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Preparation method of tin dioxide/graphene negative electrode material

A graphene negative electrode, tin dioxide technology, applied in the field of lithium ion batteries, can solve the problems of rapid electrode capacity decay, limited metal oxide development, electrode pulverization, etc., and achieves good cycle performance, high specific capacity, and simple preparation process. Effect

Inactive Publication Date: 2017-10-24
宋进华
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

where SnO 2 The specific capacity is as high as 782 mAh / g, but the SnO 2 As an electrode material, the volume change is as high as 200 to 300% during charge and discharge, which will cause the pulverization of the electrode and lead to the disconnection of the active material and the current collector.
Therefore, most SnO 2 All electrodes have the problem of rapid capacity decay, which also limits the development and practical application of metal oxides as anode materials for lithium-ion batteries.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] (1) Dissolve 1 gram of graphene oxide powder in dimethylformamide (DMF) solution and disperse ultrasonically to form a dispersed graphene solution;

[0013] (2) Add 2 grams of tin tetrachloride pentahydrate into 50 ml of deionized water, and stir to form a tin chloride solution;

[0014] (3) Add tin chloride solution to the graphene solution during the ultrasonic process to obtain a mixed solution, and then magnetically stir the mixed solution for 1 hour, put it in an oven and heat it to 160°C, and keep it warm for 18 hours to obtain a precipitate;

[0015] (4) The precipitate was centrifuged with ethanol and deionized water, washed three times, and then dried at 60 °C to obtain a tin dioxide / graphene composite.

Embodiment 2

[0017] (1) Dissolve 3 grams of graphene oxide powder in dimethylformamide (DMF) solution, and disperse ultrasonically to form a dispersed graphene solution;

[0018] (2) Add 2 grams of tin tetrachloride pentahydrate into 50 ml of deionized water, and stir to form a tin chloride solution;

[0019] (3) Add tin chloride solution to the graphene solution during the ultrasonic process to obtain a mixed solution, and then magnetically stir the mixed solution for 2 hours, put it in an oven and heat it to 180°C, and keep it warm for 14 hours to obtain a precipitate;

[0020] (4) The precipitate was centrifuged with ethanol and deionized water, washed three times, and then dried at 60 °C to obtain a tin dioxide / graphene composite.

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PUM

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Abstract

The invention discloses a preparation method of a tin dioxide / graphene negative electrode material. The preparation method comprises the steps of performing ultrasonic dispersion on graphene dioxide powder to form a dispersed graphene solution; adding tin tetrachloride pentahydrate into deionized water to form a tin chloride solution; mixing the graphene solution and the tin chloride solution, magnetically stirring the mixed solution, placing the mixed solution in a drying oven for hydrothermal reaction, and obtaining a precipitant after reaction is completed; and centrifugally separating the precipitant by ethyl alcohol and the deionized water, performing drying under 60 DEG C after cleaning for three times, and obtaining the tin dioxide / graphene composite material. The preparation process is simple, strong acid, strong alkali or other toxic substances are not introduced, a green synthesis line is employed, and the prepared negative electrode material has favorable cycle property and is high in specific capacity.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a preparation method of a tin dioxide / graphene negative electrode material. Background technique [0002] Electrode materials are key to lithium-ion batteries. At present, the commercial lithium-ion battery anode material is mainly graphite, which is low in cost and widely available in sources, and is suitable for commercialization. However, SEI film will be formed after lithium intercalation in graphite, which will cause irreversible loss of initial capacity and lower capacity. With a capacity of only 372 mAh / g, the applications in fields requiring high energy output are limited. Moreover, the potential of the carbon negative electrode is very close to that of metal lithium, and metal lithium is easily precipitated on the surface of the carbon negative electrode to form lithium dendrites, resulting in a short circuit of the battery, which poses a certain safety ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/587H01M4/62H01M10/0525
CPCH01M4/362H01M4/483H01M4/587H01M4/625H01M10/0525Y02E60/10
Inventor 宋进华
Owner 宋进华