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Metal zinc negative electrode with uniform mesoporous structure coating and preparation method and application thereof

A mesoporous structure, metal zinc technology, applied in the direction of negative electrode, electrode manufacturing, structural parts, etc., can solve the problem of low utilization rate of zinc metal negative electrode, achieve the effect of reducing battery short circuit, reducing side reactions, and improving safety performance

Active Publication Date: 2019-11-05
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at the problems of irreversibility and low utilization rate of the zinc metal negative electrode in the prior art, the purpose of the present invention is to provide a metal zinc negative electrode with a uniform mesoporous structure coating and its preparation method and application. Form a stable ion-conducting protective layer on the interface of the active material to suppress the generation of dendrites or protrusions on the surface, and improve the safety and utilization of the battery

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  • Metal zinc negative electrode with uniform mesoporous structure coating and preparation method and application thereof
  • Metal zinc negative electrode with uniform mesoporous structure coating and preparation method and application thereof
  • Metal zinc negative electrode with uniform mesoporous structure coating and preparation method and application thereof

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Embodiment 1

[0040] In an embodiment of the present invention, a method for preparing a metal zinc negative electrode with a uniform mesoporous structure coating comprises the following steps:

[0041] (1) The preparation of coated klZn negative electrode is the same as Comparative Example 2;

[0042] (2) The coated zinc foil (klZn) with a coating thickness of 21 μm was subjected to a trace zinc pre-deposition treatment, that is, the klZn was used as the positive electrode and the zinc foil was used as the negative electrode to assemble a button battery. -2 Discharge 15min under constant current, obtain the coated zinc foil (deposited klZn) of pre-deposited trace zinc; With this pre-deposited coated zinc foil as negative electrode, MnO 2 The pole piece is a positive electrode assembly button battery, and all the other conditions are the same as in Comparative Example 1, and the battery performance results are as follows: image 3 .

[0043] image 3 a is the charge and discharge curve o...

Embodiment 2

[0045] In an embodiment of the present invention, a method for preparing a metal zinc negative electrode with a uniform mesoporous structure coating comprises the following steps:

[0046] (1) The preparation of coated klZn negative electrode is the same as Comparative Example 2;

[0047] (2) The coated zinc foil (klZn) with a coating thickness of 21 μm is subjected to a trace zinc pre-deposition treatment, that is, a button battery is assembled with the klZn as the positive electrode and the zinc foil as the negative electrode, and the assembled battery operates at 10mA cm -2 Discharge 15min under the constant current, obtain the coated zinc foil (deposited klZn) of pre-deposited trace zinc, take this pre-deposited coated zinc foil as the negative electrode, MnO 2 The pole piece is a positive electrode assembly button battery, and all the other conditions are the same as in Comparative Example 1, and the battery performance results are as follows: Figure 4 .

[0048] Fig...

Embodiment 3

[0050] In an embodiment of the present invention, a method for preparing a metal zinc negative electrode with a uniform mesoporous structure coating comprises the following steps:

[0051] (1) The preparation of coated klZn negative electrode is the same as Comparative Example 2;

[0052] (2) The coated zinc foil (klZn) with a coating thickness of 21 μm was subjected to a trace zinc pre-deposition treatment, that is, a button battery was assembled with the klZn as the positive electrode and the zinc foil as the negative electrode, and the assembled battery operated at 20mA cm -2 Discharge 15min under constant current, obtain the coated zinc foil (deposited klZn) of pre-deposited trace zinc; With this pre-deposited coated zinc foil as negative electrode, MnO 2 The pole piece is a positive electrode assembly button battery, and all the other conditions are the same as in Comparative Example 1, and the battery performance results are as follows: Figure 5 .

[0053] Figure 5 ...

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Abstract

The invention discloses a metal zinc negative electrode with a uniform mesoporous structure coating and a preparation method and application thereof, belonging to the technical field of aqueous zinc ion batteries. The metal zinc negative electrode comprises a zinc negative electrode and a clay slurry layer, and is prepared by pre-embedding zinc. The raw material powder of the clay slurry includes1-20wt% of polyvinylidene fluoride and 80-90wt% of clay material. The aqueous zinc ion battery negative electrode coating presented in the invention can play a role of a protective layer, isolate thedirect contact between the zinc negative electrode and the electrolyte to a certain extent, reduce the side reaction between the electrode and the electrolyte and improve the cycle stability. The layered porosity of the material itself can prevent dendrites from being generated and penetrating a diaphragm in the cycle process, alleviate the volume expansion of the negative electrode, reduce the occurrence of short circuit of the battery and improve the safety performance.

Description

technical field [0001] The invention belongs to the technical field of water-based zinc-ion batteries, and in particular relates to a metal zinc negative electrode with a uniform mesoporous structure coating and a preparation method and application thereof. Background technique [0002] Aqueous zinc-ion batteries have the advantages of low cost, high operating safety, and environmental friendliness, and have broad prospects for development in the development of new energy sources. However, when the traditional aqueous zinc-ion battery is performing charge-discharge cycles, the surface of the metal zinc negative electrode will have a local concentration of the electric field due to the "tip effect", resulting in the uneven deposition and enrichment of zinc ions, which will eventually lead to the growth of zinc dendrites. In turn, it leads to rapid depletion of battery capacity and even short circuit, which is considered to be an important factor restricting the long-term stab...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/42H01M4/02H01M4/04H01M10/36
CPCH01M4/02H01M4/0402H01M4/42H01M4/624H01M4/628H01M10/36H01M2004/021H01M2004/027Y02E60/10
Inventor 周江陈鲜红梁叔全邓灿彬解雪松
Owner CENT SOUTH UNIV
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