A kind of ultrafine nano-silicon/carbon composite material and its preparation method and application

A carbon composite material, ultra-fine nanotechnology, applied in the direction of active material electrodes, structural parts, electrical components, etc., can solve the problems of uneven dispersion and easy agglomeration of nano-silicon-based particles and carbon-based materials, and improve cycle stability , avoid agglomeration, and ensure the effect of compound effect

Active Publication Date: 2022-03-08
SHAANXI COAL & CHEM TECH INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention solves the problem of uneven dispersion and easy agglomeration of nano-silicon-based particles and carbon-based materials in the preparation process of silicon-carbon composite materials, can effectively reduce the material expansion of the obtained ultrafine nano-silicon / carbon composite materials, and improve its cycle stability

Method used

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  • A kind of ultrafine nano-silicon/carbon composite material and its preparation method and application
  • A kind of ultrafine nano-silicon/carbon composite material and its preparation method and application

Examples

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preparation example Construction

[0030] Preferably, wherein the preparation method of ultrafine nano-silicon-based slurry comprises the following steps:

[0031] Step S1, using electron beam evaporation technology to prepare a periodic laminated film of nano-Si or SiOx / organic polymer, and finally reach a certain thickness;

[0032] Step S2, put the silicon-based material / organic polymer periodic laminated film with the substrate into alcohol, and use 1-2kW ultrasonic treatment for 10-20 minutes to perform ultrasonic crushing, so that the silicon-based material / organic polymer periodic laminated film The film is peeled off from the substrate and dispersed in alcohol to obtain the primary slurry of silicon-based materials;

[0033]Step S3, adding a certain amount of alcohol to the silicon-based material slurry after ultrasonication, adjusting the grinding slurry with a solid content of 5% to 8%, performing wet grinding for 1 to 2 hours, and grinding to a certain particle size, that is Obtain silicon-based slu...

Embodiment 1

[0041] Step S1, using electron beam evaporation technology to prepare a periodic laminated film of Si / organic polymer, wherein the silicon evaporation source uses intrinsic silicon particles with a purity of 3N or more, and the release layer of the organic polymer uses polyvinyl alcohol as the evaporation material, nanometer The thickness of Si is 30nm, the thickness of the organic release layer is 20nm, and a laminated coating material with a thickness of up to 40 μm is formed by alternate coating.

[0042] Step S2, put the coating material with the substrate into alcohol, and perform ultrasonic crushing, the ultrasonic power is 1kW, and the time is 10min;

[0043] Step S3, adding alcohol to the ultrasonicated slurry, adjusting the solid content to 5%, performing wet grinding for 1 hour, and grinding until the D50 of the ultrafine nano-silicon-based material contained therein is 40nm, to obtain an ultra-fine nano-silicon-based slurry ;

[0044] Step S4, adding 30% of high-te...

Embodiment 2

[0048] Step S1, using electron beam evaporation technology to prepare a periodic laminated film of SiOx / organic polymer release layer, wherein the evaporation material is SiO, the release layer of the organic polymer uses polyvinyl alcohol as the evaporation material, the thickness of nano-SiOx is 60nm, organic The thickness of the release layer is 20nm, and a laminated coating material with a thickness of up to 100 μm is formed by alternate coating.

[0049] Step S2, put the coating material with the substrate into alcohol, and perform ultrasonic crushing, the ultrasonic power is 1kW, and the time is 10min;

[0050] Step S3, adding alcohol to the ultrasonicated slurry, adjusting the solid content to 5%, and performing wet grinding until the D50 of the ultrafine nano-silicon-based material contained therein is 70nm to obtain an ultra-fine nano-silicon-based slurry;

[0051] Step S4, adding 30% high-temperature petroleum pitch and 17% PVP to the ultrafine nano-silicon-based slu...

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Abstract

The invention discloses an ultrafine nano-silicon / carbon composite material, a preparation method and application thereof, and belongs to the technical field of lithium battery negative electrode material preparation. The present invention adopts the method of staged roasting to prepare ultrafine nanometer silicon / carbon composite material based on ultrafine nanometer silicon-based slurry, high-temperature petroleum pitch and polyvinylpyrrolidone, and the material has excellent electrical properties. Beam evaporation combined with crushing process to prepare ultrafine nano-silicon-based slurry. The present invention solves the problem of nano-silicon-based materials such as nano-Si and nano-SiOx having too large a particle size, difficulty in controlling oxidation, and uneven dispersion during the preparation process of ultra-fine nano-silicon / carbon composite materials. The silicon / carbon composite material has low expansion and high cycle stability, so it can be used as a silicon-based composite negative electrode material for batteries.

Description

technical field [0001] The invention belongs to the technical field of lithium battery negative electrode material preparation, and in particular relates to an ultrafine nanometer silicon / carbon composite material and a preparation method and application thereof. Background technique [0002] With the development of new energy lithium battery technology, high requirements are placed on the energy density of lithium batteries. Focusing on the improvement of energy density, the current development direction mainly includes two. On the one hand, improve the battery pack structure, such as BYD's blade battery and CATL's CPT. On the other hand, seek breakthroughs in the battery material system and study materials with higher gram capacity. Positive and negative electrode materials are the key to improving the energy density of lithium-ion batteries. Although the positive electrode material occupies the core position in the battery, the theoretical gram capacity of the matching g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M4/62H01M10/052
CPCH01M4/366H01M4/364H01M4/386H01M4/483H01M4/625H01M4/628H01M10/052H01M2004/021H01M2004/027Y02E60/10
Inventor 魏立帅曹新龙王夏阳杨时峰张长安田占元
Owner SHAANXI COAL & CHEM TECH INST
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