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Zn-coated Zn-E composite negative electrode, preparation thereof and application of Zn-coated Zn-E composite negative electrode in aqueous zinc ion battery

A zinc ion battery and negative electrode technology, applied in the field of electrochemical energy, can solve the problems of insufficient discharge depth of zinc negative electrode, poor cycle stability and cycle stability, and achieve fast ion transfer, increase electrochemical reaction rate, and good safety performance. Effect

Pending Publication Date: 2022-07-29
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of insufficient discharge depth and poor cycle stability, especially at high current density, in the zinc negative electrode of the aqueous zinc ion battery, the first purpose of the present invention is to provide a Zn@Zn-E composite negative electrode, which aims to provide An anode with high capacity (high depth of discharge), excellent rate capability, and stable cycling at high current densities

Method used

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  • Zn-coated Zn-E composite negative electrode, preparation thereof and application of Zn-coated Zn-E composite negative electrode in aqueous zinc ion battery
  • Zn-coated Zn-E composite negative electrode, preparation thereof and application of Zn-coated Zn-E composite negative electrode in aqueous zinc ion battery
  • Zn-coated Zn-E composite negative electrode, preparation thereof and application of Zn-coated Zn-E composite negative electrode in aqueous zinc ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0084] (1) Equipped with 0.4M zinc sulfate, 0.15M sodium phosphate, 0.08M boric acid, 0.28M sodium sulfate, 0.34M sodium chloride, 0.006M ethylenediaminetetraacetic acid aqueous solution as electrodeposition electrolyte;

[0085] (2) Cut out a zinc foil with a thickness of 0.1 mm to a size of 4.5 × 3.5 cm, place it in 200 ml of absolute ethanol solution for 15 minutes of ultrasound, soak it in 0.1 M hydrochloric acid solution for 5 minutes, and then rinse it with deionized water, Dry at room temperature;

[0086] (3) The treated zinc foil is used as the cathode, the zinc metal is used as the anode, in the electrolyte described in step (1), and the current density is 50 mA cm -2 The zinc anode modified by zinc-phosphorus alloy coating was prepared by electrodeposition at 25°C for 1 minute. Rinse repeatedly with deionized water, rinse the residual electrolyte on the surface, and then dry at room temperature to obtain a modified zinc negative electrode;

[0087] (4) The modifie...

Embodiment 2

[0096] (1) Equipped with 0.1M zinc sulfate, 0.1M sodium phosphate, 0.01M boric acid, 0.1M sodium sulfate, 0.1M sodium chloride, 0.001M ethylenediaminetetraacetic acid aqueous solution as electrodeposition electrolyte;

[0097] (2) Cut out a zinc foil with a thickness of 0.1 mm to a size of 4.5 × 3.5 cm, place it in 200 ml of absolute ethanol solution for 15 minutes of ultrasound, soak it in 0.1 M hydrochloric acid solution for 5 minutes, and then rinse it with deionized water, Dry at room temperature;

[0098] (3) The treated zinc foil is used as the cathode, and the current density is 50 mAcm -2The zinc negative electrode modified by zinc-phosphorus alloy coating was prepared by electrodeposition at 45°C for 30 minutes. Rinse repeatedly with deionized water, rinse the residual electrolyte on the surface, and then dry at room temperature to obtain;

[0099] (4) The modified zinc negative electrode was punched out of a pole piece with a diameter of 14 mm, a 2M zinc sulfate aq...

Embodiment 3

[0102] (1) Equipped with 1M zinc sulfate, 0.5M sodium phosphate, 0.1M boric acid, 0.5M sodium sulfate, 1M sodium chloride, 0.01M ethylenediaminetetraacetic acid aqueous solution as electrodeposition electrolyte;

[0103] (2) Cut out a zinc foil with a thickness of 0.1 mm to a size of 4.5 × 3.5 cm, place it in 200 ml of absolute ethanol solution for 15 minutes of ultrasound, soak it in 0.1 M hydrochloric acid solution for 5 minutes, and then rinse it with deionized water, Dry at room temperature;

[0104] (3) The treated zinc foil is used as the cathode, and the current density is 30 mA cm -2 The zinc anode modified by zinc-phosphorus alloy coating was prepared by electrodeposition at 25°C for 1 minute. Rinse repeatedly with deionized water, rinse the residual electrolyte on the surface, and then dry at room temperature to obtain;

[0105] (4) The modified zinc negative electrode was punched out of a pole piece with a diameter of 14 mm, a 2M zinc sulfate aqueous solution was ...

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Abstract

The invention belongs to the technical field of aqueous zinc ion batteries, and particularly discloses a Zn-coated Zn-E composite negative electrode which comprises a zinc metal substrate and a Zn-E alloy layer deposited on the surface of the zinc metal substrate. In addition, the invention also discloses a preparation method of the negative electrode and an application method of the negative electrode in an aqueous zinc ion battery. The zinc alloy modified zinc negative electrode can circulate under high current density and discharge depth, and the assembled aqueous zinc ion total battery has excellent circulation and rate performance. In addition, the preparation method is simple, efficient and low in cost, and further application of the water-based zinc ion battery is promoted.

Description

technical field [0001] The invention relates to a zinc metal negative electrode modified by a zinc alloy coating, a preparation method thereof, and an aqueous zinc ion full battery assembled by the same, belonging to the technical field of electrochemical energy. Background technique [0002] With the increasingly serious global environmental problems, the development of new green energy storage devices is imminent. Aqueous zinc-ion batteries have gradually become a research hotspot due to their high safety performance and low cost. However, the main problems of zinc dendrites, hydrogen evolution, and side reactions in the zinc metal anode limit the further development of aqueous zinc-ion batteries. In order to solve these problems, a large number of current researches mainly focus on the surface modification of zinc foil, such as literature (Deng C, Xie X, Han J, et al. A sieve-functional and uniform-porous kaolin layer toward stable zinc metal anode [J] .AdvancedFunction...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/42H01M10/36
CPCH01M4/628H01M4/42H01M10/36H01M2004/021H01M2004/027
Inventor 杨娟曹鹏辉周向阳刘卫平杨岳云唐晶晶刘敏
Owner CENT SOUTH UNIV