A self-supporting carbon selenium material and its preparation method and application
A self-supporting, selenization technology, applied in the direction of positive electrode, active material electrode, structural parts, etc., can solve the problems of poor electrochemical performance, reduce the uniformity of composite positive electrode materials, etc., to achieve uniform distribution and improve specific capacity.
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[0027] In the present invention, the preparation method of the porous carbon fiber cloth preferably includes: activating the basic carbon fiber cloth to obtain the porous carbon fiber cloth. In the present invention, the temperature of the activation treatment is preferably 800-950°C, more preferably 820-900°C, more preferably 850-900°C; the time is preferably 1-3h, more preferably 1.5-3h, and more preferably The activation atmosphere is preferably carbon dioxide; the gas flow rate for providing the activation atmosphere is preferably 30-50 mL / min, more preferably 35-50 mL / min, and even more preferably 40-50 mL / min. In the present invention, there is no special limitation on the source of the basic carbon fiber cloth, and sources well-known to those skilled in the art can be used, specifically, commercially available. In a specific embodiment of the present invention, the basic carbon fiber cloth is preferably a commercially available product obtained by carbonization of polya...
Embodiment 1
[0040] The basic carbon fiber obtained by carbonizing polyacrylonitrile is arranged in a quartz tube furnace, and under the protection condition of nitrogen (flow rate: 50mL / min), the temperature is raised to 950°C at a rate of 2°C / min, and then immediately switched to carbon dioxide gas. The flow rate is kept at 50mL / min and the temperature is maintained at 950°C for 1 hour for activation treatment, and finally switched to nitrogen protection conditions to cool the activated porous carbon fiber cloth to room temperature with the furnace to obtain porous carbon fiber cloth;
[0041] With 562mg selenium dioxide powder, be dissolved in 10ml deionized water, obtain selenium dioxide aqueous solution, as in glass evaporating dish; 600mg gained porous carbon fiber cloth is immersed in gained selenium dioxide aqueous solution (by selenium: carbon cloth mass ratio 6: 4), fully wetted, and then dried at 40°C for 12 hours to obtain the impregnated material; the impregnated material was p...
Embodiment 2
[0049] Arrange the basic carbon fiber obtained by twill weaving and pitch carbonization in a quartz tube furnace. Under the protection of nitrogen (flow rate: 50mL / min), the temperature is raised to 800°C at a rate of 2°C / min, and then immediately switched to carbon dioxide gas , the flow rate is kept at 50mL / min and the temperature is maintained at 800°C for 3 hours for activation treatment, and finally switched to nitrogen protection conditions to cool the activated porous carbon fiber cloth to room temperature with the furnace to obtain porous carbon fiber cloth;
[0050] With 421.6mg selenium dioxide powder, be dissolved in 5mL deionized water, obtain selenium dioxide aqueous solution, as in glass evaporating dish; 300mg gained porous carbon fiber cloth is immersed in gained selenium dioxide aqueous solution (according to selenium: carbon cloth mass ratio 5 :5), fully wetted, and then dried at 40°C for 12h to obtain the impregnating material; the impregnating material was p...
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