A silicon-carbon composite material, a preparation method thereof and a lithium ion battery

A silicon-carbon composite material, lithium-ion battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as insufficient conductivity and incomplete coating, and achieve high initial efficiency, high mass specific capacity, and reduced The effect of ohmic polarization

Active Publication Date: 2019-01-15
HUBEI RT ADVANCED MATERIALS CO LTD
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the shortcomings of incomplete coating and insufficient conductivity of amorphous carbon in the coating process of the prior art, and to provide a silicon-carbon composite material and its preparation method and lithium-ion battery

Method used

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  • A silicon-carbon composite material, a preparation method thereof and a lithium ion battery
  • A silicon-carbon composite material, a preparation method thereof and a lithium ion battery

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preparation example Construction

[0026] The present invention also provides a method for preparing a silicon-carbon composite material, the method comprising the following steps:

[0027] (1) adding the base material to the ethanol mixture of nano-silicon, and uniformly dispersing to obtain a mixed solution;

[0028] (2) The mixed solution is spray-dried to obtain a precursor;

[0029] (3) Mix the precursor, carbon source and conductive agent, and then perform a calcination under the protection of nitrogen;

[0030] (4) Pulverize the primary sintered material obtained in step (3), then mix it with a carbon source and a conductive agent, perform secondary calcination under nitrogen protection, then pulverize it, and mix the pulverized material with graphite.

[0031] In the method of the present invention, in step (1), the matrix material can be selected from at least one of natural graphite, artificial graphite and mesocarbon microspheres.

[0032] In the method of the present invention, the particle size o...

preparation example 1

[0048] 1kg of crude silicon (Xuzhou Lingyun Silicon Industry Co., Ltd., average particle size 5 μm) is uniformly dispersed in 9kg of ethanol to obtain a mixed solution, and the obtained mixed solution is added to a nano sand mill. 2 Grinding for 8 hours under protection, wherein the mill speed is 1200 rpm, using 0.1 mm zirconium balls, to prepare nano-silicon slurry with an average particle size of 50 nm.

preparation example 2

[0050] 1 kg of asphalt particles (Jining Chenguang Coal Chemical Co., Ltd., softening point: 250°C) was coarsely pulverized by a mechanical pulverizer for 3 minutes (rotation speed: 15,000 rpm), and the obtained powder was finely pulverized by a jet pulverizer (inlet air pressure 0.8Mpa, pulverization pressure 0.7Mpa ), the average particle size of the asphalt powder obtained was 2.5 μm.

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Abstract

The invention relates to the field of electrochemistry and negative electrode material of lithium ion battery, and discloses a silicon-carbon composite material, a preparation method thereof and a lithium ion battery. The silicon-carbon composite material comprises a matrix material, nano-silicon loaded on the surface of the matrix material and a coating carbon layer coated on an outer layer, wherein the coating carbon layer comprises an amorphous carbon layer and a conductive agent dispersed in the amorphous carbon layer. The silicon-carbon composite material of the invention is used as the negative electrode active material of the lithium ion battery, and the prepared lithium electron battery has good first-time efficiency and cycle stability, and obviously good comprehensive performance.

Description

technical field [0001] The invention relates to the fields of electrochemistry and lithium-ion battery negative electrode materials, in particular to a silicon-carbon composite material, a preparation method thereof, and a lithium-ion battery. Background technique [0002] With the continuous evolution of the market and the increasing requirements of terminal enterprises on the energy density of lithium-ion batteries, the graphite-based anode materials mainly used in the market (theoretical specific capacity is only 372mAh / g) have reached the bottleneck for the improvement of the energy density of lithium-ion batteries. It is very difficult to realize the space to improve it. Silicon and lithium can form Li1 2 Si 7 , Li 7 Si 3 , Li1 3 Si 4 and Li 22 Si 5 Alloy, the theoretical specific capacity is as high as 4200mAh / g, and its discharge voltage is low, it is considered to be one of the most potential substitute materials for graphite anode. [0003] However, the sil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/587H01M4/62H01M10/0525
CPCH01M4/366H01M4/386H01M4/587H01M4/625H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 程光春孙杰许中柱林平均
Owner HUBEI RT ADVANCED MATERIALS CO LTD
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