Silicon-carbon material with multilayered core-shell structure as well as preparation method and application
A technology of silicon carbon material and core-shell structure, applied in the direction of nanotechnology, structural parts, secondary batteries, etc. for materials and surface science, can solve the problem of weakening the contact between materials and conductive agents, affecting battery cycle life, SEI film change, etc. Thickness and other issues, to achieve the effect of reducing polarization and volume change, small energy loss, and weakening volume change
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Embodiment 1
[0039] A method for preparing a silicon-carbon material with a multi-layered core-shell structure, comprising the following steps:
[0040](1) Prepare a sucrose solution with a molar concentration of 1.5 mol / L, put the obtained solution in a reactor for hydrothermal reaction at 190°C for 5 hours, filter and wash the obtained reaction product until the pH of the filtrate is 7, and dry the filtered product at 60°C , to obtain carbon microspheres with a diameter of 5 μm;
[0041] (2) Prepare tetraethyl silicate into a 3mol / L ethanol solution; mix the two together with a volume ratio of carbon microspheres:silicon solution of 1:1, and ultrasonically assist for 0.5h to make the silicon source Able to enter the carbon spheres, the obtained sample was left to stand for 24 hours to fully infiltrate the carbon microspheres; then, it was washed with deionized water and filtered until the filtrate pH=7, and the obtained filtrate was roasted in an Ar atmosphere (heating rate 2°C / min, ca...
Embodiment 2
[0043] A method for preparing a silicon-carbon material with a multi-layered core-shell structure, comprising the following steps:
[0044] (1) Prepare a glucose solution with a molar concentration of 3 mol / L, and place the obtained solution in a reactor for hydrothermal reaction at 200°C for 24 hours. Filter and wash the resulting reaction product until the filtrate pH=7, and dry the filtrate at 120°C to obtain carbon microspheres with a diameter of 10 μm;
[0045] (2) Prepare tetraethyl silicate as a 5mol / L methanol solution. The volume ratio of carbon microspheres:silicon solution is 1:10 and the two are mixed together, assisted by ultrasound for 3 hours, so that the silicon source can enter the carbon spheres, and the obtained sample is allowed to stand for 72 hours, so that the carbon microspheres are fully infiltrated. Subsequently, wash with deionized water, filter to filtrate pH=7, gained filtrate is in N 2 Calcination was carried out under atmosphere (heating rate 1...
Embodiment 3
[0047] A method for preparing a silicon-carbon material with a multi-layered core-shell structure, comprising the following steps:
[0048] (1) Commercial 0.5 μm carbon microspheres were used as the hard templating agent, 5 g of carbon microspheres were placed in concentrated sulfuric acid with a concentration of 18 mol / L, heated and refluxed at 100 ° C for 24 hours, the obtained samples were filtered and washed to the pH of the filtrate =7, after drying the filtrate at 120°C, the treated carbon microspheres were obtained;
[0049] (2) Prepare tetraethyl silicate as a 0.1mol / L methanol solution. Mix the two together with the volume ratio of carbon microspheres:silicon solution at a ratio of 1:5, and ultrasonically assist for 3 hours, so that the silicon source can enter the carbon spheres, and the obtained sample is allowed to stand for 72 hours, so that the carbon microspheres are fully infiltrated; Subsequently, wash with deionized water, filter the filtrate to pH = 7, and ...
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