Hemispherical hollow titanium dioxide/carbon particle/polyaniline-supported sulfur composite material and preparation method, lithium-sulfur battery positive electrode and battery
A technology of titanium dioxide and composite materials, applied in battery electrodes, secondary batteries, non-aqueous electrolyte battery electrodes, etc., can solve problems such as poor cycle performance, fast capacity decay, and poor rate performance, so as to improve conductivity and improve battery performance , the effect of high sulfur loading
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Embodiment 1
[0047]A preparation method of a hemispherical hollow titanium dioxide / carbon particle / polyaniline loaded sulfur composite material, comprising the following steps:
[0048] 1) Hydrothermal process: 10mL of absolute ethanol and 20mL of isopropanol were stirred and mixed evenly. After adding 0.2mL tetrabutyl titanate and stirring for 10min, put the mixed solution in an oven, and invert at a constant temperature of 150°C for 12 hours. After the reaction, the precipitate was collected, centrifuged, washed, and vacuum-dried at 40°C for 18 hours to obtain titanium dioxide. Material;
[0049] 2) Composite process: Take 0.2g of the titanium dioxide material prepared in step 1) in 50mL of deionized water, add 0.3g of Tris (Tris), add hydrochloric acid to adjust the pH to 6.5, add 45mg of dopamine hydrochloride, and react for 18 hours. After the reaction, the product was taken out, centrifuged, washed alternately with deionized water and ethanol, and vacuum-dried at 40° C. for 20 hours...
Embodiment 2
[0054] A preparation method of a hemispherical hollow titanium dioxide / carbon particle / polyaniline loaded sulfur composite material, comprising the following steps:
[0055] 1) Hydrothermal process: 15mL of absolute ethanol and 20mL of isopropanol, stir and mix evenly, then add 0.4mL tetrabutyl titanate and stir for 10min, put the mixed solution in an oven, and react at a constant temperature of 160°C for 10 hours , after the reaction is completed, the precipitate is collected, centrifuged, washed, and vacuum-dried at 50° C. for 16 hours to obtain a titanium dioxide material;
[0056] 2) Composite process: Take 0.2g of the titanium dioxide material prepared in step 1) and disperse it in 50mL of deionized water, add 0.8g of Tris (Tris), add hydrochloric acid to adjust the pH to 7.5, add 55mg of dopamine hydrochloride, and react for 22 hours After the reaction, the product was taken out, centrifuged, washed alternately with deionized water and ethanol, and vacuum-dried at 55°C f...
Embodiment 3
[0061] A preparation method of a hemispherical hollow titanium dioxide / carbon particle / polyaniline loaded sulfur composite material, comprising the following steps:
[0062] 1) Hydrothermal process: 20mL of absolute ethanol and 10mL of isopropanol, stir and mix evenly, then add 0.5mL tetrabutyl titanate and stir for 10min, put the mixed solution in an oven, and react at a constant temperature of 180°C for 8 hours After the reaction, the precipitate was collected, centrifuged, washed, and vacuum-dried at 60°C for 12 hours to obtain a titanium dioxide material, whose SEM was as follows: figure 1 As shown, it can be seen from the figure that it is a hemispherical hollow shape with a smooth surface and a particle size of 2 μm;
[0063] 2) Composite process: Take 0.2g of the titanium dioxide material prepared in step 1) and disperse it in 50mL of deionized water, add 1.2g of Tris (Tris), add hydrochloric acid to adjust the pH to 8.5, add 60mg of dopamine hydrochloride, and react fo...
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