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Graphene loaded mn3o4 nano hollow sphere composite material and preparation method thereof

A composite material and graphene technology, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve problems such as poor conductivity and obvious volume effect, and achieve low equipment requirements, low reaction temperature, The effect of mild reaction conditions

Inactive Publication Date: 2019-04-02
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] One of the purposes of the present invention is to aim at transition metal oxide Mn 3 o 4 The shortcomings of poor conductivity and obvious volume effect provide a graphene-loaded Mn 3 o 4 Nano Hollow Sphere Composite

Method used

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  • Graphene loaded mn3o4 nano hollow sphere composite material and preparation method thereof
  • Graphene loaded mn3o4 nano hollow sphere composite material and preparation method thereof
  • Graphene loaded mn3o4 nano hollow sphere composite material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Embodiment 1: Weigh 0.39 g MnCl 2 4H 2 O, 0.56 g of hexamethylenetetramine and 0.30 g of hexadecyltrimethylammonium bromide were dissolved in 20 ml of deionized water, and after stirring evenly, the reaction solution was transferred to a 50 ml hydrothermal kettle and heated at 70°C Insulate for 1 h, wait for the hydrothermal kettle to cool down to room temperature naturally, open the hydrothermal kettle, centrifuge and wash the product to neutrality, and the product obtained after drying is the hollow sphere structure Mn 3 o 4 nanomaterials.

Embodiment 2

[0022] Example 2: Weigh 0.015 g GNS, pulverize it with a high-speed disperser, ultrasonically disperse it in 10 ml deionized water, and then take 0.39 g MnCl 2 4H 2 O, 0.56 g of hexamethylenetetramine and 0.30 g of hexadecyltrimethylammonium bromide were dissolved in 10 ml of deionized water, and after uniform stirring, they were added dropwise to the above GNS dispersion, and the reaction solution was mixed Transfer to a 50ml hydrothermal kettle, keep it warm at 70°C for 3 hours, wait for the hydrothermal kettle to cool down to room temperature naturally, turn on the hydrothermal kettle, and centrifugally wash the product until it is neutral. After drying, the product obtained is GNS- mn 3 o 4 composite material.

Embodiment 3

[0023] Example 3: Weigh 0.015 g GNS, pulverize it with a high-speed disperser, ultrasonically disperse it in 10 ml deionized water, and then take 0.39 g MnCl 2 4H 2 O, 0.56 g of hexamethylenetetramine and 0.30 g of polyvinylpyrrolidone were dissolved in 10 ml of deionized water, stirred evenly and added dropwise to the above GNS dispersion liquid, and after stirring evenly, the reaction solution was transferred to 50 ml of hydrothermal In the kettle, keep warm at 70°C for 5 h, wait for the hydrothermal kettle to cool down to room temperature naturally, turn on the hydrothermal kettle, and wash the product by centrifugation to neutrality, and the product obtained after drying is GNS-Mn with hollow sphere structure. 3 o 4 composite material.

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Abstract

The invention relates to a graphene loaded Mn3O4 nano hollow sphere composite and a preparation method thereof. The composite is formed by loading graphene on the surface of the Mn3O4 nano hollow sphere, and is irregular in particle size which is about 0.2-2 [mu]m; the aperture of the Mn3O4 nano hollow sphere is 100-200 nm; the mass ratio of graphene to the Mn3O4 nano hollow sphere is 0.1-10. The graphene loaded Mn3O4 nano hollow sphere composite, namely GNS-Mn3O4, not only has larger specific surface area and can provide more lithium-embedding sites, but also can provide slow release space for deformation stress in the charge-discharge process, so as to achieve excellent lithium storage performance. In addition, the composite preparation process is short in reaction time, low in reaction temperature, mild in reaction condition, low in equipment requirement and suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to a manganese-based negative electrode material for a lithium ion battery and a preparation method thereof, in particular to a graphene-loaded Mn 3 o 4 Nano hollow sphere composite material and its preparation method. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, high output voltage, no memory effect, and no environmental pollution. It also has great application prospects in energy equipment. At present, the anode materials of commercialized lithium-ion batteries are mainly graphite-based materials. However, the theoretical specific capacity of graphite is only 372 mAh / g, and it also has safety problems, which cannot meet people's needs for a new generation of high-capacity lithium-ion batteries. . Therefore, the development of new anode materials with high specific capacity and good safety performance has gradually become a research hotspot. [0003] Compared with graphite m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/505H01M4/625H01M10/0525H01M2004/021Y02E60/10
Inventor 王勇孙炜伟余志强苏芸杨秦斯蔡昌
Owner SHANGHAI UNIV