt% of absolute ethanol, soak for 24 hours, take out the zinc flakes, clean them ultrasonically, dry them, and dry them The zinc sheet was cut into small discs with a diameter of 12 mm to obtain the negative electrode sheet of the zinc secondary battery.

[0051] From figure 1 It can be concluded that the surface of the modified zinc sheet is evenly covered with a layer of zinc flu...

Embodiment 2

[0053] This embodiment provides a negative electrode sheet of a zinc secondary battery. The negative electrode sheet includes a zinc sheet and a composite protective layer on the surface of the zinc sheet; the composite protective layer includes indium nanoparticles and zinc fluoride.

[0054] The thickness of the composite protective layer is 2 μm.

[0055] Soak the polished zinc sheet in anhydrous methanol solution of indium fluoride, wherein the amount of indium fluoride added is 1.5wt% of absolute ethanol, soak for 12h, take out the zinc sheet, ultrasonically clean, dry, and dry The zinc sheet was cut into small discs with a diameter of 12 mm to obtain the negative electrode sheet of the zinc secondary battery.

Embodiment 3

[0057] This embodiment provides a negative electrode sheet of a zinc secondary battery. The negative electrode sheet includes a zinc sheet and a composite protective layer on the surface of the zinc sheet; the composite protective layer includes copper nanoparticles and zinc fluoride.

[0058] The thickness of the composite protective layer is 1.5 μm.

[0059] The difference between this example and Example 1 is: the amount of copper fluoride added in this example is 1 wt% of absolute ethanol, and the standing time is 48h.

[0060] All the other preparation methods and parameters are consistent with Example 1.

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Abstract

The invention provides a negative pole piece of a zinc secondary battery, a preparation method and application thereof. The negative electrode sheet includes a zinc-containing metal substrate and a composite protective layer on the surface of the substrate; the composite protective layer includes metal nanoparticles and zinc fluoride. The present invention can effectively form a stable composite protective layer composed of metal nanoparticles embedded in the zinc fluoride coating on the surface of the zinc metal negative electrode through the method of in-situ chemical replacement, and can provide abundant nucleation sites for the uniform deposition of zinc point, making the deposition of zinc more uniform and dense, which can effectively inhibit the corrosion caused by the electrolyte and the growth of zinc dendrites in the charge-discharge cycle of the zinc secondary battery, thereby greatly improving the cycle performance and safety of the zinc secondary battery .

Description

technical field [0001] The invention belongs to the technical field of zinc secondary batteries, and relates to a negative pole piece of a zinc secondary battery, a preparation method and application thereof. Background technique [0002] The rapid transformation from traditional fossil energy to low-carbon energy is a major change in the national energy pattern. In order to further improve the flexibility, economy and safety of energy storage and meet the rapid development of society, the development of new large-scale energy storage technology is the primary task facing contemporary scientists. Therefore, it is imperative to develop energy storage systems that are environmentally friendly, harmless, and have high energy density to realize the national green energy strategy. Recently, aqueous zinc-ion batteries (ZIBs) have received great attention as the most favorable candidates due to the low redox potential of the zinc anode, high theoretical capacity and excellent stab...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/02H01M4/62H01M4/04H01M10/36
CPCH01M4/02H01M4/628H01M4/04H01M10/36H01M2004/021H01M2004/027Y02E60/10
Inventor 穆延璐葛广路李德兴周天易
Owner THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA