Preparation method and application of metal zinc negative electrode of aqueous zinc ion battery

A zinc-ion battery, metal zinc technology, applied in electrode manufacturing, battery electrodes, negative electrodes, etc., can solve problems such as short circuit, battery capacity decay, low Coulomb efficiency, etc.

Pending Publication Date: 2022-03-11
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, unfavorable reactions such as dendrites, corrosion, and passivation in the zinc anode greatly limit its working life, and easily cause battery capacity decay, low Coulombic efficiency, and even short-circuit problems.

Method used

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  • Preparation method and application of metal zinc negative electrode of aqueous zinc ion battery
  • Preparation method and application of metal zinc negative electrode of aqueous zinc ion battery
  • Preparation method and application of metal zinc negative electrode of aqueous zinc ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Weigh 500 mg of three-dimensional graphene, add it to 48 mL of concentrated sulfuric acid, ultrasonically disperse it for 4 hours, then add 16 mL of concentrated nitric acid, and stir at reflux at 60 ° C for 6 hours;

[0035] (2) suction-filtering the solution stirred in step (1), and cleaning the obtained filter residue with deionized water to neutral or weakly acidic;

[0036] (3) freeze-drying the sample cleaned by suction filtration in step (2) for 30 hours to obtain a three-dimensional graphene oxide powder, which is set aside;

[0037] (4) Punch the zinc foil into a disc with a diameter of 14 mm, ultrasonically clean it with deionized water and absolute ethanol in turn until it is clean, and vacuum dry it for later use;

[0038] (5) Get 7 mg of three-dimensional graphene oxide obtained in step (3), add 14 ml of deionized water, and configure a three-dimensional graphene oxide solution of 0.5 mg / mL;

[0039] (6) Put the dried zinc sheet in step (4) into a smal...

Embodiment 2

[0041] All the other conditions were the same as in Example 1, except that the soaking time of the zinc flakes was changed to 20min, and then vacuum drying was taken out for subsequent use.

Embodiment 3

[0043] All the other conditions were the same as in Example 1, except that the soaking time of the zinc sheet was changed to 30min, and then vacuum drying was taken out for subsequent use.

[0044] Choose the symmetrical button battery of CR2032 that each two pieces of composite zinc sheets prepared by each embodiment are assembled into CR2032, compare with the symmetrical battery assembled into by two pure zinc sheets after cleaning up, at 1mA·cm -2 Current density, 1mAh·cm -2 The electrochemical deposition / stripping cycle performance test was carried out under the areal capacity.

[0045] The result is as Figure 4 to Figure 6 ,in, Figure 5 It is the time-voltage comparison diagram obtained in Example 2. Compared with Example 1 and Example 3, the cycle stability of Example 2 is greatly improved, indicating that the reaction time is 20 minutes as the optimal reaction time. When the immersion time is too short, the surface of the zinc sheet cannot be completely covered by ...

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Abstract

The modified zinc sheet comprises a metal zinc sheet and a three-dimensional graphene oxide layer coating the surface of the metal zinc sheet, the three-dimensional graphene oxide layer is obtained by in-situ reaction and deposition of three-dimensional graphene oxide. Meanwhile, the inventor also establishes a corresponding preparation method. The modified zinc sheet can be used as a metal zinc negative electrode of an aqueous zinc ion battery. The surface of the three-dimensional graphene oxide has rich oxygen-containing groups, so that the growth of zinc dendrites is effectively inhibited, and the service life of the battery is greatly prolonged; in addition, compared with the modification method of the current aqueous zinc ion battery negative electrode, the zinc negative electrode material is prepared by adopting a liquid phase soaking method, the required equipment is very common, and the preparation process is simple, green, environment-friendly and easy to popularize. The ZnZn symmetric battery is assembled by the ZnZn nano-material, and the cycle stability test shows that the ZnZn nano-material can stably circulate for more than or equal to 120 hours under the current density of 1mA. Cm <-2 >.

Description

technical field [0001] The invention belongs to the technical field of battery material preparation, and in particular relates to a preparation method and application of a metal zinc negative electrode of an aqueous zinc ion battery. Background technique [0002] As a new secondary energy source with high energy density and power density, lithium-ion battery has a wide range of applications and prospects in 3C electronic smart products, electric vehicles and other fields. However, due to the limitation of metal lithium resources, the safety and environmental problems caused by the flammability of the organic electrolyte used, as well as the high manufacturing cost, greatly restrict the further development and utilization of lithium-ion batteries. [0003] At present, the aqueous zinc-ion battery has attracted the attention of researchers because of its safe, economical, environmentally friendly, and non-toxic aqueous electrolyte, and it is a strong competitor for the next ge...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/42H01M4/04H01M10/36
CPCH01M4/366H01M4/42H01M4/04H01M10/36H01M2004/027Y02E60/10
Inventor 何会兵秦弘宇胡楠黄燕平张晓艳马俊杰白俊雨
Owner GUANGXI UNIV
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