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Method for preparing microcrystalline graphene nanosheet/silicon composite electrode material

A technology of microcrystalline graphite and composite electrodes, applied in battery electrodes, nanotechnology, nanotechnology, etc., can solve problems such as time-consuming, cumbersome process, and impact on yield, and achieve high yield, less loss of raw materials, and improved conductivity Effect

Inactive Publication Date: 2018-03-09
HUNAN GUOSHENG GRAPHITE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nano-silicon powder is a new generation of optoelectronic semiconductor material. It has a wide gap energy semiconductor and is also a high-power light source material. The microcrystalline graphene / nano-silicon composite electrode material prepared by combining nano-silicon and microcrystalline graphene has good electrochemical stability. The traditional graphene-silicon composite materials are generally prepared by the reduction method of silicon-containing compounds, the process is cumbersome, time-consuming, and the yield is affected

Method used

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  • Method for preparing microcrystalline graphene nanosheet/silicon composite electrode material
  • Method for preparing microcrystalline graphene nanosheet/silicon composite electrode material
  • Method for preparing microcrystalline graphene nanosheet/silicon composite electrode material

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Embodiment 1

[0064] The present invention prepares the method for expanded microcrystalline graphite material with microcrystalline graphite, comprises steps as follows: comprises graphite expansion furnace, adopts high-temperature expansion method, comprises the following steps:

[0065] S1. Get the microcrystalline graphite raw material, the carbon content is 70%, crushing and grinding, until the particle size is 300 mesh microcrystalline graphite powder;

[0066] S2. the microcrystalline graphite powder obtained in step S1, perchloric acid and potassium permanganate are placed in the reaction device for the first chemical intercalation treatment to obtain an acidic suspension of expandable microcrystalline graphite, and the resulting expandable microcrystalline graphite Filtrate the acidic suspension, keep the filtrate for later use, then wash and dry the filtrate to obtain an expandable microcrystalline graphite; wherein, the specific steps of the first chemical intercalation are: S21. ...

Embodiment 2

[0073] The steps of this embodiment are basically the same as in Embodiment 1, the difference is that:

[0074] S1. Get the microcrystalline graphite raw material, the carbon content is 70%, crushing and grinding, until the particle size is 300 mesh microcrystalline graphite powder;

[0075] S2. The specific steps of chemical intercalation for the first time are: S21. Mix perchloric acid and microcrystalline graphite powder at a liquid-solid ratio of 15:1L / Kg and stir evenly; S22. Press microcrystalline graphite powder and high manganese The mass ratio of potassium permanganate is 4:1. Add potassium permanganate, stir evenly at room temperature, raise the temperature to 40°C and continue to stir for 2 hours; S23. Add deionized water to raise the temperature in the reaction device to 70°C, and then Continue to stir and react for 2h;

[0076] S4. The specific steps of the second chemical intercalation are: S41. The primary expanded microcrystalline graphite obtained in step S3 ...

Embodiment 3

[0080] The steps of this embodiment are basically the same as in Embodiment 1, the difference is that:

[0081] S1. Get the microcrystalline graphite raw material, the carbon content is 75%, crushing and grinding, until the particle size is 350 mesh microcrystalline graphite powder;

[0082] S2. The specific steps of chemical intercalation for the first time are: S21. Mix perchloric acid and microcrystalline graphite powder at a liquid-solid ratio of 20:1L / Kg and stir evenly; S22. Press microcrystalline graphite powder and high manganese The mass ratio of potassium permanganate is 6:1. Add potassium permanganate, stir evenly at room temperature, raise the temperature to 50°C and continue to stir for 2 hours; S23. Add deionized water to raise the temperature in the reaction device to 80°C, and then Continue to stir and react for 2h;

[0083] S4. The specific steps of the second chemical intercalation are: S41. The primary expanded microcrystalline graphite obtained in step S3 ...

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Abstract

The invention belongs to the technical field of material preparation and in particular relates to a method for preparing a microcrystalline graphene nanosheet / silicon composite electrode material. Themethod disclosed by the invention comprises the following steps: by taking microcrystalline graphite as a raw material, sequentially performing primary chemical intercalation treatment, primary hightemperature puffing treatment, secondary intercalation treatment and secondary high temperature puffing treatment on the microcrystalline graphite so as to obtain secondary puffed microcrystalline graphite; performing ultrasonic treatment on the secondary puffed microcrystalline graphite twice so as to obtain a stripping material, performing filter pressing, separating, cleaning and drying on thestripping material to obtain graphene; and mixing and carrying out ball milling on graphene nanosheets and nanometer silicon in inert gases, thereby obtaining the microcrystalline graphene nanosheet / silicon composite electrode material. According to the method disclosed by the invention, the production process flow is simple, the cost is low and a sulfur-free effect is achieved, and the microcrystalline graphene nanosheet / silicon composite electrode material can be prepared in batches.

Description

technical field [0001] The invention belongs to the technical field of material preparation, and more specifically relates to a method for preparing a microcrystalline graphene nanosheet / silicon composite electrode material. Background technique [0002] Graphene, is a sp 2 The hybridized carbon atoms form bonds in the form of a hexagonal lattice, and the formed two-dimensional planar single-layer structure of carbon is an allotrope of carbon. Graphene is the basic unit for constructing other dimensional carbon materials. When it changes in the way of wrapping, winding and stacking, it can form zero-dimensional fullerene, one-dimensional carbon nanotube and three-dimensional graphite respectively. Graphene has good electrical and optical properties, mechanical properties, thermal conductivity and extremely high charge carrier mobility, as well as excellent mechanical strength and flexibility. These properties of graphene make it attract a lot of attention and quickly becom...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/362H01M4/386H01M4/625H01M10/0525Y02E60/10
Inventor 李丽萍林前锋
Owner HUNAN GUOSHENG GRAPHITE TECH CO LTD
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