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Core-shell 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, structural damage of silicon-based materials, collapse of electrode structures, etc., to avoid cycle performance degradation 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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  • Core-shell graphene-silicon composite material, preparation method thereof, electrode material and battery
  • Core-shell graphene-silicon composite material, preparation method thereof, electrode material and battery
  • Core-shell graphene-silicon composite material, preparation method thereof, electrode material and battery

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Embodiment 1

[0032] The embodiments of the present invention provide a core-shell graphene-silicon composite material and a preparation method thereof, so that the formed core-shell graphene-silicon composite material includes a graphene-silicon composite material coated with a carbon layer on the surface; When the core-shell graphene-silicon composite material is applied to the electrode of the battery, the contact between the active ions contained in the electrolyte and the graphene-silicon composite material can be avoided, thereby reducing the concentration of the core-shell graphene-silicon composite material. Degree of silicon expansion. like figure 1 As shown, the preparation method of the core-shell graphene-silicon composite material includes:

[0033] Step S120: Mixing the graphene-silicon composite material and the carbon source uniformly to obtain a premix; the core-shell graphene-silicon composite material is a self-made graphene-silicon composite material, or a purchased gra...

Embodiment 2

[0079] The embodiment of the present invention also provides a core-shell graphene-silicon composite material, the core-shell graphene-silicon composite material includes a graphene-silicon composite material, and the graphene-silicon composite material can be purchased, or It can be self-made. If it is self-made, it can be prepared by referring to the preparation method of the graphene-silicon composite material described in Embodiment 1. The surface of the graphene-silicon composite material is covered with a carbon layer.

[0080] The invention also provides a core-shell graphene-silicon composite material, the core-shell graphene-silicon composite material is the core-shell graphene- Silicon composite.

[0081] Compared with the prior art, the core-shell graphene-silicon composite material provided in the embodiment of the present invention has the same beneficial effects as the above-mentioned preparation method of the core-shell graphene-silicon composite material, which...

Embodiment 3

[0083] An embodiment of the present invention provides a method for preparing a graphene-silicon composite material, comprising the following steps:

[0084] In the first step, 2g of nano-silicon with a particle size of 80nm-200nm is dispersed in 500mL of ethanol, and ultrasonically dispersed for 1.5h to obtain a nano-silicon ethanol dispersion; 8mL of 5% ammonia water is added dropwise to the nano-silicon ethanol dispersion. , to obtain an alkaline nano-silicon dispersion with pH=9; add 4 g of 3-aminopropyltriethoxysilane dropwise to the alkaline nano-silicon dispersion, and stir mechanically for 5 h at room temperature to obtain a positively charged Dispersion of silicon-based materials; centrifuge the dispersion containing positively charged silicon-based materials with a centrifuge, collect the precipitate obtained by centrifugation, and then wash the precipitate three times with high-purity water centrifugation. After drying for 10 hours, the aminated nano-silicon was obt...

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Abstract

The invention discloses a core-shell graphene-silicon composite material, a preparation method thereof, a battery material and a battery and relates to the technical field of batteries, and the problem of the degradation of the cycle performance of an electrode of a material containing a silicon substrate due to volume expansion is solved. The preparation method of the core-shell graphene-siliconcomposite material comprises a step of uniformly mixing a graphene-silicon composite material and a carbon source to obtain a premix, and a step of calcining the premix in an inert environment such that the carbon source contained in the premix is carbonized to obtain the core-shell graphene-silicon composite material. The core-shell graphene-silicon composite material is prepared by the above preparation method. The core-shell graphene-silicon composite material and the preparation method provided by the invention are used in the battery.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a core-shell graphene-silicon composite material and a preparation method thereof, an electrode material and a battery. Background technique [0002] At present, commercial lithium-ion power batteries generally use graphite materials as the negative electrode, and their actual discharge specific capacity is close to the theoretical value of 372mAh / g, so that the technical route of using graphite materials as negative electrode materials can no longer meet the high specific capacity of commercial lithium-ion power batteries. Therefore, many anode material manufacturers have begun to adjust their strategic direction and increase the layout of new anode materials, among which silicon-based anodes have attracted much attention. [0003] Silicon-based materials have a high theoretical lithium storage capacity (4200mAh / g) and are considered to be the most promising next-generation an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/366H01M4/386H01M4/583H01M4/625H01M10/0525H01M2004/027Y02E60/10
Inventor 郝胐王文阁王俊美张勃李金来袁伟
Owner 内蒙古信敏惠纳米科技有限公司
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