A kind of graphene-element silicon composite airgel and preparation method thereof
A composite airgel and graphene technology, which is applied in the direction of airgel preparation, graphene, silicon compounds, etc., can solve the problems of poor cycle performance and low battery capacity of silicon-based negative electrode materials, and achieve improved cycle performance and lithium storage capacity huge effect
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Embodiment 1
[0031] 1 mol tetraethyl orthosilicate, 10 mol deionized water and 5 mol absolute ethanol were uniformly stirred for 5 min, then 0.02 mol of 10 mg / ml graphene oxide aqueous solution was added to the mixed solution, and ultrasonically dispersed for 30 min. Then add 1 mol / L hydrochloric acid ethanol solution, measure the pH of the solution to 2 by pH test paper, and stir for 20 min. Finally, 0.5 mol / L ammonia water ethanol solution was added, and the pH of the solution was measured by a pH meter to reach 6.5, stirred for 5 minutes, poured into a mold, and waited for gelation at 20°C. Absolute ethanol was used as the aging solution to replace the impurity ions in the wet gel, 6 times for 10 hours each time. Then put the composite wet gel into a high-temperature autoclave, and use CO 2 The samples were dried by supercritical drying method, in which CO 2 The pressure is controlled at 10MPa, the temperature is controlled at 45°C, and the supercritical drying time is 12h. Then the ...
Embodiment 2
[0033] 1 mol tetraethyl orthosilicate, 20 mol deionized water and 10 mol absolute ethanol were uniformly stirred for 5 min, then 0.12 mol of 10 mg / ml graphene oxide aqueous solution was added to the mixed solution, and ultrasonically dispersed for 40 min. Then add 1 mol / L hydrochloric acid ethanol solution, measure the pH of the solution to 3 by pH test paper, and stir for 30 min. Finally, 0.5 mol / L ammonia water ethanol solution was added, and the pH of the solution was measured by a pH meter to reach 7.8, stirred for 10 minutes, poured into a mold, and waited for gelation at 70°C. Absolute ethanol was used as the aging solution to replace the impurity ions in the wet gel, 8 times for 12 hours each time. Then put the composite wet gel into a high-temperature autoclave, and use CO 2 The samples were dried by supercritical drying method, in which CO 2 The pressure is controlled at 12MPa, the temperature is controlled at 50°C, and the supercritical drying time is 24h. Then th...
Embodiment 3
[0035]1 mol tetraethyl orthosilicate, 10 mol deionized water and 10 mol absolute ethanol were uniformly stirred for 7 minutes, then 0.10 mol of 10 mg / ml graphene oxide aqueous solution was added to the mixed solution, and ultrasonically dispersed for 35 minutes. Then add 1 mol / L hydrochloric acid ethanol solution, measure the pH of the solution to 2 by pH test paper, and stir for 30 min. Finally, 0.5 mol / L ammonia water ethanol solution was added, and the pH of the solution was measured by a pH meter to reach 7.0, stirred for 5 minutes, poured into a mold, and waited for gelation at 50°C. Absolute ethanol was used as the aging solution to replace the impurity ions in the wet gel, 6 times for 12 hours each time. Then put the composite wet gel into a high-temperature autoclave, and use CO 2 The samples were dried by supercritical drying method, in which CO 2 The pressure is controlled at 10MPa, the temperature is controlled at 50°C, and the supercritical drying time is 24h. T...
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