A kind of preparation method of lithium-sulfur battery cathode material of modified carbon nanofiber
A lithium-sulfur battery and nanofiber technology, applied in the field of material chemistry, can solve the problems of low sulfur loading, obvious shuttle effect, poor cycle stability, etc., and achieve the effect of high porosity, good uniformity, and enhanced conductivity
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Embodiment 1
[0025] The first step is to prepare the sheet-like structure composite precursor material:
[0026] 1.5 g of polyacrylonitrile and 3 g of cobalt acetate were placed in 15 mL of N,N-dimethylformamide, stirred for 12 hours, and composite nanofibers were prepared by electrospinning. After being torn off from the tin foil for electrospinning, it was first placed in a muffle furnace, and the temperature was raised to 300°C at a heating rate of 2°C / min, and kept for 2h. After cooling with the furnace, it was transferred to a tube furnace, and the temperature was raised to 700 °C under an argon atmosphere at a heating rate of 2 °C / min. After the heating was completed, it was kept for 2 hours, and naturally cooled to obtain a sheet-like structure composite precursor material.
[0027] The second step prepares cobalt nitride-cobalt tetroxide-carbon nanofiber composite material:
[0028] Put 0.3 g of the sheet-like composite precursor material prepared in the first step in a tube furna...
Embodiment 2
[0032] The first step is to prepare the sheet-like structure composite precursor material:
[0033] Take 2g of polyacrylonitrile and 5g of cobalt acetate in 20mL of N,N-dimethylformamide, stir for 24 hours and then prepare composite nanofibers by electrospinning. After being torn off from the tin foil for electrospinning, it was first placed in a muffle furnace, and the temperature was raised to 400°C at a heating rate of 5°C / min, and kept for 2h. Then cool with the furnace, transfer it to a tube furnace, raise the temperature to 800 °C in an argon atmosphere, the heating rate is 5 °C / min, keep warm for 2 h after the heating is completed, and then naturally cool to obtain a composite precursor material with a sheet structure.
[0034] The second step prepares cobalt nitride-cobalt tetroxide-carbon nanofiber composite material:
[0035] Put 0.3 g of the sheet-like structure composite precursor material prepared in the first step into a tube furnace, raise the temperature to 60...
Embodiment 3
[0039] The first step is to prepare the sheet-like structure composite precursor material:
[0040]1 g of polyacrylonitrile and 1 g of cobalt acetate were placed in 10 mL of N,N-dimethylformamide, stirred for 12 hours, and composite nanofibers were prepared by electrospinning. After being torn off from the tin foil for electrospinning, it was first placed in a muffle furnace, and the temperature was raised to 200°C at a heating rate of 1°C / min, and kept for 1h. With the furnace cooling, it was transferred to a tube furnace, and the temperature was raised to 600 °C in an argon atmosphere at a heating rate of 1 °C / min. After the heating was completed, it was kept for 1 h, and then naturally cooled to obtain a composite precursor material with a sheet structure.
[0041] The second step prepares cobalt nitride-cobalt tetroxide-carbon nanofiber composite material:
[0042] Put 1 g of the sheet-like composite precursor material prepared in the first step in a tube furnace, and rai...
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