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Silicon-carbon composite material, preparation method and application thereof

A technology of silicon-carbon composite materials and composite materials, which is applied in the direction of electrical components, electrochemical generators, battery electrodes, etc., can solve the problems of silicon expansion, poor material cycle performance, and serious silicon agglomeration, etc., to improve electrical conductivity , stable charging and discharging speed, uniform path length

Pending Publication Date: 2021-10-01
济南精智方正新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The nano-silicon prepared by etching in this invention has a large specific surface area, and it is difficult to obtain uniform dispersion on the graphite surface, so that the silicon-carbon material prepared by this method has serious silicon agglomeration, which cannot solve the problem of silicon expansion, resulting in poor cycle performance of the material.

Method used

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  • Silicon-carbon composite material, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Get 100g microspherical phenolic resin-based activated carbon (its source is: Jinan Jingzhi Founder New Material Co., Ltd. PF-7001, D50=3 micron, specific surface area 600m 2 / g, the macropore content is less than 5%, the mesopore volume content is 11%, and the sphericity is 0.8. Put it into a rotary furnace, and heat it up to 500 °C at a rate of 5 °C / min under the protection of 1.0 L / min high-purity nitrogen. After holding for 2 hours, switch high-purity nitrogen to high-purity SiH 4 The gas was kept at a flow rate of 2 L / min for 1 hour, then switched back to high-purity nitrogen protection, and naturally cooled to room temperature to prepare 105 g of silicon-carbon composite microspheres.

Embodiment 2

[0049] Get 100g microspherical phenolic resin-based activated carbon (its source is: Jinan Jingzhi Founder New Material Co., Ltd. PF-7001, D50=3 micron, specific surface area 1800m 2 / g, the mesopore volume content is 20%, the macropore volume content is less than 5%, and the sphericity is 0.8. Put it into a rotary furnace, and heat it up to 500 °C at a rate of 5 °C / min under the protection of 1.0 L / min high-purity nitrogen. After holding for 2 hours, switch high-purity nitrogen to high-purity SiH 4 The gas was kept at a flow rate of 2 L / min for 2 hours, then switched to high-purity nitrogen protection, and naturally cooled to room temperature to prepare 112 g of silicon-carbon composite microspheres.

Embodiment 3

[0051] Get 100g microspherical phenolic resin-based activated carbon (its source is: Jinan Jingzhi Founder New Material Co., Ltd. PF-7001, D50=3 micron, specific surface area 1940m 2 / g, the mesopore volume content is 26%, the macropore volume content is less than 5%, and the sphericity is 0.8) is put into the rotary furnace, under the protection of 1.0L / min high-purity nitrogen, the temperature is raised to 500°C at a speed of 5°C / min, After holding for 2 hours, switch high-purity nitrogen to high-purity SiH 4 The gas was kept at a flow rate of 2 L / min for 3 hours, then switched to high-purity nitrogen protection, and naturally cooled to room temperature to prepare 124 g of silicon-carbon composite microspheres.

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Abstract

The invention discloses a silicon-carbon composite material, a preparation method and application thereof, wherein the composite material comprises activated carbon and silicon particles deposited in pores and on the outer surface of the activated carbon. In a charging process of a secondary battery, when silicon particles deposited in the pores of activated carbon expand, enough space exists around to accommodate the expanded silicon particles, so that the change of the electrode thickness caused by silicon expansion or shrinkage is greatly inhibited, and the occurrence of electrode degradation problems such as negative electrode material falling and the like is reduced.

Description

technical field [0001] The invention belongs to the field of negative electrode materials for lithium ion secondary batteries, and in particular relates to a silicon-carbon composite material, a preparation method thereof, and an application in negative electrode materials for lithium ion secondary batteries. Background technique [0002] Due to the characteristics of high energy storage ratio, high safety, low cost, and easy mass production, lithium-ion secondary batteries have been widely used as power sources for smart phones, electric vehicles, and energy storage systems. At present, the anode material of industrialized lithium-ion secondary batteries is mainly made of graphite. In recent years, with extensive research on secondary batteries, the energy storage capacity of lithium-ion secondary batteries with graphite as the main anode material has been greatly improved. promote. The theoretical energy storage ratio of graphite is 372mAh / g. Although the existing battery...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525H01M10/054
CPCH01M4/362H01M4/386H01M4/625H01M4/628H01M10/0525H01M10/054Y02E60/10
Inventor 唐圳源
Owner 济南精智方正新材料有限公司
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