A nano-carbon fiber composite material for lithium-sulfur battery positive electrode and its preparation method and application
A nano-carbon fiber and composite material technology, applied in the field of chemical materials, can solve problems such as unreasonable structure design and complicated preparation process, and achieve the effects of promoting reaction kinetics, increasing contact area, and strong operability
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Embodiment 1
[0035] As an embodiment of the present invention, a preparation method of a carbon nanofiber composite material comprises the following steps:
[0036] (1) Add polyacrylonitrile powder with a molecular weight of 250,000 to DMF and heat it to 50°C, the mass percentage of polyacrylonitrile in DMF is 25%, and magnetically stir for 5 hours to fully dissolve the polyacrylonitrile powder in DMF as a shell solution A;
[0037] (2) Add polystyrene with a molecular weight of 5000 to DMF, the mass percentage of polystyrene in DMF is 35%, stir in a 60°C environment for 8h to fully dissolve, then divide it into three equal parts, add to one of them Add nickel acetate powder to 2 parts, and ultrasonically disperse for 2 hours as core solution B; under the same process conditions, add cobalt acetate powder and manganese acetate powder to the other 2 parts of polystyrene solution, respectively, as core solution C, core solution D, Among them, the mass fraction of nickel acetate, cobalt acet...
Embodiment 2
[0044] As an embodiment of the present invention, a preparation method of a carbon nanofiber composite material comprises the following steps:
[0045] (1) Add polyacrylonitrile powder with a molecular weight of 250,000 to DMF and heat it to 50°C, the mass percentage of polyacrylonitrile in DMF is 25%, and magnetically stir for 5 hours to fully dissolve the polyacrylonitrile powder in DMF as a shell solution A;
[0046] (2) Add polymethyl acrylate with a molecular weight of 5000 to DMF, the mass percentage of polymethyl acrylate in DMF is 35%, stir for 8 hours at 60 ° C to fully dissolve, and then divide it into three equal parts, to the Nickel acetate powder was added to one of them, and ultrasonically dispersed for 2 hours as core solution B; under the same process conditions, cobalt acetate powder and manganese acetate powder were added to the other two parts of polymethyl acrylate solution, respectively, as core solution C and core solution B. Liquid D, wherein the mass f...
Embodiment 3
[0053] As an embodiment of the present invention, a preparation method of a carbon nanofiber composite material comprises the following steps:
[0054] (1) Add polyacrylonitrile powder with a molecular weight of 150,000 into DMF and heat it to 50°C, the mass concentration of polyacrylonitrile is 25%, and magnetically stir for 5 hours, so that the polyacrylonitrile powder is fully dissolved in DMF as shell solution A;
[0055] (2) Add polyurethane with a molecular weight of 2500 to DMF, the mass concentration of the polyurethane is 35%, stir for 8 hours at 60 ° C to fully dissolve, then divide it into three equal parts, and add one part to one of them. Add nickel acetate powder and ultrasonically disperse for 2 hours as core solution B; under the same process conditions, add cobalt acetate powder and manganese acetate powder to the other 2 parts of polyurethane solution, respectively, as core solution C and core solution D, Among them, the mass fraction of nickel acetate, cobal...
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Abstract
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