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Preparation method of silicon carbon composite material

A silicon-carbon composite material and nano-silicon technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of easy cracking and poor bonding, and achieve increased bonding strength, improved bonding, and good bonding. effect of action

Active Publication Date: 2019-03-15
SOUNDON NEW ENERGY TECH CO LTD
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Problems solved by technology

[0005] The object of the present invention is to provide a kind of preparation method of silicon-carbon composite material, to ease the gap between graphite and graphene-coated nano-silicon particles and between graphene and nano-silicon in the silicon-carbon composite material obtained by the existing preparation method. Poor binding force, prone to cracking technical problems during use

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  • Preparation method of silicon carbon composite material

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[0016] In one aspect, the present invention provides a method for preparing a silicon-carbon composite material, comprising the following steps:

[0017] S1) first add a silane coupling agent to the nano-silicon dispersion to react, then add graphene oxide to react, then add a dispersant, mix evenly to obtain a dispersion of graphene oxide-coated nano-silicon;

[0018] S2) In the state of shearing and stirring, spray the dispersion liquid of graphene oxide coated nano-silicon obtained in step S1) into the mixed powder of graphite and pitch I for shearing granulation to obtain precursor particles;

[0019] Wherein, the mass ratio of graphite, pitch I and nano silicon is 1:(0.03~0.1):(0.05~0.2);

[0020] S3) The precursor particles obtained in step S2) are dried and then sintered to reduce the graphene oxide in the precursor particles to graphene to obtain a silicon-carbon composite material.

[0021] In the preparation method of the silicon-carbon composite material provided b...

Embodiment 1

[0055] This embodiment is a method for preparing a silicon-carbon composite material, comprising the following steps:

[0056] S1) Add a silane coupling agent to the nano-silicon dispersion with a solid content of 30%, and stir and react at 50°C for 10h; add graphene oxide after the reaction is complete, and continue to stir and react at 50°C for 14h; the reaction is complete Finally, add a dispersant and stir evenly to obtain a dispersion of graphene oxide-coated nano-silicon;

[0057] S2) Graphite with a particle size of 0.5-5 μm and pitch I with a particle size of 0.5-3 μm are uniformly mixed according to a mass ratio of 1:0.08, and then added to a high-shear granulator; at the same time, the obtained The dispersion of graphene oxide-coated nano-silicon is sprayed into a high-shear granulator for shear granulation to obtain precursor particles;

[0058] Among them, the mass ratio of graphite and nano-silicon is 1:0.1; the shear speed is 2500r / min, the stirring speed is 700...

Embodiment 2

[0063] This embodiment is a method for preparing a silicon-carbon composite material, comprising the following steps:

[0064]S1) adding nano-silicon to the piranha lotion and reacting for 10 hours for pretreatment, wherein the mass ratio of the nano-silicon to the piranha lotion is 1:10; the pretreated nano-silicon has a solid content of 30 % dispersion liquid, add silane coupling agent, stir and react at 50°C for 10h; add graphene oxide after the reaction is completed, and continue to stir and react at 50°C for 14h; add dispersant after the reaction is completed, and stir evenly to prepare Obtain the dispersion liquid of graphene oxide coating nano-silicon;

[0065] S2) Graphite with a particle size of 0.5-5 μm and pitch I with a particle size of 0.5-3 μm are uniformly mixed according to a mass ratio of 1:0.08, and then added to a high-shear granulator; at the same time, the obtained The dispersion of graphene oxide-coated nano-silicon is sprayed into a high-shear granulato...

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Abstract

The invention provides a preparation method of a silicon carbon composite material, and relates to the field of new energy batteries. The preparation method of the silicon carbon composite material comprises the following steps of: S1) firstly adding a silane coupling agent to nano silicon dispersion solution for reaction, adding graphene oxide to carry out reaction, finally adding a dispersing agent, and uniformly mixing the components to obtain dispersion solution of graphene oxide-coated nano silicon; S2) under a shearing and stirring state, spraying the dispersion solution of the grapheneoxide-coated nano silicon into the mixed powder of graphite and asphalt I for shear granulation so as to obtain precursor particles, wherein the graphite, the asphalt I and the nano silicon have a mass ratio of 1: (0.03-0.1): (0.05 to 0.2); and S3) drying and sintering the precursor particles obtained in the step S2) to ensure that the graphene oxide in the precursor particles are reduced to graphene, so as to obtain the silicon carbon composite material.

Description

technical field [0001] The invention relates to the field of new energy batteries, in particular to a method for preparing a silicon-carbon composite material. Background technique [0002] Lithium-ion batteries have been widely used in portable consumer electronics, power tools, medical electronics and other fields due to their advantages such as high energy density, long cycle life, no memory effect, low self-discharge efficiency, and wide operating temperature range. At the same time, It also shows good application prospects in the fields of pure electric vehicles, hybrid vehicles and energy storage. [0003] However, in recent years, the requirements for battery energy density in various fields have increased rapidly, and there is an urgent need to develop lithium-ion batteries with higher energy density. Since silicon can form a binary alloy with lithium and has a theoretical capacity close to 4200mAh / g, it has attracted much attention. In addition, silicon also has a...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/62
CPCH01M4/386H01M4/625Y02E60/10
Inventor 马锐苗立孝
Owner SOUNDON NEW ENERGY TECH CO LTD
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