A silicon matrix composite material for lithium ion battery and a preparation method thereof

A technology of lithium-ion batteries and silicon-carbon composite materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problem of low specific capacity of silicon-carbon negative electrode materials, low initial discharge efficiency, volume effect of silicon-carbon negative electrode materials and initial discharge Low efficiency and other issues, to achieve high capacity, solve the volume effect, and solve the effect of low first-time Coulombic efficiency

Active Publication Date: 2018-12-11
KAIFENG UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a method for preparing a silicon-carbon composite material for lithium-ion batteries. The silicon-carbon composite material prepared by the method has the characteristics of high cycle stability and high capacity, and can solve the problem of

Method used

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Embodiment Construction

[0008] It is a silicon-carbon composite material for lithium-ion batteries. Its structure is a core-shell structure. The core-shell structure includes a core and a shell covering the core; the core includes 70%-95% silicon, 4%- 20% titanium (Ti) and 5%-15% niobium (Nb), silicon is the inner layer of the core, titanium (Ti) and niobium (Nb) elements are dispersed on the surface of the inner layer; the shell layer is made of graphene and carbon nano The tube is composed of a mass ratio of 11%-42% to the inner core, and the above percentages are mass percentages.

[0009] Its preparation steps are as follows:

[0010] Step 1. Collect the waste silicon powder cut by the diamond wire, place it under an argon (Ar) atmosphere at a high temperature of 1000° C. for 8 hours, and obtain a powdery or massive solid;

[0011] Step 2, placing the product obtained in step 1 in a ball mill under the protection of an argon (Ar) atmosphere at 450 r / min for 4 hours, and using a magnet to remove ...

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Abstract

The invention relates to a silicon-carbon composite material for lithium ion battery and a preparation method thereof, which is characterized in that the structure of the silicon-carbon composite material is a core-shell like structure, and the core-shell like structure comprises a core and a shell layer wrapped outside the core; Core includes 70%-95% silicon, 4%-20% titanium (Ti) and 5%-15% niobium (Nb), silicon is the inner layer of the core, and titanium (Ti) and niobium (Nb) are dispersed on the surface of the inner layer; The shell consists of graphene and carbon nanotubes, and the mass ratio of the shell to the core is 11%-42% by mas; The roller rolling process was used in the preparation process. The material provided by the inventionhas the characteristics of high cycle stability and high capacity, and can solve the volume effect of silicon-carbon negative electrode material and the bottleneck problem of low initial discharge efficiency.

Description

technical field [0001] The invention belongs to the technical field of new energy materials, and relates to a negative electrode material of a lithium ion battery and a preparation method thereof, in particular to a silicon-carbon composite material for a lithium ion battery and a preparation method thereof. Background technique [0002] With the development of lithium-ion battery technology, the development requirements of high capacity and small volume are becoming more and more obvious. Therefore, it is imminent to develop new high capacity anode materials. Among many candidate materials, silicon material has attracted much attention because of its high specific capacity of 4200mAh / g. However, pure silicon materials have serious volume changes during the charging and discharging process of the battery, which leads to the pulverization and shedding of the pole pieces, and the loss of electrical contact between the electrode active material and the current collector (i.e. t...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/366H01M4/386H01M4/625H01M4/628H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 刘进王丽郝延蔚赵辉
Owner KAIFENG UNIV
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