A boron-rich eggshell type lithium-sulfur battery positive electrode material, preparation method and application thereof
A technology for lithium-sulfur batteries and positive electrode materials, applied in battery electrodes, lithium batteries, non-aqueous electrolyte batteries, etc., can solve the problems of volume expansion, fragmentation, and different density of sulfur positive electrodes, and achieve simple control, regular shape, and effective Adsorption effect
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Embodiment example 1
[0044] At room temperature, mix ammonia water, ethanol, and deionized water with a mass fraction of 15% in a volume ratio of 1:30:20, add 3ml of tetraethyl silicate, and control the reaction at 30°C for 1 hour to obtain Mixture A. Then, continue to add 3ml of tetraethyl silicate and an equal volume of octadecyltrimethylsilane to the mixed solution A, stir the reaction for 1 hour, and keep it at room temperature for 3 hours to obtain the mixed solution B, centrifuge the mixed solution B, and wash the solid Drying and calcining at 500°C for 7h to obtain a silica template a;
[0045] Prepare a boric acid aqueous solution with a mass fraction of 15%, ultrasonically treat it for 15 minutes, mix fructose, concentrated sulfuric acid, and the product a obtained in the first step into the boric acid aqueous solution in a ratio of 7:1:7, and ultrasonically react for 1 hour to obtain a mixed solution C.
[0046] Put the mixture C in an oil bath, heat at 100°C for 12h, and at 160°C for 1...
Embodiment example 2
[0053] At room temperature, mix ammonia water, ethanol, and deionized water with a mass fraction of 20% in a volume ratio of 3:30:17, add 4ml of tetraethyl silicate, and control the reaction at 40°C for 1.5h. Mixture A was obtained. Then, continue to add 5ml of tetraethyl silicate and an equal volume of octadecyltrimethylsilane to the mixed solution A, stir the reaction for 2 hours, keep it at room temperature for 5 hours, and obtain the mixed solution B, centrifuge the mixed solution B, and wash the solid Drying and calcining at 700°C for 5h to obtain a silica template a;
[0054] Prepare a boric acid aqueous solution with a mass fraction of 20%, ultrasonically treat it for 20 minutes, mix fructose, concentrated sulfuric acid, and the product a obtained in the first step into the boric acid aqueous solution in a ratio of 7:1:7, and ultrasonically react for 2 hours to obtain a mixed solution C.
[0055] The mixture C was placed in an oil bath, heated at 130°C for 13h and at 1...
Embodiment example 3
[0062] At room temperature, mix ammonia water, ethanol, and deionized water with a mass fraction of 17% in a volume ratio of 4:35:15, add 3.7ml of tetraethyl silicate, and control the reaction at 45°C for 1 hour. Mixture A was obtained. Then, continue to add 3.7ml of tetraethyl silicate and an equal volume of octadecyltrimethylsilane to the mixed solution A, stir the reaction for 1 hour, and keep it at room temperature for 4 hours to obtain the mixed solution B, which is centrifuged and the solid washing and drying at 600°C for 4 hours to obtain a silica template a;
[0063] Prepare a boric acid aqueous solution with a mass fraction of 17%, ultrasonically treat it for 30 minutes, mix fructose, concentrated sulfuric acid, and the product a obtained in the first step into the boric acid aqueous solution in a ratio of 7:1:7, and ultrasonically react 2. 5h, the mixture C was obtained.
[0064] The mixture C was placed in an oil bath, heated at 125°C for 15h and then at 170°C for...
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Abstract
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