Zinc/graphene three-dimensional composite structure negative electrode for zinc battery and preparation method thereof

A three-dimensional composite and three-dimensional structure technology, applied in the direction of electrode manufacturing, battery electrodes, negative electrodes, etc., can solve the problems of limited contact interface, unfavorable device magnification, power, etc., achieve strong negative electrode stability, improve the growth of zinc dendrites, Effect of bendable mechanical properties

Inactive Publication Date: 2021-08-31
CAPITAL NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Using traditional zinc sheets, the contact interface between the negative electrode and the elect

Method used

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  • Zinc/graphene three-dimensional composite structure negative electrode for zinc battery and preparation method thereof
  • Zinc/graphene three-dimensional composite structure negative electrode for zinc battery and preparation method thereof
  • Zinc/graphene three-dimensional composite structure negative electrode for zinc battery and preparation method thereof

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preparation example Construction

[0024] The invention provides a preparation method of a zinc / graphene three-dimensional composite structure negative electrode for zinc batteries, comprising the following steps:

[0025] (1) Using polyimide fiber paper or polyimide film as carbon source, CO 2 The laser is the heat source, and the three-dimensional graphene layer is prepared by laser induction to obtain laser-induced graphene, such as figure 1 and 2 shown.

[0026] (2) Using the laser-induced graphene as the working electrode and the zinc sheet as the reference electrode and the counter electrode, immersed in the electrolyte solution, using an electrochemical workstation, electroplating at a constant voltage in the range of -1.0 to -0.8V for 20–60 min, The zinc / graphene three-dimensional composite structure negative electrode is obtained, such as image 3 shown.

[0027] The electrolyte solution used in the electroplating process is a weak acid zinc salt aqueous solution.

[0028] Another embodiment of th...

Embodiment 1

[0030] Using porous polyimide fiber paper as carbon source, CO 2 The laser is the heat source, the power is 15W, the scanning speed of the laser beam is 15 cm / s, and the induction preparation is 1×2 cm 2 Graphene region obtained by laser-induced graphene. figure 1 The SEM morphology of the laser-induced graphene prepared in Example 1.

[0031] The laser-induced graphene was used as the working electrode, and two zinc sheets were used as the reference electrode and the counter electrode, respectively, immersed in a 2M zinc sulfate aqueous solution, and electroplated at a constant voltage of – 0.9 V for 40 min using an electrochemical workstation to obtain three-dimensional zinc / graphene. Composite structure negative electrode. image 3 This is the SEM image of the zinc / graphene three-dimensional composite structure negative electrode prepared in Example 1.

Embodiment 2

[0033] Using porous polyimide membrane as carbon source, CO 2 The laser is the heat source, the power is 20W, the scanning speed of the laser beam is 50 mm / s, and the induction preparation is 2×2 cm 2 Graphene region obtained by laser-induced graphene. figure 2 It is the SEM topography of the laser-induced graphene prepared in Example 2.

[0034] The laser-induced graphene was used as the working electrode, and the two zinc sheets were used as the reference electrode and the counter electrode, respectively, immersed in a 3 M zinc sulfate aqueous solution, and electroplated at a constant voltage of – 0.8 V for 25 min using an electrochemical workstation to obtain zinc / Graphene three-dimensional composite structure anode.

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Abstract

The invention discloses a zinc/graphene three-dimensional composite structure negative electrode for a zinc battery and a preparation method thereof. The preparation method comprises the following steps of: taking polyimide fiber paper or a polyimide film as a carbon source, taking CO2 laser as a heat source, and preparing a three-dimensional graphene layer by using a laser irradiation induction method to obtain laser-induced graphene; and taking the laser-induced graphene of a three-dimensional structure as a working electrode, taking a zinc sheet as a reference electrode and a counter electrode, immersing the working electrode and the zinc sheet into an electrolyte solution, and electroplating under constant voltage to obtain the zinc/graphene three-dimensional composite structure negative electrode. The zinc/graphene negative electrode of the three-dimensional structure has the advantages of bendable material, light weight and high cycling stability, can improve the rate and power performance of a battery, and can prolong the charge-discharge cycle life of a device.

Description

technical field [0001] The invention belongs to the fields of material science and electrochemical energy storage devices, and particularly relates to a zinc / graphene three-dimensional composite structure negative electrode for zinc batteries and a preparation method thereof. Background technique [0002] With the continuous consumption of fossil energy and the aggravation of environmental pollution, it is urgent to promote the development and use of high-efficiency renewable energy such as wind, solar, and tidal energy. To achieve large-scale application, electric energy has received extensive attention as a clean energy source. Based on the continuous emergence of various smart electronic products and electric vehicles, the demand for electrical energy storage is also increasing. At present, lithium-ion battery technology is relatively mature, and it has a very considerable energy and power density, but the limited lithium resources and the safety problems caused by the u...

Claims

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Application Information

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IPC IPC(8): H01M4/66H01M4/80H01M4/04H01M4/38H01M10/38
CPCH01M4/0452H01M4/38H01M4/663H01M4/80H01M10/38H01M2004/027Y02E60/10Y02P70/50
Inventor 宋卫星
Owner CAPITAL NORMAL UNIVERSITY
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