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Preparation method and application of zinc sheet with surface coating

A surface coating and zinc flake technology, which is applied in electrode manufacturing, electrode heat treatment, active material electrodes, etc., can solve the problem of unfavorable long-term cycle performance and coulombic efficiency of zinc-ion batteries, damage the cycle performance of zinc-ion batteries, and cannot effectively resist zinc flakes Corrosion and other problems, achieve good desolvation effect, rich reserves, and improve electrochemical performance

Pending Publication Date: 2022-06-07
XI AN JIAOTONG UNIV
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  • Application Information

AI Technical Summary

Problems solved by technology

However, during the charging and discharging process, due to the uneven surface of the metallic zinc anode, a tip effect occurs during the charge deposition process, and zinc ions tend to grow at the tip leading to dendrites, which seriously impairs the cycle life of zinc-ion batteries. performance, and even cause a short circuit in the battery
In addition, since zinc ions associate with solvent water molecules to form water and zinc ions, it is necessary to overcome a large nucleation energy barrier when zinc ions are deposited, which is extremely detrimental to the long-term cycle performance and coulombic efficiency of zinc-ion batteries.
[0003] Surface coating is considered to be an effective way to improve the problem of zinc anode, but most of the surface coatings used at this stage have single functions and cannot effectively resist the corrosion of water and oxygen on zinc sheets
In order to enhance the adhesion between the coating material and the surface of zinc metal, most work will use a binder that requires organic solvents to dissolve, and the use of organic solvents sacrifices the advantages of low cost of zinc-ion batteries to a certain extent, and at the same time reduces the cost. safety
In addition, complex preparation processes are used in many works to obtain surface coating materials with specific structures and shapes, which will bring great difficulties to large-scale production and are not suitable for large-scale promotion.
Therefore, it is necessary to further optimize the problems of high cost and low safety in the preparation process of the surface coating. Secondly, a multifunctional surface coating should be developed to improve the electrochemical performance of zinc-ion batteries, and at the same time enhance the corrosion resistance of zinc flakes , fundamentally solve the problems of low coulombic efficiency, large nucleation energy barrier and poor cycle performance of zinc anode

Method used

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  • Preparation method and application of zinc sheet with surface coating
  • Preparation method and application of zinc sheet with surface coating
  • Preparation method and application of zinc sheet with surface coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The preparation of zinc flakes with surface coating in this embodiment includes the following steps:

[0035] (1) Measure 3mL of deionized water into a 5mL glass vial with a measuring cylinder, slowly add 225mg of diatomite powder under stirring conditions, and continue stirring for 1h at a speed of 500r / mim to obtain a uniform dispersion;

[0036] (2) The dispersion liquid obtained in step 1) is evenly coated on the surface of the zinc flakes, and the thickness is controlled to be 5 μm;

[0037] (3) The zinc flakes in step (2) were quickly transferred to a vacuum drying oven at 30° C. for 30 min, and then cooled to obtain a zinc flake with a surface coating, denoted as LAP@Zn.

[0038] The dispersion liquid obtained in step 1) of this embodiment is as figure 1 As shown, the clear, homogeneous optical photographs show that the lithodiatomite is completely dispersed in deionized water.

Embodiment 2

[0040] The preparation of zinc flakes with surface coating in this embodiment includes the following steps:

[0041] (1) Measure 2 mL of deionized water into a 3 mL glass vial with a measuring cylinder (add 2 mg of methylene blue powder at the same time), slowly add 80 mg of diatomite powder under stirring conditions, and continue to stir at a speed of 300 r / mim for 0.5 h to obtain a uniform dispersion. ;

[0042] (2) The dispersion liquid obtained in step 1) is evenly coated on the surface of the zinc flakes, and the thickness is controlled to be 8 μm;

[0043] (3) The zinc flakes coated with the dispersion in step (2) were quickly transferred to a vacuum drying oven at 60° C. for 30 min, taken out and cooled to obtain zinc flakes with a surface coating, denoted as LAP@Zn.

[0044] In order to test the anti-corrosion performance of the surface coating, a small amount of methylene blue dye added in step 1) is only used for color marking. The comparative example is that the me...

Embodiment 3

[0046] The preparation of zinc flakes with surface coating in this embodiment includes the following steps:

[0047] (1) Measure 2 mL of deionized water into a 3 mL glass vial with a measuring cylinder, slowly add 100 mg of diatomite powder under stirring conditions, and continue stirring at a speed of 400 r / mim for 1.5 h to obtain a dispersion;

[0048] (2) The dispersion liquid obtained in step 1) is evenly coated on the surface of the zinc flakes, and the thickness is controlled to be 10 μm;

[0049](3) The zinc flakes coated with the dispersion in step (2) were quickly transferred to a vacuum drying oven at 120° C. for 30 min, taken out and cooled to obtain zinc flakes with a surface coating, denoted as LAP@Zn.

[0050] The zinc flakes with surface coating prepared in this example are characterized by scanning electron microscope, and the scanning electron microscope images of the cross section and surface are as follows: image 3 It can be seen that the obtained surface ...

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Abstract

The invention relates to a preparation method and application of a zinc sheet with a surface coating, and the preparation method comprises the following steps: 1) slowly adding laponite powder into a solvent under a stirring condition, and continuously stirring to obtain a uniform dispersion liquid; 2) uniformly coating the surface of a zinc sheet with the dispersion liquid prepared in the step 1) according to a preset thickness; and (3) rapidly transferring the zinc sheet treated in the step (2) to a vacuum drying condition, heating to 60 DEG C, preserving heat, taking out and cooling to obtain the zinc sheet with a surface coating. The preparation conditions are simple, the uniform surface coating for protecting the negative electrode of the zinc ion battery can be obtained only through the steps of mixing, stirring, smearing, drying and the like, harsh reaction conditions are not needed, the cost is low, and the efficiency is high; moreover, the adopted laponite is rich in reserves and low in price, toxic and harmful solvents are not needed in the preparation process, the preparation method is environmentally friendly, and the obtained surface coating is uniform, stable in electrochemical property and good in cycling stability.

Description

technical field [0001] The invention relates to the technical field of surface coating preparation, in particular to a preparation method and application of a zinc flake with a surface coating. Background technique [0002] Rechargeable aqueous zinc-ion batteries show broad application prospects in the field of large-scale energy storage due to their high safety, low cost, and environmental friendliness. However, during the charge-discharge process, due to the uneven surface of the metal Zn anode, a tip effect will occur during the charge deposition process, and the zinc ions are more inclined to grow at the tip leading to the generation of dendrites, which seriously impairs the cycling of the Zn-ion battery. performance, and even lead to a short circuit of the battery. In addition, due to the association of zinc ions with solvent water molecules to form water and zinc ions, a large nucleation energy barrier needs to be overcome during zinc ion deposition, which is extremel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M10/36
CPCH01M4/0402H01M4/0409H01M4/0471H01M10/36H01M2004/027Y02E60/10
Inventor 丁书江封婕李新阳
Owner XI AN JIAOTONG UNIV
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