A kind of composite micro-nano hollow fiber material and its preparation method and application
A fiber material and carbon nanofiber technology, which is applied in the field of composite micro-nano hollow fiber materials and their preparation, can solve the problems of consumption of metal lithium, reduction of cycle efficiency of metal lithium negative electrodes, short circuit of positive and negative electrodes of batteries, etc., to prevent excessive deposition, Enhances fast charging capability and inhibits growth
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Embodiment 1
[0048] Example 1 : Preparation of carbon micro-nano hollow fiber materials wrapped with nickel-cobalt alloy hollow nano-prisms
[0049] Dissolve polyvinylpyrrolidone (number-average molecular weight: 40000) and nickel acetate and cobalt acetate mixture with nickel-cobalt element molar ratio of 1:2 in ethanol at 25°C, the mass fraction of polyvinylpyrrolidone in the mixed solution is 1.5%, nickel The mass fraction of cobalt acetate is 1%, and the obtained mixed solution is heated to 65° C. to react for 1 hour, and the product is the nickel-cobalt-based acetate hydroxide precursor. Its scanning electron microscope pictures are as figure 1 shown by figure 1 It can be seen that the particle length of the nickel-cobalt-based acetate hydroxide precursor is about 1.3 μm, and the width is about 0.3 μm;
[0050] Disperse the nickel-cobalt-based acetate hydroxide precursor and polyacrylonitrile in N,N-dimethylformamide respectively, and mix the two precursor solutions to obtain a sp...
Embodiment 2
[0052] Example 2 : Wrapped with Ni 5 CoS 4 Preparation of carbon micro-nano hollow fiber materials with hollow nano-prisms
[0053] Dissolve polyvinylpyrrolidone (number average molecular weight: 40000) and a mixture of nickel acetate and cobalt acetate with a nickel-cobalt element molar ratio of 5:1 in ethanol at 22°C. The mass fraction of polyvinylpyrrolidone in the mixed solution is 2%, nickel The mass fraction of cobalt acetate is 1.5%, and the obtained mixed solution is heated to 85° C. to react for 1 hour, and the product is the nickel-cobalt-based acetate hydroxide precursor. The product particle length size is about 1 μm, and the width size is about 0.5 μm;
[0054] Disperse the nickel-cobalt-based acetate hydroxide precursor and polyacrylonitrile in N,N-dimethylformamide respectively, and mix the two precursor solutions to obtain a spinning solution, wherein the nickel-cobalt-based acetic acid The mass fraction of the salt hydroxide precursor and polyacrylonitril...
Embodiment 3
[0056] Example 3 : Wrapped with NiCo 2 Preparation of carbon micro-nano hollow fiber materials with P hollow nano-prisms
[0057] Dissolve polyvinylpyrrolidone (number-average molecular weight: 40000) and nickel acetate and cobalt acetate mixture with nickel-cobalt element molar ratio of 1:2 in ethanol at 21 ° C, the mass fraction of polyvinylpyrrolidone in the mixed solution is 1.5%, nickel The mass fraction of cobalt acetate is 1.5%, and the obtained mixed solution is heated to 45° C. for 4 hours to react, and the product is the nickel-cobalt-based acetate hydroxide precursor. The product particle length size is about 1.2 μm, and the width size is about 0.2 μm;
[0058] Disperse the nickel-cobalt-based acetate hydroxide precursor and polyacrylonitrile in N,N-dimethylformamide respectively, and mix the two precursor solutions to obtain a spinning solution, wherein the nickel-cobalt-based acetic acid The mass fraction of the salt hydroxide precursor and polyacrylonitrile i...
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