Silicon-carbon composite material, preparation method thereof, negative electrode, power battery and electric automobile

A silicon-carbon composite material and nano-carbon material technology, applied in the field of materials, can solve the problems of excessive capacity decay, high volume expansion rate, poor electrical conductivity, etc.

Inactive Publication Date: 2019-08-20
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the problem facing silicon as the negative electrode material of power batteries is that the volume expansion rate of silicon is as high as 300% during the charging and dischargi

Method used

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  • Silicon-carbon composite material, preparation method thereof, negative electrode, power battery and electric automobile
  • Silicon-carbon composite material, preparation method thereof, negative electrode, power battery and electric automobile
  • Silicon-carbon composite material, preparation method thereof, negative electrode, power battery and electric automobile

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Experimental program
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Effect test

Embodiment 1

[0074] The graphene oxide aqueous solution with a mass percentage content of 1.34% was prepared into 1L of graphene oxide aqueous solution with a mass concentration of 1mg / mL, and the obtained mixture was stirred and dispersed for 1h at a stirring rate of 300rpm / min, and then added to the obtained mixture 83.34 g of a dispersion of carbon nanotubes with a mass percentage of 0.2% was added to the mixture, stirred and dispersed for 1 hour at a stirring rate of 400 rpm / min, and the first dispersion was obtained. Weigh 7g of polyvinylpyrrolidone and dissolve it in 500mL of deionized water, then weigh 1g of silicon nanoparticles (30nm in particle size) and add it to the solution formed by polyvinylpyrrolidone, ultrasonically stir for 1h, and the stirring rate is 220rpm / min , to obtain the second dispersion. The aforementioned first dispersion liquid was stirred at a rotational speed of 330 rpm / min, and the second dispersion liquid was added dropwise into the first dispersion liquid...

Embodiment 2

[0082]The graphene oxide aqueous solution with a mass percentage content of 1.34% was prepared into 1L of graphene oxide aqueous solution with a mass concentration of 1mg / mL, and the obtained mixture was stirred and dispersed for 1h at a stirring rate of 300rpm / min, and then added to the obtained mixture 41.67 g of a dispersion of carbon nanotubes with a mass percentage of 0.2% was added to the mixture, stirred and dispersed for 1 hour at a stirring rate of 400 rpm / min, and the first dispersion was obtained. Weigh 7g of polyvinylpyrrolidone and dissolve it in 500mL of deionized water, then weigh 1g of silicon nanoparticles (30nm in particle size) and add it to the solution formed by polyvinylpyrrolidone, ultrasonically stir for 1h, and the stirring rate is 220rpm / min , to obtain the second dispersion. The aforementioned first dispersion liquid was stirred at a rotational speed of 330 rpm / min, and the second dispersion liquid was added dropwise into the first dispersion liquid ...

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Abstract

The invention provides a silicon-carbon composite material, a preparation method thereof, a negative electrode, a power battery and an electric automobile. The silicon-carbon composite material comprises a housing layer, core-shell microspheres and a second nano-carbon material, wherein the material of the housing layer includes a first nano-carbon material, and an accommodating space is defined inside the housing layer; each core-shell structure microsphere is located in the accommodating space and provided with a core and a shell layer, the shell layer coats the core, the core includes nano-silicon particles, and the shell layer includes amorphous carbon; and the second nano-carbon material is linear, one part of the second nano-carbon material is located in the accommodating space, andthe other part of the second nano-carbon material is arranged in the first nano-carbon material in a penetrating manner. The silicon-carbon composite material can be used as a negative electrode material of the power battery, has the advantages of good conductivity, high capacity, good rate performance, and is not easy to expand or be powdered, high in stability and good in cycle performance.

Description

technical field [0001] The invention relates to the field of material technology, in particular, to a silicon-carbon composite material and a preparation method thereof, a negative electrode, a power battery and an electric vehicle. Background technique [0002] In related technologies, silicon is used as a negative electrode material for power batteries, especially lithium-ion batteries, with a high theoretical specific capacity (4200mAh / g). Currently, the negative electrode materials for lithium-ion batteries used in the market are mainly graphite. With high energy density, the development of silicon anode materials for power batteries has become the focus of attention. However, the problem facing silicon as the negative electrode material of power batteries is that the volume expansion rate of silicon is as high as 300% during the charging and discharging process of the battery. The performance is poor, and the capacity fades too quickly. [0003] Therefore, the related...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M4/62H01M10/0525B60L53/53B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00B60L53/53H01M4/366H01M4/386H01M4/583H01M4/625H01M10/0525Y02E60/10Y02T10/70Y02T10/7072Y02T90/12
Inventor 王亚州郑军华
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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