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Three-dimensional zinc/carbon composite material for zinc-based battery and preparation method of three-dimensional zinc/carbon composite material

A carbon composite material, zinc-based battery technology, applied in battery electrodes, nickel storage batteries, alkaline storage batteries, etc., can solve the problems of poor conductivity of zinc negative electrode, poor electrochemical performance, degradation of cycle life, etc., and achieve high conductivity High performance, high energy density, high repeatability

Inactive Publication Date: 2018-02-09
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve the technical problems of nickel-zinc batteries in the prior art, such as poor electrical conductivity and generation of dendrites in the zinc negative electrode, resulting in poor electrochemical performance, cycle life attenuation, and even battery failure.

Method used

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  • Three-dimensional zinc/carbon composite material for zinc-based battery and preparation method of three-dimensional zinc/carbon composite material
  • Three-dimensional zinc/carbon composite material for zinc-based battery and preparation method of three-dimensional zinc/carbon composite material
  • Three-dimensional zinc/carbon composite material for zinc-based battery and preparation method of three-dimensional zinc/carbon composite material

Examples

Experimental program
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Effect test

Embodiment 1

[0036] A three-dimensional zinc / carbon composite electrode, which is prepared through the following steps:

[0037] (1) Mix 400g of zinc oxide and 100g of polyacrylonitrile (the mass ratio of the two is 4:1), disperse into 50g of N,N dimethylformamide, and then stir in a beaker at room temperature for about 24 hours ; figure 2 A mesh map that has been extruded 3D printed.

[0038] (2) put into the circular mold through the system of step (1), carry out setting under 20 MPa;

[0039] (3) Carry out high-temperature carbonization at 550°C, then carry out compression molding treatment on the obtained product and then perform electrochemical reduction: use an electrochemical workstation, use a three-electrode system, and use a voltage- 50mV for electrochemical reduction, and the product is a three-dimensional zinc (zinc oxide) / carbon composite electrode.

[0040] In the technical solution of the present invention, carbon and zinc oxide are obtained after heat treatment, and all...

Embodiment 2

[0051] This embodiment provides a three-dimensional zinc metal electrode, the preparation method of which is basically the same as that of embodiment 1, except that the mass ratio of zinc oxide and polyacrylonitrile is 10:1. The three-dimensional zinc metal electrode is made into a working electrode according to the method provided by the present invention and the corresponding electrical performance test is carried out. The results are as follows: when charging and discharging at 1C, the stable specific capacity is 480mAh / g; when charging and discharging at the above rate, 500mAh / g After repeated charging and discharging, the capacity can maintain more than 70% of the initial capacity.

Embodiment 3

[0053] This example provides a three-dimensional zinc metal electrode, the preparation method of which is basically the same as that of Example 1, the difference is that the mass ratio of zinc oxide to polyacrylonitrile is 0.5:1.

[0054] The three-dimensional zinc metal electrode is made into a working electrode according to the method provided by the present invention and the corresponding electrical performance test is carried out. The results are as follows: when charging and discharging at 1C, the stable specific capacity is 400mAh / g; when charging and discharging at the above rate, 500mAh / g After repeated charging and discharging, the capacity can maintain more than 60% of the initial capacity.

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Abstract

The invention provides a three-dimensional zinc / carbon composite material for a zinc-based battery. The three-dimensional zinc / carbon composite material comprises a carbon conducting network of a three-dimensional multistage structure and zinc and / or zinc oxide loaded on the carbon conducting network, wherein the mass ratio of the zinc and / or the zinc oxide is 50-95%; the three-dimensional carbonconducting network is obtained through carbonization treatment of a polymer and has a macroporous, mesoporous and microporous pore structure; the shapes and forms of the zinc and the zinc oxide loadedon the three-dimensional carbon conducting network are one or more of a globular shape, a rod shape and a needle shape independently; and the sizes of the zinc and the zinc oxide are 10nm to 20 microns. The invention further provides a preparation method of the composite material. The three-dimensional zinc / carbon composite material provided by the invention has an ordered porous structure and high conductivity, has excellent electrochemical properties and cycle stability when used as a negative electrode of a nickel-zinc battery, and can be widely applied to the fields of various portable electronic devices, electric vehicles and aerospace.

Description

technical field [0001] The invention belongs to the field of energy materials, and in particular relates to a zinc-based battery negative electrode material and a preparation method thereof. Background technique [0002] With the continuous breakthrough of electronic technology and the international attention to energy and environmental protection, the research and development of new green secondary power batteries has always been one of the hot spots of major scientific and technological development plans in various countries. Based on the high energy density of new materials and technologies, there is no Pollution, new systems of recyclable green batteries are constantly emerging, rapidly developing into a new generation of portable electronic product support power supply and electric vehicles, hybrid power supply. The current power battery market includes lead-acid batteries, nickel-cadmium batteries, nickel-metal hydride batteries and lithium-ion batteries, but there are...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/42H01M4/583H01M4/62H01M10/30
CPCH01M4/362H01M4/42H01M4/583H01M4/62H01M10/30Y02E60/10
Inventor 杨树斌丁军伟李彬
Owner BEIHANG UNIV
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