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A kind of silicon/carbon nanotube/silicon oxycarbide composite material and its preparation method and application

A technology of carbon nanotubes and silicon oxycarbide, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve problems such as not very superior performance, and achieve improved conductive path, easy control, high The effect of gram capacity

Active Publication Date: 2020-06-12
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, there are many reports in the literature that the use of a single silicon carbide or silicon material is used in lithium-ion batteries. Due to the defects of each material, the performance is not very superior.

Method used

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  • A kind of silicon/carbon nanotube/silicon oxycarbide composite material and its preparation method and application
  • A kind of silicon/carbon nanotube/silicon oxycarbide composite material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Preparation of silicon / carbon nanotube / silicon oxycarbide composites:

[0027] (1) Weigh 9.2g of methyltrichlorosilane silicone resin emulsion into a beaker, add 0.5g of silicon nanoparticles (average particle diameter of 10nm) and 0.3g of single-walled carbon nanotubes (average diameter of 0.8nm, length 5μm ) into the emulsion in the beaker, and ultrasonically stirred for 30 minutes to obtain a mixed solution;

[0028] (2) Pour the above-mentioned mixed solution into a quartz crucible evenly, and thermally crack it at 1000° C. for 8 hours in an argon atmosphere to obtain silicon / carbon nanotube / silicon oxycarbide solid particles;

[0029] (3) Carry out ball milling to the solid particles obtained by pyrolysis, the ball milling speed is 1000r / min, ball milling 2 times, each lasting 10min, cooling 10min, obtaining silicon / carbon nanotube / silicon oxycarbide solid particles with uniform particle size;

Embodiment 2

[0031] Preparation of silicon / carbon nanotube / silicon oxycarbide composites:

[0032] (1) Weigh 9.1g of methyltrichlorosilane silicone resin emulsion into a beaker, add 0.8g of silicon nanoparticles (average particle diameter of 50nm) and 0.1g of multi-walled carbon nanotubes (average diameter of 8nm, length 100μm) Add it into the emulsion in a beaker, and stir it ultrasonically for 5 minutes to obtain a mixed solution.

[0033] (2) Pour the mixture obtained above evenly into a quartz crucible, and thermally crack it at 600° C. for 4 hours in a nitrogen atmosphere to obtain silicon / carbon nanotube / silicon oxycarbide solid particles.

[0034] (3) The solid particles obtained by pyrolysis were ball milled at a ball milling speed of 500r / min, ball milled 5 times for 30 minutes each time, and cooled for 30 minutes to obtain silicon / carbon nanotube / silicon oxycarbide solid particles with uniform particle size.

Embodiment 3

[0036] Preparation of silicon / carbon nanotube / silicon oxycarbide composites:

[0037] (1) Weigh 9.2g methyltrichlorosilane silicone resin emulsion into a beaker, add 0.5g silicon nanoparticles (average particle diameter is 100nm) and 0.3g single-walled carbon nanotubes (average diameter is 1nm, length 100μm) Add it into the emulsion in a beaker, and stir it ultrasonically for 10 minutes to obtain a mixed solution.

[0038] (2) Pour the mixture obtained above evenly into a quartz crucible, and thermally crack it at 800° C. for 5 hours in a nitrogen atmosphere to obtain silicon / carbon nanotube / silicon oxycarbide solid particles.

[0039] (3) The solid particles obtained by pyrolysis were ball milled at a ball milling speed of 600r / min for 3 times, each time lasting 15 minutes, and cooled for 15 minutes to obtain silicon / carbon nanotube / silicon oxycarbide solid particles with uniform particle size.

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Abstract

The invention discloses a silicon-carbon nanotube-carbon silicon oxide composite, a preparation method and application, and relates to the field of silicon-based composites. The composite comprises silicon nanoparticles, carbon nanotubes and carbon silicon oxide particles, the carbon nanotubes and the silicon nanoparticles are mixed in a dispersed mode to form a three-dimensional network conducting skeleton, and the three-dimensional network conducting skeleton is coated with the carbon silicon oxide particles. The preparation method comprises the steps that the silicon nanoparticles and the carbon nanotubes are added into organosilicon resin emulsion, and ultrasonic stirring is conducted to obtain mixed liquid; under the inert atmosphere condition, the mixed liquid is subjected to thermalcracking processing to obtain powder; the powder is subjected to ball milling, and then solid particles of the silicon-carbon nanotube-carbon silicon oxide composite are obtained. According to the composite structure obtained by coating the silicon nanoparticles and the carbon nanotubes with the carbon silicon oxide particles, the volume expansion effect of the silicon material is inhibited, andthe composite can be applied to the fields of catalyst carriers, physical and chemical power supplies, supercapacitors and the like.

Description

technical field [0001] The invention relates to the technical field of silicon-based composite materials, in particular to a silicon / carbon nanotube / silicon oxycarbide composite material and its preparation method and application. Background technique [0002] Silicon has the advantages of high gram capacity, low charge and discharge platform, and abundant resources, and has become one of the most potential lithium-ion battery anode materials. However, the problems of volume expansion and poor conductivity of silicon itself determine its characteristics of short life and poor cycle performance. Studies have shown that nanosizing it and compounding it with carbon materials is an effective means to improve the life of silicon materials and reduce costs. [0003] Silicon oxycarbide has attracted the interest of many researchers in the field of lithium-ion batteries due to its good charge-discharge capacity and cycle performance. The silicon oxygen carbon network structure is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525H01M4/88H01M4/90B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/364H01M4/366H01M4/386H01M4/625H01M4/628H01M4/8825H01M4/9016H01M4/9091H01M10/0525Y02E60/10Y02E60/50
Inventor 朱丽丽杨茂萍王辉
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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