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Monox/carbon composite material as well as preparation method and use thereof

A technology of carbon composite materials and silicon oxide, applied in electrochemical generators, electrical components, battery electrodes, etc., can solve the problems of large volume expansion effect, low initial Coulombic efficiency, poor cycle performance and rate charge and discharge performance, etc.

Inactive Publication Date: 2013-09-18
BTR NEW MATERIAL GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To improve the problems of silicon oxide material as the negative electrode material of lithium-ion batteries, such as poor cycle performance and rate charge-discharge performance, low first-time Coulombic efficiency, and large volume expansion effect

Method used

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  • Monox/carbon composite material as well as preparation method and use thereof
  • Monox/carbon composite material as well as preparation method and use thereof
  • Monox/carbon composite material as well as preparation method and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Metal silicon and silicon dioxide are mixed in a molar ratio of 1:1, and reacted at 1350°C under 100Pa to generate silicon oxide gas, which is cooled and precipitated at 900°C under a reduced pressure of 50Pa to obtain The blocky product is then pulverized with a planetary ball mill to obtain a powder with a particle size of 100-500 nm.

[0057] According to chemical analysis, the composition of this powder is SiO. Using a transmission electron microscope, it can be observed that silicon is dispersed in the amorphous silicon oxide structure at the atomic level / microcrystalline state. The silicon crystal size in the silicon oxide particles is 4nm.

[0058] Graphene powder is prepared according to the redox method example 1 disclosed in Chinese Patent Application No. 201110157325.7. The thickness of the graphene sheet is 0.4-5nm, the sheet width is 1-15μm; the specific surface area is 300m 2 / g.

[0059]Disperse the silicon oxide particles and graphene powder prepared ab...

Embodiment 2

[0064] Compared with Example 1, except that the raw materials of silicon oxide particles are different, the silicon oxide / carbon composite material is manufactured under the same process conditions.

[0065] Among them, the block product (expressed by the general formula of SiO) obtained in the above Example 1 is heat-treated at 1000°C in an argon inert environment to carry out disproportionation reaction, and then the product is pulverized with a planetary ball mill to obtain a particle size of 200 ~1000nm powder. A structure in which silicon is dispersed in amorphous silicon oxide in a microcrystalline state can be observed using a transmission electron microscope, and the size of silicon crystals in silicon oxide particles is 5 to 30 nm.

Embodiment 3

[0067] Compared with Example 1, except that the addition ratio of silicon oxide particles and graphene powder is 8:2, a silicon oxide / carbon composite material is produced under the same process conditions.

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Abstract

The invention relates to a monox / carbon composite material, comprising monox / graphene particles, organic matter pyrolysis carbon and graphite powder, wherein monox particles are adhered to the surface of a grapheme sheet; the organic matter pyrolysis carbon coats the monox / graphene particles, and then is compounded with graphite. The preparation method of the monox / carbon composite material comprises the steps of: mixing monox particles with graphene to obtain the monox / graphene particles; coating organic carbon by obtained monox / graphene particles, thereby obtaining the monox / graphene material coated by the organic matter pyrolysis carbon; and mixing the obtained monox / graphene material coated by the organic matter pyrolysis carbon with the graphite powder, so as to obtain the monox / carbon composite material. The monox / carbon composite material is used as a lithium ion battery cathode material. Thus, the monox / carbon composite material has the characteristics of high first charge and discharge efficiency, excellent cycle performance and power charge and discharge properties, and low volume expansion effect.

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 silicon oxide / carbon composite material and its preparation method and application. Background technique [0002] Commercial lithium-ion batteries mainly use graphite-like carbon materials as negative electrode active materials. However, due to its low specific capacity (372mAh / g), carbon-based anode materials cannot meet the miniaturization of electronic equipment and the high-power and high-capacity requirements of lithium-ion batteries for vehicles. Therefore, it is necessary to develop alternative carbon materials with high energy density, A new lithium-ion battery anode material with high safety performance and long cycle life. [0003] Traditional metal silicon is used as the negative electrode material of lithium-ion batteries, and its theoretical specific capacity can reach 4200mAh / g. However, the volume expa...

Claims

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Application Information

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IPC IPC(8): H01M4/48H01M4/62H01M10/0525
CPCY02E60/10
Inventor 岳敏余德馨李胜张少波任建国黄友元
Owner BTR NEW MATERIAL GRP CO LTD
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