Three-dimensional nickel hydroxide-graphene composite material, and preparation method and application thereof

A technology of nickel hydroxide and composite materials, applied in nickel storage batteries, electrical components, battery electrodes, etc., can solve the problems of limited practical application of zinc-nickel battery preparation methods, and achieve good cycle stability, simple process, and high repeatability. Effect

Inactive Publication Date: 2018-01-19
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the characteristics and limited preparation methods of zinc-nickel batteries still limit their practical application.

Method used

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  • Three-dimensional nickel hydroxide-graphene composite material, and preparation method and application thereof
  • Three-dimensional nickel hydroxide-graphene composite material, and preparation method and application thereof
  • Three-dimensional nickel hydroxide-graphene composite material, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A three-dimensional nickel hydroxide-graphene composite material, which is prepared through the following steps:

[0033] (1) Mix 500g of nickel hydroxide and 100g of graphene oxide (graphene) (the mass ratio of the two is 5:1), disperse it in 2100g of water, then seal it in a hydrothermal kettle, and react it at 180±5°C for 12 about hours; the photo of the prepared gel is shown in figure 1 .

[0034] (2) Freeze-drying to obtain a solid product, which is a three-dimensional nickel hydroxide-graphene composite material. The result is a spongy porous three-dimensional composite material that forms a conductive network with micropores, mesopores, and macropores.

[0035] The morphology of the obtained three-dimensional nickel hydroxide-graphene composite was characterized. figure 2 Showing the microscopic morphology of the material, it can be seen that the three-dimensional nickel hydroxide-graphene composite material is composed of graphene and spherical nickel hydrox...

Embodiment 2

[0043] Embodiment 2 provides a kind of three-dimensional nickel hydroxide-graphene composite material, and its preparation method is basically the same as embodiment 1, and difference is that the mass ratio of its raw material nickel hydroxide and graphene oxide (graphene) is 10:1 . (nickel hydroxide and graphene are respectively 1000 mass parts and 100 mass parts, water 4200 mass parts)

[0044]The three-dimensional nickel hydroxide-graphene composite material is made into a working electrode according to the same method as in Example 1 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 200mAh / g; at the above-mentioned rate When charging and discharging under high pressure, the capacity can maintain more than 70% of the initial capacity after 500 times of repeated charging and discharging.

Embodiment 3

[0046] This example provides a kind of three-dimensional nickel hydroxide-graphene composite material, and its preparation method is basically the same as embodiment 1, and difference is that the mass ratio of its raw material nickel hydroxide and graphene oxide (graphene) is 0.5:1 ( Nickel hydroxide and graphene are respectively 50 mass parts and 100 mass parts, water 210 mass parts).

[0047] The three-dimensional nickel hydroxide-graphene composite is made into a working electrode according to the same method as in Example 1 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 180mAh / g; at the above-mentioned rate When charging and discharging under high pressure, the capacity can maintain more than 60% of the initial capacity after 500 times of repeated charging and discharging.

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Abstract

The invention provides a three-dimensional nickel hydroxide-graphene composite material. The three-dimensional nickel hydroxide-graphene composite material consists of a three-dimensional-structured conductive network and nickel hydroxide loaded on the conductive network; the three-dimensional conductive network of the composite material consists of graphene oxide nanosheets, and comprises pore structures of macropores, micropores and mesoporous; the nickel hydroxide loaded on the three-dimensional conductive network is 50 nanometers to 500 microns in dimensions; and the mass of nickel hydroxide accounts for 50-95% of the composite material. The invention also provides a preparation method of the composite material. The three-dimensional nickel hydroxide-graphene composite material provided by the invention has high conductivity, excellent toxic resistance and high cycle stability, and is a very ideal positive electrode material of a zinc nickel battery, and can be widely applied to the fields of various kinds of portable electronic equipment, electric vehicles, aerospace and the like; and in addition, the composite material can be prepared from the low-cost raw materials through aprocess with high repetition, simple process and low time consumption, so that the composite material is applicable to industrial production.

Description

technical field [0001] The invention belongs to the field of battery materials, and in particular relates to a positive electrode material of a nickel-based battery, a preparation method and application thereof. Background technique [0002] With the increasing awareness of environmental protection, the research and development of new high-performance green secondary power batteries has become a major issue that needs to be solved urgently. Zinc-nickel battery is composed of zinc electrode and nickel electrode. It has the superior performance of zinc anode in zinc-silver battery and nickel anode long life in cadmium-nickel battery. It is a high-performance green secondary power battery. The performance characteristics of zinc-nickel secondary batteries include: high working voltage (higher than nickel-metal hydride batteries and nickel-cadmium batteries), high energy density (generally 2 times that of lead-acid batteries, 1.5 times that of nickel-cadmium batteries), high pow...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/52H01M4/62H01M10/30
CPCY02E60/10
Inventor 杨树斌丁军伟李彬
Owner BEIHANG UNIV
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