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Preparation method of tin oxide-graphene composite carbon film

A graphene composite and tin oxide technology, applied in electrochemical generators, electrical components, battery electrodes, etc., can solve the problems of many steps and complicated operations, and achieve the effects of simple operation, simple preparation method, and reduced production costs

Active Publication Date: 2014-07-02
ENERGY RES INST OF SHANDONG ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, the methods for preparing graphene-tin oxide composite materials mainly include in-situ chemical preparation, reassembly method (two-step method), gas-liquid interface synthesis, and hydrothermal and solvothermal methods. These methods often have many steps and complex operations. It is necessary to develop a new method that is easy to operate

Method used

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  • Preparation method of tin oxide-graphene composite carbon film
  • Preparation method of tin oxide-graphene composite carbon film

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Embodiment 1 prepares tin oxide-graphene composite carbon film

[0020] Take golden yellow 5mg ml -1 Add 20ml of GO aqueous dispersion (graphene oxide aqueous dispersion) to 200ml ethylene glycol, ultrasonically disperse for 30min, add 60mg tin tetrachloride powder and 3mg PVP (Mw=55000) and stir until completely dissolved, put Put it in the microwave and heat it for 150s. Cool, filter with suction, wash with distilled water three times, dry in a vacuum oven at 70°C for 10 hours, and then heat-treat at 550°C in an argon atmosphere for 3 hours to obtain a tin oxide-graphene composite carbon film, as shown in the photo figure 1 As shown, the charge-discharge cycle performance is as figure 2 shown by figure 2 It can be seen that the capacity can reach 650mAhg when the material is cycled 100 times -1 , the Coulombic efficiency (except for the first cycle) is higher than 97%, and can be directly used as the negative electrode of lithium-ion batteries.

Embodiment 2

[0021] Embodiment 2 prepares tin oxide-graphene composite carbon film

[0022] Take golden yellow 8mg ml -1 Add 12ml of the GO aqueous dispersion to 150ml ethylene glycol solution, ultrasonicate for 45min to disperse evenly, add 50mg of stannous chloride powder and 5mg of PVP (Mw=55000) and stir until completely dissolved, then heat in a microwave oven for 120s. Cool, filter with suction, wash with distilled water three times, dry in a vacuum oven at 70°C for 10 hours, and then heat-treat at 550°C for 3 hours in an argon atmosphere to obtain a tin oxide-graphene composite carbon film.

Embodiment 3

[0023] Embodiment 3 prepares tin oxide-graphene composite carbon film

[0024] Take golden yellow 10mg ml -1 Add 10ml of the GO aqueous dispersion into 100ml ethylene glycol solution, ultrasonicate for 30min to disperse evenly, add 80mg of stannous sulfate powder and 12mg of PVP (Mw=55000) and stir until completely dissolved, then heat in a microwave oven for 100s. Cool, filter with suction, wash with distilled water three times, dry in a vacuum oven at 70°C for 10 hours, and then heat-treat at 550°C for 3 hours in an argon atmosphere to obtain a tin oxide-graphene composite carbon film.

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Abstract

The invention discloses a preparation method of a tin oxide-graphene composite carbon film. The method comprises the steps of feeding ethylene glycol into graphene oxide water dispersion solution, evenly dispersing in an ultrasonic way, feeding a tin source and PVP, dissolving by stirring, and carrying out microwave heating; after reaction, cooling to the room temperature, carrying out suction filtration, washing by distilled water, and carrying out vacuum drying; and carrying out heat treatment to obtain the composite carbon film. In the reaction system, ethylene glycol is taken as not only a solvent but also a reducing agent, and the reduction products, namely oxalic acid and PVP, have the function of stabilizing the sizes of nano particles; a microwave way is used for heating, so that the temperature of the system is increased rapidly, and tin oxide particles with small sizes can be easily prepared; before the reaction, tin source ions are evenly absorbed on the surface of graphene oxide, so that the tin oxide particles in the product can be evenly distributed, oxidation hydrolysis of the tin source and the reduction of graphene oxide can be realized synchronously, and the components can be controlled. The prepared material is stable in structure, and can be directly used as an electrode for assembling a lithium ion battery after being simply cut.

Description

technical field [0001] The invention relates to a preparation method of a tin oxide-graphene composite carbon film that can be directly used as a negative electrode of a lithium ion battery. Background technique [0002] Lithium-ion batteries have been widely used in small portable devices because of their environmental protection, light weight, high capacity, and long life. The anode materials of lithium-ion batteries are mostly graphite-based carbon materials, and the rate performance of graphite-based materials is poor, so the application of lithium-ion batteries in the field of electric vehicles and hybrid vehicles is greatly restricted. The theoretical capacity of graphite materials is limited (372mAhg -1 ), solvent co-intercalation may also occur during lithium intercalation, which brings safety hazards. Therefore, the development of new lithium-ion battery anode materials has important theoretical significance and application prospects. The theoretical capacity of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48H01M4/62
CPCH01M4/366H01M4/483H01M4/587H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 谭春晖蔡飞鹏蒋波胡素琴杨改
Owner ENERGY RES INST OF SHANDONG ACAD OF SCI
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