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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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the characteristics and limited preparation methods of

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

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Example Embodiment

[0031] Example 1:

[0032] A three-dimensional nickel hydroxide-graphene composite material, which is prepared by 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 in 2100g of water, and then seal in a hydrothermal kettle, at 180±5℃, react 12 About hours; see the photo of the prepared gel figure 1 .

[0034] (2) The solid product obtained by freeze-drying is a three-dimensional nickel hydroxide-graphene composite material. The product is a sponge-like porous three-dimensional composite material, which forms a conductive network with micropores, mesopores and macropores.

[0035] The morphology of the obtained three-dimensional nickel hydroxide-graphene composite material was characterized. figure 2 The microscopic morphology of the material is shown, and it can be seen that the three-dimensional nickel hydroxide-graphene composite material consists of graphene with an average length of 1-...

Example Embodiment

[0042] Example 2

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

[0044] The three-dimensional nickel hydroxide-graphene composite material was made into a working electrode according to the same method as in Example 1, and the corresponding electrical performance test was performed. The results are as follows: When charging and discharging at 1C, the stable specific capacity is 200mAh / g; at the above rate When charging and discharging, the capacity can maintain more than 70% of the initial capacity after 500 repeated charging and discharging.

Example Embodiment

[0045] Example 3

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

[0047] The three-dimensional nickel hydroxide-graphene composite material was made into a working electrode according to the same method as in Example 1, and the corresponding electrical performance test was performed. The results are as follows: When charging and discharging at 1C, the stable specific capacity is 180mAh / g; at the above rate When charging and discharging, the capacity can maintain more than 60% of the initial capacity after 500 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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