Method for preparing porous silicon-carbon composite material in situ
A carbon composite material, in-situ preparation technology, applied in nanotechnology for materials and surface science, electrical components, electrochemical generators, etc., can solve high cost, complex equipment requirements, unfavorable large-scale production and industrialization, etc. problem, to achieve the effect of uniform size
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Embodiment 1
[0053] 1. Add 0.2g PEI (Mw=70000) into a mixed solvent composed of 30mL ethanol and 2mL water, stir at room temperature for 1h to obtain a mixed solution;
[0054] 2. While stirring, slowly add tetraethyl orthosilicate (1.15mL) dropwise into the mixed solution prepared in step 1, heat and stir at 60°C for 3h to obtain a milky white suspension, and centrifuge (speed: 8000r / min) to obtain transparent colloid;
[0055] 3. Dry the transparent colloid in a vacuum drying oven at 80°C for 6 hours to obtain a white powder, which is the silicon carbon precursor;
[0056] 4. Mix 0.2g of silicon-carbon precursor with magnesium powder of equal mass, put it into a tube furnace and react at 650°C for 6h under a protective atmosphere of argon to obtain a white powder, wash the powder with hydrochloric acid and then dry it in vacuum for 5h to obtain Porous silicon carbon composites.
[0057] figure 1 In the XRD pattern of the product prepared in this example, an obvious peak of silicon was...
Embodiment 2
[0068] 1. Add 0.6g PEI (Mw=100000) into a mixed solvent composed of 30mL ethanol and 0.5mL water, and stir at room temperature for 1 hour to obtain a mixed solution;
[0069] 2. While stirring, slowly add tetraethyl orthosilicate (1.15mL) dropwise into the mixed solution prepared in step 1, heat and stir at 60°C for 3h to obtain a milky white suspension, and centrifuge (speed: 8000r / min) to obtain transparent colloid;
[0070] 3. Dry the transparent colloid in a vacuum drying oven at 80°C for 6 hours to obtain a white powder, which is the silicon carbon precursor;
[0071] 4. Mix 0.2g of silicon-carbon precursor with magnesium powder of equal mass, put it into a tube furnace and react at 650°C for 6h under a protective atmosphere of argon to obtain a white powder, wash the powder with hydrochloric acid and then dry it in vacuum for 5h to obtain Porous silicon carbon composites.
Embodiment 3
[0073] 1. Add 0.4g PEI (Mw=70000) into a mixed solvent composed of 30mL ethanol and 3mL water, stir at room temperature for 1h to obtain a mixed solution;
[0074] 2. While stirring, slowly add tetraethyl orthosilicate (3mL) dropwise into the mixed solution prepared in step 1, heat and stir at 60°C for 3h to obtain a milky white suspension, and centrifuge (rotating at 8000r / min) to obtain transparent colloid;
[0075] 3. Dry the transparent colloid in a vacuum drying oven at 80°C for 6 hours to obtain a white powder, which is the silicon carbon precursor;
[0076] 4. Mix 0.2g of silicon-carbon precursor with magnesium powder of equal mass, put it into a tube furnace and react at 650°C for 6h under a protective atmosphere of argon to obtain a white powder, wash the powder with hydrochloric acid and then dry it in vacuum for 5h to obtain Porous silicon carbon composites.
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