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Graphene-silicon composite material, preparation method thereof, electrode material and battery

A technology of silicon composite materials and graphene materials, applied in the direction of negative electrodes, battery electrodes, secondary batteries, etc., can solve the problems of reduced cycle performance, electrode structure collapse, mechanical pulverization, etc., to improve structural stability, combine Tight and uniform, evenly distributed silicon carbon effect

Active Publication Date: 2019-08-09
内蒙古信敏惠纳米科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, during the charging and discharging process of lithium-ion batteries, repeated lithium ion intercalation will cause a huge volume expansion of silicon-based materials, and the volume expansion rate can even reach 300%, which will easily lead to the destruction of the structure of silicon-based materials and mechanical pulverization. Lead to the collapse of the electrode structure and peeling off of the electrode material, seriously reducing its cycle performance

Method used

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  • Graphene-silicon composite material, preparation method thereof, electrode material and battery
  • Graphene-silicon composite material, preparation method thereof, electrode material and battery
  • Graphene-silicon composite material, preparation method thereof, electrode material and battery

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Embodiment 1

[0039] Such as figure 1 and figure 2 Shown, the embodiment of the present invention provides a kind of preparation method of graphene-silicon composite material, the preparation method of this graphene-silicon composite material comprises:

[0040] Step S200: Mix the positively charged silicon-based material dispersion and the negatively charged graphene-based material dispersion, so that the positively charged silicon-based material dispersion contains the positively charged silicon-based material and the negatively charged silicon-based material. The negatively charged graphene-like material contained in the charged graphene-like material dispersion is assembled together under electrostatic action to obtain a graphene-silicon self-assembled material dispersion; optionally, the negatively charged graphene-like material dispersion Added to the dispersion of positively charged silicon materials, so that the two are mixed together; in this process, the dispersion of negatively...

Embodiment 2

[0074] An embodiment of the present invention provides a graphene-silicon composite material, which is prepared by the above-mentioned preparation method of the graphene-silicon composite material. It is found through experiments that the resistivity of the graphene-silicon composite material is 10Ω·cm-20mΩ·cm, and has relatively high conductivity.

[0075] Compared with the prior art, the beneficial effect of the graphene-silicon composite material provided by the embodiment of the present invention is the same as that of the above-mentioned preparation method of the graphene-silicon composite material, and will not be repeated here.

[0076]In some practicable ways, considering that there are relatively few amination reagents reacting with nano-silicon and organic carboxylation reagents reacting with graphene, after the graphene-silicon self-assembled material is sintered in an inert environment, the obtained graphene - The mass percentage of the silicon-based material conta...

Embodiment 3

[0078] An embodiment of the present invention provides an electrode material, which includes the above-mentioned graphene-silicon composite material.

[0079] Compared with the prior art, the beneficial effect of the electrode material provided by the embodiment of the present invention is the same as that of the above-mentioned method for preparing the graphene-silicon composite material, and will not be repeated here.

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Abstract

The invention discloses a graphene-silicon composite material, a preparation method thereof, an electrode material and a battery and relates to the technical field of batteries so as to improve the structural stability of an electrode containing a silicon-based material, and therefore, the cycle performance of the battery is ensured. The preparation method of the graphene-silicon composite material comprises a step of mixing positively-charged silicon-based material dispersion liquid with a negatively-charged graphene-based material dispersion liquid such that a positively-charged silicon-based material and a negatively-charged graphene-based material are assembled together to obtain a graphene-silicon self-assembled material dispersion liquid, a step of drying the a graphene-silicon self-assembled material dispersion liquid by using spray drying to obtain a graphene-silicon self-assembled material, and a step of sintering the graphene-silicon self-assembled material in an inert environment to obtain the graphene-silicon composite material. The graphene-silicon composite material is prepared by the above preparation method. The graphene-silicon composite material provided by the invention is applied to the battery.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a graphene-silicon composite material, a preparation method thereof, an electrode material and a battery. Background technique [0002] In recent years, with the rapid development of new energy vehicles and portable electronic products, lithium-ion batteries have received more extensive attention and more in-depth research. Anode materials are an important part of lithium-ion batteries, which directly affect key indicators such as energy density, cycle life, and safety performance of batteries. [0003] Silicon-based material is a negative electrode material with ultra-high specific capacity (theoretical capacity 4200mAh / g), which is more than ten times the capacity of traditional carbon-based materials, and the discharge platform is equivalent to it. Therefore, silicon-based materials are regarded as the next generation The preferred anode material for lithium-ion batteries. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/583H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/386H01M4/583H01M4/625H01M10/0525H01M2004/027Y02E60/10
Inventor 郝胐王文阁闫晓荣袁伟李金来
Owner 内蒙古信敏惠纳米科技有限公司
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