Hard carbon material and preparation method and application thereof
A hard carbon and pre-oxidation technology, which is applied in the preparation/purification of carbon, electrical components, electrochemical generators, etc., can solve the problems of poor cycle stability, low first-cycle coulombic efficiency, and low reversible specific capacity, and achieve mild conditions Controllable, conducive to diffusion and transport, and increase the effect of specific surface area
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[0046]Example 1
[0047](1) Phenolic resin pretreatment: take 10g phenolic resin (specific surface area 2m2 / g) Completely dissolve in absolute ethanol, add phenolic resin 5wt% conductive carbon black and stir for 2h, then put it in an oven at 70°C for 12h to obtain treated phenolic resin.
[0048](2) Pre-oxidation treatment: 5g of the treated phenolic resin is calcined in an air atmosphere at a heating rate of 12°C / min to 200°C for 1h, and then at a heating rate of 8°C / min to 300°C for 1h. Finally, the temperature is increased to 400°C at a temperature rise rate of 5°C / min, and the mixture is calcined for 0.5h.
[0049](3) Cooling: The pre-oxidized particles are rapidly cooled to 150°C at 20°C / min, kept for 20S, and then naturally cooled to 30°C.
[0050](4) Carbonization: After taking out, the particles are ball-milled into powder, and the resulting powder is placed in a tube furnace, and carbonized at 1250°C for 6 hours in a 20% Ar / N2 atmosphere at a heating rate of 5°C / min. After cooling and...
Example Embodiment
[0052]Example 2
[0053](1) Phenolic resin pretreatment: take 10g phenolic resin (specific surface area 2m2 / g) Completely dissolve in absolute ethanol, add phenolic resin 5wt% conductive carbon black and stir for 2h, then put it in an oven at 70°C for 12h to obtain treated phenolic resin.
[0054](2) Pre-oxidation treatment: 5g of the treated phenolic resin is fired at a heating rate of 15°C / min to 250°C for 2h, and then heated to 350°C for 2h at a heating rate of 10°C / min. Finally, the temperature is increased to 450°C at a heating rate of 7°C / min and calcined for 1 hour.
[0055](3) Cooling: The pre-oxidized particles are rapidly cooled to 150°C at 20°C / min, kept for 20S, and then naturally cooled to 30°C.
[0056](4) Carbonization: After taking out, the particles are ball-milled into powder, and the obtained powder is put into a tube furnace, and carbonized at 1200°C for 6 hours in a 20% Ar / N2 atmosphere at a heating rate of 5°C / min, and then ball-milled into powder after taking it out , Get...
Example Embodiment
[0058]Example 3
[0059](1) Phenolic resin pretreatment: take 10g phenolic resin (specific surface area 2m2 / g) Completely dissolve in absolute ethanol, add phenolic resin 5wt% conductive carbon black and stir for 2h, then put it in an oven at 70°C for 12h to obtain treated phenolic resin.
[0060](2) Pre-oxidation treatment: 5g of the treated phenolic resin is fired at a heating rate of 11°C / min to 200°C for 1 hour, and then heated to 300°C for 2 hours at a heating rate of 9°C / min. Finally, the temperature is increased to 400°C at a temperature rise rate of 5°C / min, and the mixture is calcined for 1 hour.
[0061](3) Cooling: The pre-oxidized particles are rapidly cooled to 150°C at 20°C / min, kept for 20S, and then naturally cooled to 30°C.
[0062](4) Carbonization: After taking out, the particles are ball-milled into powder, and the resulting powder is placed in a tube furnace, and carbonized at 1300°C for 6 hours in a 20% Ar / N2 atmosphere at a heating rate of 5°C / min. After cooling and takin...
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