Silicon monoxide/carbon composite material and preparation method and application thereof

A technology of carbon composite materials and silicon oxide, which is applied in the direction of electrochemical generators, active material electrodes, electrical components, etc., can solve the problems of uneven thickness of carbon layer, increase of material cost, exposed particle interface, etc., and achieve improved coating The effect of uniformity, improved contact, and reduced coating time

Active Publication Date: 2020-11-06
SHAANXI COAL & CHEM TECH INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Vapor deposition uses a rotary kiln as the coating equipment. There are usually parallel and spiral baffles in the inner tank. During the vapor deposition process, the baffles will continuously bring the material into contact with pyrolytic carbon to achieve the effect of carbon coating. , if the fluidity of the raw material is poor, there will be material stagnation at the edge of the baffle, resulting in the defect that the particle interface is exposed and the thickness of the carbon layer is uneven after gas phase coating. It takes a long coating time to reach a carbon content of about 5%, which increases the cost of materials

Method used

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  • Silicon monoxide/carbon composite material and preparation method and application thereof
  • Silicon monoxide/carbon composite material and preparation method and application thereof
  • Silicon monoxide/carbon composite material and preparation method and application thereof

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preparation example Construction

[0030] A kind of preparation method of pre-lithiated silicon oxide / carbon composite material of the present invention, comprises the following steps:

[0031] S1. Mix silicon oxide and modifier evenly, put it into a rotary crucible, heat to a certain temperature, and keep it warm for a period of time.

[0032] S2. Put the above-mentioned obtained materials into a rotary kiln, raise the temperature to a certain temperature and keep it warm, feed a certain amount of pyrolysis gas, and carry out carbon coating to obtain a silicon oxide / carbon composite material.

[0033] Preferably, the mass ratio of silicon oxide to modifier in step S1 is 1-0.01;

[0034] Preferably, the modifying agent in the step S1 is chemical paraffin, polyethylene with molecular weight less than 10,000, animal and vegetable wax, higher fatty acid, glyceryl tristearate or hardened oil.

[0035] Preferably, the method of mixing materials in the step S1 is ball milling, VC mixing or stirring;

[0036] Prefer...

Embodiment 1

[0044] A preparation and application of a silicon oxide / carbon composite material, comprising the following steps:

[0045] 1) Weigh 100g of SiO and 10g of chemical paraffin (100 mesh) in a ball milling tank at a speed of 400rpm / min, and the ball milling time is 2h to ensure uniform mixing. Put the evenly mixed materials into the rotary pot at a speed of 5rpm, under nitrogen protection The temperature was raised from room temperature to 60 °C at a rate of 3 °C / min, the rotation speed was adjusted to 15 rpm, and the temperature was kept for 3 hours. After cooling to room temperature, the materials were taken out.

[0046] 2) Put the material obtained in step 1) into a rotary kiln, raise the temperature to 800° C., feed acetylene gas, and keep it warm for 1 hour to obtain a silicon oxide / carbon composite material.

Embodiment 2

[0048] Compared with Example 1, no paraffin is added in Step 1, and all other step parameters remain unchanged.

[0049] from figure 1 with figure 2 It is not difficult to see from the figure that during the vapor deposition process of silicon oxide that has not been modified, there are exposed parts on the surface, and the coating of the carbon layer is not very uniform, but after the modification treatment, the uniformity of the coating is significantly improved.

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Abstract

The invention discloses a silicon monoxide/carbon composite negative electrode material and a preparation method and application thereof. The preparation method comprises the following steps: puttingsilicon monoxide and a modifier into a rotary crucible, heating to a certain temperature, carrying out heat preservation for a period of time to enable the modifier to fully coat the surface of silicon monoxide, and then carrying out vapor deposition carbon layer coating on the modified silicon monoxide to obtain the silicon monoxide/carbon composite negative electrode material. Through surface modification, the flowability of the silicon monoxide can be effectively improved. In the vapor deposition process, the contact between the material and pyrolysis gas can be effectively improved, the coated carbon layer is more uniform. Meanwhile, the electrochemical performance of the negative electrode material is greatly improved by modifying the surface of the silicon monoxide and further coating the silicon monoxide with the pyrolysis carbon layer, and the actual application of the silicon monoxide negative electrode material is facilitated.

Description

technical field [0001] The invention relates to the technical field of silicon oxide materials, in particular to a silicon oxide / carbon composite material and its preparation method and application. Background technique [0002] Graphite is a cheap and stable battery anode material, and it is currently the most widely commercialized anode material. However, the theoretical specific capacity of graphite is only 372mAh / g. In recent years, the capacity of commercial graphite has reached 355-360mAh / g, which is close to its theoretical specific capacity. It is difficult to have more room for improvement, especially with the development of electric vehicles. With vigorous development, batteries with graphite as the negative electrode have been difficult to meet people's battery life requirements. Silicon-based anode materials have attracted extensive attention due to their high capacity. [0003] Silicon oxide is one of the silicon-based negative electrode materials. Compared wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/62H01M10/0525
CPCH01M4/386H01M4/625H01M10/0525H01M2004/027Y02E60/10
Inventor 薛孟尧胥鑫曹国林曹新龙田占元宋骞
Owner SHAANXI COAL & CHEM TECH INST
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