Biomass-based porous silicon-carbon composite material and preparation method thereof
A silicon-carbon composite material and a technology for carbon composite materials, which are applied in the preparation/purification of carbon, chemical instruments and methods, nanotechnology for materials and surface science, etc., and can solve problems such as the source of anode electrode materials for new power batteries, etc. Achieving the effect of cheap raw materials, increased diffusion rate and low material cost
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Embodiment 1
[0063] A method for preparing a biomass-based porous silicon-carbon composite material, the specific steps are:
[0064] 1. Preparation of biomass-based porous silicon-carbon composite precursor (p-C / Si)
[0065] S1 Pueraria residue pretreatment: at room temperature, use detergent as a cleaning agent to stir and clean the skin of Pueraria residue to remove surface gravel and internal impurities, and then crush it to fine powder particles with a particle size of 3 μm to 5 μm. The kudzu root residue powder was further washed and purified in an aqueous solution with purification equipment, and dried in a blast oven at a temperature of 100° C. for 12 hours to obtain pure kudzu root residue powder.
[0066] S2 spray granulation: take by weighing 100g of kudzu root residue micropowder and 5g of 30nm silicon powder and disperse in ethanol solution, the quality sum of kudzu root residue micropowder and nano silicon powder is 10% of the sum of kudzu root residue micro powder, nano sili...
Embodiment 2
[0076] A method for preparing a biomass-based porous silicon-carbon composite material, the specific steps are:
[0077] 1. Preparation of biomass-based porous silicon-carbon composite precursor (p-C / Si)
[0078] S1 Pueraria residue pretreatment: at room temperature, use detergent as a cleaning agent to stir and clean the residue of Pueraria root to remove surface gravel and internal impurities, and then crush it to fine powder particles with a particle size of 3-5 μm. The kudzu root residue powder in the aqueous solution is further cleaned and purified by a purification device, and after being physically purified and dried by a vacuum filter, the pure kudzu root residue powder is obtained.
[0079] S2 spray granulation: take by weighing 100g of kudzu root residue micropowder and 30g of 100nm silicon powder and disperse them in methanol solution. %, liquid phase mechanical mixing at 600r / min for 110min. The mixed solution is transferred to a constant temperature water bath, st...
Embodiment 3
[0089] A method for preparing a biomass-based porous silicon-carbon composite material, the specific steps are:
[0090] 1. Preparation of biomass-based porous silicon-carbon composite precursor (p-C / Si)
[0091] S1 kudzu root residue pretreatment: at room temperature, use detergent as a cleaning agent to stir and clean the kudzu root residue process residue to remove surface gravel and internal residual impurities, and then pulverize it into fine powder particles with a particle size of 3-5 μm, and put the pulverized The kudzu root residue powder is further washed and purified by a purification device in an aqueous solution, and after being physically purified and dried by a centrifuge, the pure kudzu root residue powder is obtained.
[0092] S2 spray granulation: Weigh 100g of kudzu root residue micropowder and 20g of 100nm silicon powder and disperse them in the isopropanol solution. 35% of liquid phase mechanical mixing at 700r / min for 100min. The mixed solution is trans...
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