Preparation method of porosity controllable graphene modified silicon-carbon composite material

A silicon-carbon composite material, graphene modification technology, applied in nanotechnology, electrical components, electrochemical generators for materials and surface science, etc., can solve the problem of low specific surface area, high electrical conductivity, first efficiency cycle maintenance The problem of high rate, low specific surface area, high electrical conductivity, and excellent point-to-point conductivity are achieved.

Active Publication Date: 2019-06-11
SUPERCDONGGUAN TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The object of the present invention is to provide a method for preparing a graphene-modified silicon-carbon composite material with controllable porosity. The graphene-modified nano-silicon prepared by the method has controllable porosity, high mechanical strength, low specific surface area, and The advantages of high efficiency, high first-time efficiency and high cycle retention rate solve the technical problems in the preparation of nano-silicon by mechanical ball milling in the above-mentioned background technology

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  • Preparation method of porosity controllable graphene modified silicon-carbon composite material
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  • Preparation method of porosity controllable graphene modified silicon-carbon composite material

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Embodiment 1

[0037] Embodiment 1, the present embodiment is the preparation of the graphene-modified nano silicon powder of particle diameter 10-60nm porosity 45%:

[0038] Step 1. Pre-disperse coarse silicon powder: Add 300g of polymer copolymer dispersant to the mixed solvent of 10kg of deionized water and 9kg of absolute ethanol, stir until completely dissolved; then add 1kg of high-purity metal silicon with a particle size of 5um powder, and high-speed stirring to disperse evenly to obtain a slurry with a solid content of 5% coarse silicon powder.

[0039]Step 2. Preparation of nano-silicon slurry: pass nitrogen protection into the dispersion tank, add 0.1mm zirconia balls to the ball mill tank according to the ball-to-material ratio of 100:1, set the line speed to 800m / s and the feed pump pressure to 0.2MPa , start circulating ball milling, and obtain uniformly dispersed nano-silicon slurry after ball milling for 8 hours.

[0040] Step 3, preparing nano-silicon powder: spray-drying t...

Embodiment 2

[0044] Embodiment 2, the present embodiment is the preparation of the graphene-modified nano silicon powder of particle diameter 50-100nm porosity 30%:

[0045] Step 1. Pre-disperse coarse silicon powder: Add 250g of polymer copolymer dispersant and 50g of ascorbic acid to 19kg of absolute ethanol, then add 1kg of high-purity metal silicon powder with a particle size of 5um, stir at high speed and disperse evenly to obtain a concentration of 10% The pre-dispersed coarse silica powder slurry.

[0046] Step 2. Prepare nano-silicon slurry: pass nitrogen protection into the dispersion tank, add 0.2mm zirconia balls to the ball mill tank according to the ball-to-material ratio of 100:1, set the line speed to 800m / s and the feed pump pressure to 0.2MPa , start circulating ball milling, and obtain uniformly dispersed nano-silicon slurry after ball milling for 7 hours.

[0047] Step 3, preparing nano-silicon powder: spray-drying the nano-silicon slurry obtained in step 2 to obtain na...

Embodiment 3

[0051] Embodiment 3, the present embodiment is the preparation of the graphene-modified nano silicon powder of particle diameter 80-200nm purity 20%:

[0052] Step 1. Pre-disperse coarse silicon powder: add 200g of polymer copolymer dispersant and 50g of ascorbic acid until 15kg of ethylene glycol dissolves completely, then add 1kg of high-purity metal silicon powder with a particle size of 5um, stir at high speed and disperse evenly to obtain 10 % concentration of pre-dispersed coarse silicon powder slurry.

[0053] Step 2. Preparation of nano-silicon slurry: pass nitrogen protection into the dispersion tank, add 0.3mm zirconia balls into the ball mill tank according to the ball-to-material ratio of 100:1, set the line speed to 600m / s and the feed pump pressure to 0.2MPa , start circulating ball milling, and obtain uniformly dispersed nano-silicon slurry after ball milling for 7 hours.

[0054] Step 3, preparing nano-silicon powder: spray-drying the nano-silicon slurry obtai...

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Abstract

The invention discloses a preparation method of a porosity controllable graphene modified silicon-carbon composite material. The preparation method comprises the following specific manufacturing steps: step one, preparing a pre-dispersed coarse silica powder sizing agent: firstly adding a dispersing agent and an addition agent into a solvent, stirring for complete dissolution, then adding high-purity metal silica powder with the particle diameter of 1 to 10 microns, and then stirring for uniform dispersion to obtain the coarse silica powder sizing agent; step two, preparing a nano-scale silicon sizing agent: adding the coarse silica powder sizing agent obtained in the step one into a dispersion tank, introducing protective gas into the dispersion tank, and adding a ball-milling medium intoa ball-milling tank according to the ratio of a grinding medium to a material being (200 to 20): 1; step three, preparing a nanometer silica powder; step four, preparing a graphene modified nanometersilicon composite sizing agent; and step five, preparing the graphene modified silicon-carbon composite material used for an energy storage material. The graphene modified nanometer silicon preparedby the method is controllable in porosity, and has the advantages of high mechanical strength, low specific surface area, high conductivity, high initial efficiency and high circulation retention rate.

Description

technical field [0001] The invention relates to the technical field of energy storage materials, in particular to a method for preparing a graphene-modified silicon-carbon composite material with controllable porosity. Background technique [0002] With the rapid development of energy demand, the energy density of lithium-ion batteries is increasing at a rate of 7% to 10% per year. The capacity of graphite carbon negative electrode materials has reached 360mAh / g, which is close to the theoretical gram capacity of 372mAh / g. There is room for improvement. It is difficult to realize, and it is imminent to develop new lithium battery negative electrode materials. Silicon has a super high theoretical lithium intercalation capacity (4200mAh / g), which is about ten times that of carbon materials, and has a charging and discharging platform similar to graphite, and has the advantages of low price and abundant reserves. , but in the process of deintercalating lithium, a single silicon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525B82Y30/00
CPCY02E60/10
Inventor 胡玲
Owner SUPERCDONGGUAN TECH
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