Method for inhibiting zinc dendritic crystal growth by using polydopamine film

A technology of polydopamine film and dopamine, which is applied in the direction of electrochemical generators, electrical components, battery electrodes, etc., can solve the problems of high cost, difficult to scale up, complex process, etc., and achieve controllable conditions, simple operation, and cheap raw materials. The effect

Pending Publication Date: 2021-02-09
XUZHOU NORMAL UNIVERSITY
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Problems solved by technology

However, the above methods have problems such as complex process, high cost or difficulty in scale, so the practical application of zinc-ion batteries still faces severe challenges

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Dissolve 0.25mmol dopamine hydrochloride in 100mL deionized water, adjust the pH value to 8.5 with Tris-HCl buffer solution, then immerse a 2cm*2cm zinc sheet in the above solution for 4 hours, then take out the zinc sheet and wash it 3 times with deionized water , vacuum-dried at 40° C. for 12 hours to obtain a zinc / polydopamine composite electrode.

[0017] The surface morphology of the zinc / polydopamine composite electrode was characterized by SEM, as shown in figure 1 As shown, the polydopamine film is evenly adsorbed on the surface of the zinc foil, and the surface of the composite electrode is flat.

[0018] The electrochemical performance of the symmetrical battery assembled with pure zinc foil and zinc / polydopamine composite electrodes was tested, and the electrolyte was 2mol L -1 zinc sulfate solution with a current density of 1mA cm -2 , with a deposition volume of 1mAh cm -2 .

[0019] Such as figure 2 As shown, compared with the pure zinc electrode, th...

Embodiment 2

[0023] Dissolve 0.5mmol dopamine hydrochloride in 100mL deionized water, adjust the pH value to 11 with Tris-HCl buffer solution, then immerse a 2cm*2cm zinc sheet in the above solution for 4 hours, then take out the zinc sheet and wash it 3 times with deionized water , vacuum-dried at 40° C. for 12 hours to obtain a zinc / polydopamine composite electrode.

Embodiment 3

[0025] Dissolve 0.2mmol dopamine hydrochloride in 100mL deionized water, adjust the pH value to 11 with Tris-HCl buffer solution, then immerse a 2cm*2cm zinc sheet in the above solution for 4 hours, then take out the zinc sheet and wash it with deionized water for 3 times , vacuum-dried at 40° C. for 12 hours to obtain a zinc / polydopamine composite electrode.

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Abstract

A method for inhibiting zinc dendritic crystal growth by using a polydopamine film comprises the steps: a zinc foil is soaked in a dopamine solution, and a polydopamine film layer is formed on the surface of zinc by adjusting the concentration of dopamine, the pH value of the solution, the polymerization time and the reaction temperature; the dopamine-modified zinc foil is used as the negative electrode of the secondary battery, and structural characterization after charge-discharge circulation shows that the surface of the electrode is smooth, and no obvious dendritic crystal is generated; and the polydopamine has strong metallophilicity, a stable protective layer is formed on the surface of the zinc foil, and the deposition of zinc is limited in a limited space, so that the growth of zinc dendrites is effectively inhibited, and the cycle life of the zinc negative electrode is prolonged. The method disclosed by the invention is simple in process, easy in reaction condition control, environment-friendly and beneficial to performance optimization and practical application of the zinc negative electrode.

Description

technical field [0001] The invention belongs to the field of water-based zinc ion batteries, and in particular relates to a method for inhibiting zinc dendrites through a polydopamine film. Background technique [0002] The rapid development of industries such as new energy vehicles and large-scale energy storage has put forward more stringent requirements on the energy density, power density, cycle life and safety of energy storage systems. Commercial lithium-ion batteries have high output voltage and high energy density, but lithium resources are limited, its cost is high, and the safety of organic electrolytes is poor. Therefore, the exploration of new secondary battery systems has become a research focus. Among them, the aqueous rechargeable Zn-ion battery has the following characteristics: zinc reserves are abundant, and the aqueous electrolyte is highly safe, which is expected to realize low-cost manufacturing and safe use of the battery at the same time; zinc has a lo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/42H01M10/36H01M10/42
CPCH01M4/366H01M4/42H01M10/36H01M10/4235Y02E60/10
Inventor 王庆红谢凯璇赖超吴翠平任凯欣
Owner XUZHOU NORMAL UNIVERSITY
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