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Graphene tightly coated SiO negative electrode material and preparation method thereof

A graphene-coated, negative-electrode material technology, applied to battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of low theoretical capacity and poor cycle performance of silicon-based raw materials for battery negative electrodes, and achieve low cost and increased combination Strength, the effect of simple preparation process

Inactive Publication Date: 2019-05-10
圣盟(廊坊)新材料研究院有限公司
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  • Summary
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AI Technical Summary

Problems solved by technology

[0005] The invention proposes a SiO negative electrode material capable of tightly covering graphene and its preparation method, which solves the problems of low theoretical capacity and poor cycle performance of silicon-based raw materials for battery negative electrodes in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A kind of preparation method that can realize graphene tightly wrapping SiO negative electrode material, comprises the following steps:

[0026] 1) Preparation of surface-modified graphene oxide solution: use natural flake graphite as raw material, first prepare graphite oxide by modified Hummers method, centrifuge at 1000-15000rpm for 2min and wash with water to obtain graphene oxide slurry, according to the volume ratio Disperse the graphene oxide slurry in water with a ratio of 1:12 and ultrasonically for 3 minutes at 80W power, centrifuge at 1000-12000rpm for 2 minutes to remove unexfoliated graphite to obtain a graphene oxide solution, and add surface active material to the graphene oxide solution. agent, and disperse uniformly by ultrasonication for 3 minutes at a power of 80W to obtain a surface-modified graphene oxide solution;

[0027] 2) Preparation of SiO dispersion: SiO powder was added into an organic solvent, and stirred at 1000 rpm for 3 min to obtain a u...

Embodiment 2

[0033] The order number of natural flake graphite is 500 orders, and other processes are with embodiment 1.

[0034] The prepared graphene-coated SiO composite material and the SiO material without graphene coating were made into electrode sheets, and then assembled into button cells for electrochemical performance testing. Compared with SiO materials without graphene coating, under the same test conditions, the capacity increased by 21%, and the cycle performance increased by 30%.

Embodiment 3

[0036] The concentration of the graphene oxide solution was 5 mg / mL, and other processes were the same as in Example 1.

[0037] The prepared graphene-coated SiO composite material and the SiO material without graphene coating were made into electrode sheets, and then assembled into button cells for electrochemical performance testing. Compared with SiO materials without graphene coating, under the same test conditions, the capacity increased by 26%, and the cycle performance improved by 38%.

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Abstract

The invention proposes a graphene tightly coated SiO negative electrode material and a preparation method thereof, and solves the problem in the prior art that the theoretical capacity of a battery negative electrode silicon-based raw material is low and the cycle performance is poor. The preparation method of the graphene tightly coated SiO negative electrode material comprises the following steps: step 1), preparation of a surface modified graphene oxide solution; step 2), preparation of an SiO dispersion; step 3), preparation of a graphene oxide coated SiO composite; and step 4), preparation of a graphene coated SiO composite. The method of the invention can completely realize the compact ultra-thin film coated SiO composite of graphene, and the method has the advantages of being simplein preparation process, low in cost, short in cycle and environmentally friendly, and can realize macro preparation.

Description

technical field [0001] The invention relates to the technical field of battery negative electrode materials, in particular to a negative electrode material capable of tightly covering graphene with SiO and a preparation method thereof. Background technique [0002] Lithium-ion batteries have many advantages, such as high energy density, long cycle life, and no memory effect. Due to these advantages, lithium-ion batteries have become ideal energy storage devices for portable electronic devices, power tools, and other fields. With the inclusion of lithium-ion batteries in the 2006-2020 medium- and long-term scientific and technological development plan outline, and the high emphasis on renewable energy and electric vehicles, higher energy density and other performance requirements for lithium-ion batteries have been put forward. Require. [0003] Lithium-ion batteries are mainly composed of a negative electrode, a positive electrode, an electrolyte, and a separator. At prese...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/583H01M10/0525
CPCY02E60/10
Inventor 杲连连赵金平王为军王晶
Owner 圣盟(廊坊)新材料研究院有限公司
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