A kind of cobalt sulfide and multilevel carbon nanostructure composite material and its preparation method and application
A carbon nanostructure and composite material technology, applied in nanotechnology, structural parts, nanotechnology and other directions, can solve problems such as capacity attenuation of negative electrode materials, and achieve the effects of alleviating the pulverization effect, making the preparation process safe and easy to operate, and inhibiting the agglomeration effect.
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Embodiment 1
[0022] (1) Disperse 0.05g of graphene oxide into 50ml of deionized water, ultrasonically peel off, then add 0.252g of melamine and 0.177g of thiocyanic acid, and stir at 60°C for 30min. 0.05 g of cobalt acetate was added. Stirring was continued at 60 °C for 1 h. The product is then freeze-dried.
[0023] (2) The precursor is placed in a tube furnace, protected by argon, and heated to 600°C at a heating rate of 2°C / min and kept for 2h, with an argon gas flow rate of 0 sccm.
[0024] (3) Then the product is mixed with sulfur powder at a mass ratio of 1:1, under the condition of argon protection, the temperature is raised to 500°C at a heating rate of 5°C / min and kept for 1h, and the flow rate of argon gas is 50sccm; vulcanization After the treatment is completed, the sample is naturally cooled under an inert gas protection atmosphere and then taken out to obtain a composite material of cobalt sulfide and multi-level carbon nanostructure.
Embodiment 2
[0026] (1) Disperse 0.05g of graphene oxide into 25ml of deionized water, ultrasonically peel it off, then add 0.504g of melamine and 0.304g of thiocyanuric acid, and stir at 80°C for 30min. 0.5 g of cobalt acetate was added. Continue stirring at 80°C for 4h. The product is then freeze-dried.
[0027] (2) The precursor is placed in a tube furnace, protected by argon, and heated to 700°C at a heating rate of 5°C / min and kept for 2h, with an argon gas flow rate of 50sccm.
[0028] (3) Then mix the product with sulfur powder at a mass ratio of 1:2, under the condition of argon protection, raise the temperature to 600°C at a heating rate of 5°C / min and keep it warm for 1.5h, the flow rate of argon gas is 150sccm; After the sulfidation treatment is completed, the sample is naturally cooled under an inert gas protective atmosphere and then taken out to obtain a composite material of cobalt sulfide and multi-level carbon nanostructure.
[0029] refer to figure 1 , figure 1 SEM p...
Embodiment 3
[0031] (1) Disperse 0.1 g of graphene oxide into 40 ml of deionized water, ultrasonically peel it off, then add 1.26 g of melamine and 0.708 g of thiocyanuric acid, and stir at 70° C. for 1 h. 0.8 g of cobalt chloride was added. Continue to stir at 70°C for 1h. The product is then freeze-dried.
[0032] (2) The precursor is placed in a tube furnace, protected by argon, and heated to 800°C at a heating rate of 10°C / min and kept for 2h, with an argon gas flow rate of 100 sccm.
[0033] (3) Then the product is mixed with sulfur powder at a mass ratio of 1:2.5, under the condition of argon protection, the temperature is raised to 700°C at a heating rate of 5°C / min and kept for 2h, and the flow rate of argon gas is 200sccm; vulcanization After the treatment is completed, the sample is naturally cooled under an inert gas protection atmosphere and then taken out to obtain a composite material of cobalt sulfide and multi-level carbon nanostructure.
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