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Graphene-like carbon-coated silicon/carbon/graphene composite material, preparation method thereof and negative electrode material

A technology of graphene carbon and composite materials, applied in the preparation/purification of carbon, graphene, carbon compounds, etc., can solve the problems of poor cycle stability of Si/C composite materials, achieve large-scale mass production and improve cycle stability Sexuality and cost reduction effect

Pending Publication Date: 2021-02-19
YINLONG ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The main purpose of the present invention is to provide a silicon / carbon / graphene composite material coated with graphene-like carbon, its preparation method and negative electrode material, to solve the problem of poor cycle stability of Si / C composite material in the prior art

Method used

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  • Graphene-like carbon-coated silicon/carbon/graphene composite material, preparation method thereof and negative electrode material
  • Graphene-like carbon-coated silicon/carbon/graphene composite material, preparation method thereof and negative electrode material
  • Graphene-like carbon-coated silicon/carbon/graphene composite material, preparation method thereof and negative electrode material

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preparation example Construction

[0024]In another exemplary embodiment of the present application, a method for preparing the aforementioned graphene-like carbon-coated silicon / carbon / graphene composite material is provided. The preparation method includes: Step S1: , Phenolic resin solution, graphene slurry and graphite are mixed to obtain a mixture; step S2, the mixture is dried to obtain dried composite material powder; step S3, in an inert atmosphere, the dried composite material powder, carbon source and The foaming agent is mixed and heated to obtain a carbon-coated composite material; and in step S4, the carbon-coated composite material is calcined to obtain a graphene-like carbon-coated silicon / carbon / graphene composite material.

[0025]The carbon source is first melted into a liquid slurry during heating, and the liquid slurry will gradually polymerize to obtain macromolecular polymers and wrap them on the surface of the composite powder. The chemical gas released by the foaming agent will blow out the macro...

Embodiment 1

[0040]Weigh 400g of silicon powder with a particle size of 100μm and mill it with a zirconia ball with a particle size of 0.1mm. The mass ratio of the balls is 1.6:1, the solvent is ethanol, and the mixed is evenly mixed. The solution was added to the nano-sand mill, and ball milled at a ball milling speed of 2000 rpm / min for 5 hours to obtain a nano silicon solution with a mass concentration of 0.13 g / mL.

[0041]Mix 3000mL of nano silicon solution with 500mL of phenolic resin ethanol solution with a mass concentration of 0.2g / mL, 500mL of graphene slurry with a mass concentration of 0.03g / mL, 4485g of graphite, stir until uniform, and then use a high-speed grinding and dispersing machine The mixture was ground and dispersed for 2 hours at a speed of 2000 rpm / min to obtain a mixture. The mixture is spray-dried at 160° C. for 0.5 h to obtain a dried composite material powder. The dried composite material powder includes 8% nano silicon, 2% phenolic resin, 0.1% graphene, and 89.9% graph...

Embodiment 2

[0045]The difference between Example 2 and Example 1 is that the mass ratio of composite material powder, glucose and ammonium chloride after drying is 95:5:5 to obtain a graphene-like carbon coated silicon / carbon / graphene composite material. The diameter (D50) is 23 μm, and includes 1% graphene-like carbon coating layer, 10% silicon, 88.7% carbon, and 0.3% graphene.

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Abstract

The invention provides a graphene-like carbon-coated silicon / carbon / graphene composite material, a preparation method thereof and a negative electrode material. The graphene-like carbon-coated silicon / carbon / graphene composite material comprises the following components in percentage by mass: 1 to 10 percent of graphene-like carbon coating layer, 1 to 15 percent of silicon, 80 to 95 percent of carbon and 0.1 to 5 percent of graphene. The graphene-like carbon-coated silicon / carbon / graphene composite material is used as an electrode of a battery, so the cost can be greatly reduced, and large-scale mass production is realized. The nano-silicon of the graphene-like carbon coated silicon / carbon / graphene composite material is coated with the graphene and graphene-like double carbon layers, so that the volume effect of the nano-silicon can be effectively relieved, the direct contact between the nano-silicon and an electrolyte is avoided, and the cycling stability of the Si / C composite material is further improved. And the graphene-carbon-coated silicon / carbon / graphene composite material is good in conductivity, high in specific capacity, wide in raw material source, economical and environment-friendly.

Description

Technical field[0001]The invention relates to the technical field of battery materials, in particular to a graphene-like carbon-coated silicon / carbon / graphene composite material, a preparation method thereof, and a negative electrode material.Background technique[0002]With the rapid development of portable electronic equipment and electric vehicles, there is an increasing demand for high-energy electronic devices, and the development of high-energy density batteries is imminent. However, the commercial graphite anode has a low theoretical capacity (372mAh / g), which cannot meet the increasing demand for high-energy electronic devices. Silicon anode material due to its highest theoretical specific capacity (about 4200mAh / g) and lower (compared to Li / Li+Compared) discharge potential (<0.5V) has attracted great attention. However, the conductivity of silicon is low, and silicon will produce a huge volume expansion effect during the process of lithium ion insertion / deintercalation, wh...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/587H01M4/62H01M10/0525C01B32/05C01B32/194C01B33/021B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01B33/021C01B2204/22C01B32/05C01B32/194H01M4/366H01M4/386H01M4/587H01M4/625H01M10/0525Y02E60/10
Inventor 朱守超马源詹世英李海军蔡惠群
Owner YINLONG ENERGY CO LTD
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