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A preparation method of high-rate silicon-based composite material, negative electrode material and lithium battery

A technology of silicon-based composite material and negative electrode material, applied in the field of materials, can solve the problems of low initial efficiency of negative electrode material, large specific surface area of ​​material, complicated preparation method, etc., and achieves good cycle performance, excellent rate performance, and simple and easy preparation method. Effect

Inactive Publication Date: 2018-11-09
SHANGHAI PUTAILAI NEW ENERGY TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the preparation method in the above-mentioned patent is relatively cumbersome, and the specific surface area of ​​the obtained material is too large, which easily leads to the low first effect of the negative electrode material.

Method used

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  • A preparation method of high-rate silicon-based composite material, negative electrode material and lithium battery
  • A preparation method of high-rate silicon-based composite material, negative electrode material and lithium battery
  • A preparation method of high-rate silicon-based composite material, negative electrode material and lithium battery

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Embodiment 1

[0045] Embodiment 1 of the present invention provides a method for preparing a high-magnification silicon-based composite material. Such as figure 1 Shown, this preparation method comprises the steps:

[0046] Step 110, mixing the carbon raw material with a compound capable of reacting with carbon according to the mass ratio, and performing heat treatment at 600°C-1100°C;

[0047] Specifically, the particle size of the carbon raw material is 2 μm-40 μm, specifically including: graphite material and / or non-graphite material; wherein the non-graphite material includes: one of soft carbon, hard carbon, porous carbon or mesocarbon microspheres or Several combinations; the graphite material includes: one or more combinations of graphitized mesophase microspheres, natural graphite, modified natural graphite or artificial graphite;

[0048]The above-mentioned compounds that can react with carbon have a particle size of 20nm-2000nm, specifically including: one or more of metal compo...

Embodiment 2

[0065] This embodiment provides a specific method for preparing a high-magnification silicon-based composite material, including:

[0066] (1) uniformly mix metallurgical coke with an average particle size of 20 microns and iron oxide with an average particle size of 1 micron according to a mass ratio of 9:1, heat to 900° C., and keep the temperature for 2 hours;

[0067] (2) heat-treating the obtained material at 3000°C to obtain porous carbon;

[0068] (3) Heating metal silicon powder with a median particle size of 20 microns to 1500° C. under 10 Pa, and depositing it on porous carbon according to a mass ratio of 1:9;

[0069] (4) The obtained material was mixed with petroleum pitch at a mass ratio of 8:2 and then heat-treated at 850°C for 2 hours to obtain a high-magnification silicon-based composite material.

[0070] The prepared high-magnification silicon-based composite material and graphite A are uniformly mixed according to the mass ratio of 1:2 and used as the lithi...

Embodiment 3

[0077] This embodiment provides a specific method for preparing a high-magnification silicon-based composite material, including:

[0078] (1) Evenly mix phenolic resin pyrolytic carbon with an average particle size of 20 microns and copper oxide with an average particle size of 500 nm according to a mass ratio of 9:1, heat to 800° C., and keep warm for 2 hours;

[0079] (2) After stirring the obtained material in 10% dilute nitric acid for 8 hours, rinse repeatedly with pure water to obtain porous carbon;

[0080] (3) Metal silicon powder with a median particle size of 20 microns is heated to 1500° C. under 10 Pa, and deposited on porous carbon according to a mass ratio of 2:8;

[0081] (4) The obtained material was mixed with polyvinyl alcohol at a mass ratio of 8:2, and then heat-treated at 850° C. for 2 hours to obtain a high-magnification silicon-based composite material.

[0082] The obtained high-rate silicon-based composite material and soft carbon material were mixed...

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Abstract

The invention discloses a preparation method of a composite high-magnification silicon-based material, a cathode material and a lithium battery. The preparation method comprises the following steps: mixing a carbon raw material and a first compound according to a mass ratio, and carrying out the heat treatment, wherein the first compound is a compound capable of reacting with carbon; removing impurities in the heat-treated material to obtain porous carbon; uniformly attaching a silicon material on the inner surface and outer surface of the porous carbon according to a mass ratio; and coating the attached material with carbon to obtain the composite high-magnification silicon-based material, wherein in the composite high-magnification silicon-based material, the mass percent of the porous carbon is 10 to 90 percent, and the specific surface area is 10m<2> / g to 500m<2> / g; the mass percent of the silicon material is 1 to 60 percent; and the mass percent of the carbon coating layer is 20 to 80 percent.

Description

technical field [0001] The invention relates to the field of material technology, in particular to a preparation method of a high-rate silicon-based composite material, a negative electrode material and a lithium battery. Background technique [0002] The energy crisis and environmental problems in contemporary society are becoming more and more prominent, and new clean energy and energy storage have become a hot research topic. In this context, lithium-ion batteries have basically occupied the market of portable consumer electronics due to their high energy density, high power density, long life and environmental friendliness, and are widely used in electric vehicles, large-scale energy storage equipment, decentralized Mobile power and other fields have broad application prospects. [0003] However, with the increasing demand for high-energy power sources, there is an urgent need for lithium-ion batteries with high energy density, fast and high-power charging and dischargi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/587H01M4/134H01M10/0525
CPCH01M4/134H01M4/366H01M4/386H01M4/587H01M10/0525H01M2004/021Y02E60/10
Inventor 刘柏男罗飞陆浩褚赓李辉张志清刘芳冯苏宁李泓陈卫
Owner SHANGHAI PUTAILAI NEW ENERGY TECH CO LTD