Cobaltosic oxide /carbon nanofiber composite material, and preparation method and application thereof
A technology of cobalt tetroxide nanometer and carbon nanofiber is applied in the field of nanocomposite, which can solve the problems of large volume expansion and poor electrical conductivity, and achieve the effects of increasing the de-insertion rate, good thermal stability and high capacity.
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Embodiment 1
[0037] Mix 0.5 g of cobalt acetate tetrahydrate and 1 g of polyacrylonitrile (PAN), add 9 g of N,N-dimethylamide, and perform magnetic stirring at 70° C. for 2 h. After stirring evenly, let it stand for 12 hours to configure the precursor. Put the sol into a plastic syringe for electrospinning, the electric field strength is 1kv / cm, the ambient humidity is 20% RH, the fibers are collected with aluminum foil, and the spun cobalt-containing polymer nanofibers are placed in a vacuum box for storage 24h. Then place the fibers in a tube furnace for pre-oxidation at 250°C, keep warm for 3 hours and then cool in the furnace with a heating rate of 5°C / min without protective gas. The pre-oxidized fibers were placed in a tube furnace for sintering at a temperature of 1000° C., kept for 1 hour, protected by argon, and cobalt-containing carbon nanofibers were obtained after furnace cooling. The cobalt-containing carbon nanofibers were placed in a tube furnace for secondary oxidation at ...
Embodiment 2
[0039]Mix 0.5 g of cobalt acetate tetrahydrate and 1 g of polyacrylonitrile (PAN), add 9 g of N,N-dimethylamide, and perform magnetic stirring at 70° C. for 2 h. After stirring evenly, let it stand for 12 hours to configure the precursor. Put the sol into a plastic syringe for electrospinning, the electric field strength is 1kv / cm, the ambient humidity is 20% RH, the fibers are collected with aluminum foil, and the spun cobalt-containing polymer nanofibers are placed in a vacuum box for storage 24h. Then place the fibers in a tube furnace for pre-oxidation at 250°C, keep warm for 3 hours and then cool in the furnace with a heating rate of 5°C / min without protective gas. The pre-oxidized fibers were placed in a tube furnace for sintering at a temperature of 700° C., kept for 1 hour, protected by nitrogen, and cobalt-containing carbon nanofibers were obtained after furnace cooling. The cobalt-containing carbon nanofibers were placed in a tube furnace for secondary oxidation at...
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