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a double modified sno 2 @c/ Preparation method of graphene nanocomposite negative electrode material

A nano-composite, double-modified technology, applied in the field of preparation of negative electrode materials, can solve the problems of poor cycle performance and lithium storage performance, and achieve the effects of fast reaction speed, small nanoscale, and excellent electrochemical lithium storage performance

Active Publication Date: 2017-11-21
HEILONGJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the SnO prepared by existing methods 2 When used with graphene composites as negative electrode materials, the cycle performance and lithium storage properties at high current densities are poor, and a double-modified SnO 2 Preparation method of @C / graphene nanocomposite negative electrode material

Method used

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  • a double modified sno <sub>2</sub> @c/ Preparation method of graphene nanocomposite negative electrode material
  • a double modified sno <sub>2</sub> @c/ Preparation method of graphene nanocomposite negative electrode material
  • a double modified sno <sub>2</sub> @c/ Preparation method of graphene nanocomposite negative electrode material

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specific Embodiment approach 1

[0028] Specific embodiment 1: This embodiment is a double modified SnO 2 The preparation method of @C / graphene nanocomposite negative electrode material is specifically completed according to the following steps:

[0029] 1. Preparation of nano-carbon spheres: put the glucose powder into deionized water, and stir it magnetically for 10 minutes to obtain an aqueous glucose solution; pour the glucose solution into a polytetrafluoroethylene reactor in a microwave reactor and seal it, at a temperature of 120- React at 200°C and a pressure of 10bar to 30bar for 0.5h to 3h, centrifuge to obtain a solid product, and wash the solid product with centrifugal water until the filtrate is clear after washing to obtain a washed solid product. Vacuum drying at a temperature of 80°C for 8 hours, and then grinding to obtain nano-carbon sphere powder;

[0030] The mass of the glucose powder described in step 1 and the volume ratio of deionized water are (2~8) g:30mL;

[0031] 2. Two-step meth...

specific Embodiment approach 2

[0038] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the volume ratio of the glucose powder described in step 1 to deionized water is 4g:30mL. Others are the same as the first embodiment.

specific Embodiment approach 3

[0039] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is: in step 1, react at a temperature of 180° C. and a pressure of 10 bar to 30 bar for 0.5 h to 3 h, and centrifuge to obtain a solid phase product. Others are the same as those in Embodiment 1 or 2.

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Abstract

The invention provides a preparation method of a double-modified SnO<2>@C / graphene nano composite anode material, relates to the preparation method of the anode material, and aims at solving the problems of poor cycle performance and lithium storage property of SnO<2> and graphene composite prepared by an existing method when used as the anode material at high current density. The preparation method comprises the following steps: (1) preparing nano carbon spheres; (2) preparing SnO<2>@C through a two-step method to obtain an SnO<2>@C composite material; and (3) carrying out microwave hydrothermal reaction to obtain SnO<2>@C / graphene composite material solid powder, namely double-modified SnO<2>@C / graphene nano composite anode material. The preparation method is mainly used for preparing the double-modified SnO<2>@C / graphene nano composite anode material.

Description

technical field [0001] The invention relates to a preparation method of negative electrode material. Background technique [0002] With the rapid development of social economy, the demand for energy in human society is getting higher and higher, and the energy supply and demand situation is becoming increasingly severe. Energy and environmental issues have become the focus of human society. The depletion of non-renewable energy, the pollution and greenhouse effect in the use process make us eager to seek clean and green energy. The emergence of chemical power sources has brought great convenience to human production and life, among which lithium-ion batteries, as a rookie in the field of electric power in modern society, are booming. In recent years, the application of lithium-ion batteries has gradually moved to the field of electric vehicles, and the rapid development of electric vehicles has put forward higher requirements for the performance of lithium-ion batteries. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M10/0525
CPCH01M4/364H01M10/0525Y02E60/10
Inventor 刘丽来吴大青解丽萍丁淑芳罗克洁张宏森
Owner HEILONGJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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