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Preparation method of zinc-copper alloy negative electrode with self-supporting structure

A self-supporting structure, zinc-copper alloy technology, applied in structural parts, electrode manufacturing, battery electrodes, etc., can solve the problems of uneven zinc deposition, difficulty in mass production, and difficulty in ensuring alloy uniformity.

Active Publication Date: 2021-08-20
安徽凯斯威精工科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the method of electrochemical deposition is commonly used to deposit zinc metal on the surface of copper plate or copper mesh, and one way to form zinc-copper alloy is to use the deposited composite metal as the negative electrode material to assemble a full battery and then charge and discharge it many times. Zinc-copper alloys are formed after cycling. Another way is to form zinc-copper alloys through high-temperature heat treatment on the deposited composite metals. However, due to the uneven deposition of zinc formed by the electrochemical deposition method, it is difficult to ensure the formation of alloys in the subsequent method of forming alloys. Uniformity, and from an industrial point of view, the electrochemical deposition method is complex and costly to operate, and it is not easy to achieve mass production

Method used

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  • Preparation method of zinc-copper alloy negative electrode with self-supporting structure
  • Preparation method of zinc-copper alloy negative electrode with self-supporting structure
  • Preparation method of zinc-copper alloy negative electrode with self-supporting structure

Examples

Experimental program
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Effect test

Embodiment 1

[0049] S1. Surface pretreatment of zinc block and copper mesh: prepare zinc block, copper mesh, alcohol, concentrated hydrochloric acid, acetone; use wire brush, sandpaper or grinding wheel to remove oxides on the surface of zinc block, and then wipe with acetone and alcohol to remove surface oil , set aside; wipe the copper grid with acetone and alcohol to remove surface oil, then soak it with concentrated hydrochloric acid to remove oxides on the surface of the copper grid, take out the copper grid, wipe it again with alcohol to remove residual hydrochloric acid, then dry it with a hair dryer, and set aside;

[0050] S2. Put the zinc block into the graphite crucible, heat and smelt in the electromagnetic induction furnace with argon protection atmosphere, and spontaneously stir the zinc melt under the action of electromagnetic force to ensure the uniformity of smelting;

[0051] S3. Control the temperature of the pure zinc liquid to 600°C, take out the molten zinc liquid, rem...

Embodiment 2

[0054] S1. Grind the zinc block and the copper mesh with a wire brush to remove the surface oxide, then clean them with acetone and alcohol, soak the copper mesh with concentrated hydrochloric acid, wipe it again with alcohol after taking it out, and then dry it with a hair dryer;

[0055] S2. Put the zinc block into the graphite crucible, heat and smelt in the electromagnetic induction furnace with argon protection atmosphere, and spontaneously stir the zinc melt under the action of electromagnetic force to ensure the uniformity of smelting;

[0056] S3. Control the temperature of the pure zinc liquid to 500°C, take out the molten zinc liquid, remove the slag and oxides on the surface of the solution, and put the 200-mesh H65 brass mesh with a wire diameter of 0.051 mm into the molten zinc for 8 seconds. (approximately 1t) and take it out for natural cooling to obtain the required zinc-copper alloy.

[0057] S4, making the prepared zinc-copper alloy into negative electrode di...

Embodiment 3

[0059] Performance evaluation (1) of the electrode that zinc-copper alloy of the present invention is made

[0060] The negative electrode pellets obtained in Example 1 are assembled into a symmetrical battery, at 1mA cm -2 Cycling performance tests were performed under current density and compared with V 2 o 5 The positive electrode is assembled into a full battery at 2A g -1 The performance test was carried out under the current density, and the electrolyte was 3MZn(CF 3 SO 3 ) 2 , the diaphragm is glass fiber filter paper.

[0061] The electrochemical test is carried out by Wuhan Landian System (CT2001A), and the test capacity of the symmetrical battery is limited to 0.25mAh cm -2 , the electrochemical window of the full battery test is 0.3-1.6V, V 2 o 5 The preparation of the positive electrode is to V 2 o 5 Mix with conductive carbon and polyvinylidene fluoride in a ratio of 7:2:1, drop into N-methyl-2-pyrrolidone solution and stir evenly, then apply it to condu...

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Abstract

The invention relates to the field of storage battery technology, and discloses a method for preparing a self-supporting structure zinc-copper alloy negative electrode for an aqueous zinc-ion battery, which includes the following steps: S1, surface pretreatment process of zinc block and copper mesh; S2, zinc Block melting process; S3, copper mesh galvanizing process; S4, zinc-copper alloy negative electrode material forming process. The present invention prepares a zinc-copper alloy negative electrode with a self-supporting three-dimensional structure, improves the corrosion resistance of the negative electrode, and has obvious inhibitory effect on dendrite growth, and the smelting hot-dip plating method of the present invention is easy to operate, compared with the electrode prepared by electrochemical deposition. Alloying method, easy to achieve mass production, greatly reducing production costs.

Description

technical field [0001] The invention belongs to the technical field of accumulators, and in particular relates to a method for preparing a self-supporting structure zinc-copper alloy negative electrode for an aqueous zinc-ion battery. Background technique [0002] Zinc, as an anode material for water-based zinc-ion batteries, is non-polluting, non-toxic, green and safe, has abundant zinc reserves, low redox potential, and high theoretical specific capacity (820mAh / g). Because it can work in a water system environment, it can Choose an aqueous electrolyte that is cheaper, safer and more reliable than non-aqueous electrolytes. In addition, the zinc anode has good reversibility of stripping and deposition, and has a high hydrogen evolution potential in a weakly acidic environment. However, the main reason why it is not widely used in actual production is that the zinc anode The problems of corrosion and vertical growth of dendrites in acidic media are difficult to solve. [00...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/42H01M4/04C23C2/06C23C2/34H01M10/36
CPCC23C2/06C23C2/34H01M4/0488H01M4/42H01M10/36Y02E60/10
Inventor 余超付伦祁梓宸王雨萌肖宏
Owner 安徽凯斯威精工科技有限公司
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