SiOx based composite negative electrode material, preparation method and battery

A technology of negative electrode material and carbon material is applied in the field of new SiOx-based composite negative electrode material and its preparation, and the field of negative electrode material for lithium ion battery, which can solve the problems of large environmental pollution, poor material cycle performance, and difficult industrial application, and achieve dispersibility. Good results

Active Publication Date: 2014-03-19
BTR NEW MATERIAL GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although simple fusion is used in this invention, the SiO with microsphere structure x /C (D 50 =12±2μm) and graphite materials cannot form a coating structure due to point contact. The two are monodisperse, the bonding strength is low, and the material cycle performance is poor. At the same time, substances that are harmful to

Method used

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  • SiOx based composite negative electrode material, preparation method and battery
  • SiOx based composite negative electrode material, preparation method and battery
  • SiOx based composite negative electrode material, preparation method and battery

Examples

Experimental program
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Effect test

Embodiment 1

[0059] Ball mill SiO raw materials to silicon oxide particles with a median particle size of 0.1-5.0 μm, disperse them and phenolic resin in ethanol at a mass ratio of 90:10, and dry them; The flow rate is 2.0L / min, the temperature is raised to 1150.0°C at a heating rate of 1°C / min, the temperature is kept at a constant temperature for 0.5h, and it is naturally cooled to room temperature. μm, silicon oxide material with a carbon content of 0.5-5.0%;

[0060] Add the silicon oxide material prepared above and natural graphite powder with a carbon content of not less than 99.0% and a median particle size of 8.0 to 20.0 μm into the fusion machine at a mass ratio of 1:19, and fuse for 0.5 hours to obtain the precursor I material ;

[0061] Add the precursor I material and asphalt powder with a median particle size of 0.5-5.0 μm into the VC high-efficiency mixer at a mass ratio of 1:9, and mix and coat for 0.5 hours to obtain the precursor II material;

[0062] The precursor II ma...

Embodiment 2

[0064] SiO 1.5 The raw materials are ball-milled to silicon oxide particles with a median particle size of 0.1-2.0 μm, dispersed in ethanol with citric acid at a mass ratio of 70:30, and dried; then placed in a tunnel kiln under an argon protective gas environment, The flow rate is 10.0L / min, the temperature is raised to 500.0°C at a heating rate of 20.0°C / min, the temperature is kept at a constant temperature for 20.0h, and it is naturally cooled to room temperature, then crushed with a jet mill, and sieved with 325 mesh to obtain a median particle size of 1.0-10.0μm. Carbon content is 5.0-20.0% silicon oxide material;

[0065]Add the silicon oxide material prepared above and artificial graphite powder with a carbon content of not less than 99.0% and a median particle size of 8.0 to 20.0 μm into the fusion machine at a mass ratio of 1:3, and fuse for 3.0 hours to obtain the precursor I material ;

[0066] Add the precursor I material and glucose powder with a median particl...

Embodiment 3

[0069] SiO 0.5 The raw material is ball-milled to produce silicon oxide particles with a median particle size of 1.0-10.0 μm, and then the prepared silicon oxide particles and carbon content are not less than 99.0%, and the median particle size is 15.0-25.0 μm. The ratio of 1:99 is added to the fusion machine and fused for 10.0 hours to obtain the precursor I material;

[0070] Add the precursor I material and phenolic resin powder with a median particle size of 5.0-10.0 μm into the VC high-efficiency mixer at a mass ratio of 1:49, mix and coat for 1.0 h, and obtain the precursor II material;

[0071] Put the precursor II material in the tunnel kiln, under the nitrogen protection environment, the flow rate is 0.5L / min, the temperature is raised to 1150.0°C at a heating rate of 20.0°C / min, and the temperature is maintained for 0.5h, naturally cooled to room temperature, and then mechanical pulverizer Grinding and sieving with 200 meshes to obtain a composite negative electrode...

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Abstract

The invention relates to a high-capacity SiOx based composite negative electrode material, a preparation method and a battery, wherein the negative electrode material comprises a silicon oxide material, a carbon material and an amorphous carbon coating layer; the silicon oxide material is silicon oxide or silicon oxide material modified in a carbon coating manner; surfaces of carbon material particles are coated with the silicon oxide material. A preparation method of the high-capacity SiOx based composite negative electrode material comprises the steps of performing physical processing or carbon coating modification on a silicon oxide raw material, thus obtaining a micron-sized silicon oxide material; and then mechanically fusing, coating with a solid phase and sintering at a high temperature to obtain the high-capacity negative electrode material. Through the high-capacity SiOx based composite negative electrode material, the effect of uniform dispersing and coating of the micron-sized silicon oxide particles on the surfaces of the carbon material particles can be achieved by virtue of the combination of mechanical fusion and solid-phase coating processes. The silicon oxide particles are well dispersed on the surface of the carbon material particle; the strength of bonding between the silicon oxide particles and the carbon material particles is high; the recycling performance of the material can be greatly improved; and meanwhile, the high-capacity SiOx based composite negative electrode material is high in first efficiency (breaking through the theoretical efficiency of SiOx), low in expansion rate, long in service life, environmental-friendly, pollution-free and low in cost.

Description

technical field [0001] The invention relates to the field of negative electrode materials for lithium ion batteries, in particular, the invention relates to a novel SiOx-based composite negative electrode material, a preparation method thereof, and a lithium ion battery using the negative electrode material. Background technique [0002] Lithium-ion batteries prepared in the prior art mainly use graphite-like carbon materials as negative electrode active materials, such as: artificial graphite, natural graphite, mesophase carbon microspheres, and the like. However, after more than 20 years of material self-modification, such as multi-phase coating, doping, etc., this type of carbon negative electrode material has been optimized for battery technology, and its actual use capacity is close to the theoretical specific capacity of the material (372mAh / g). The compacted density is less than 1.8g / cm 3 , so that its volume energy density has reached a certain limit, and it is diff...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M10/0525
CPCY02E60/122H01M4/366H01M4/483H01M4/583H01M10/0525Y02E60/10H01M4/139H01M4/48H01M4/485H01M4/587H01M10/052
Inventor 岳敏余德馨李胜任建国
Owner BTR NEW MATERIAL GRP CO LTD
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