Lithium-sulfur battery composite positive electrode active material and preparation and application thereof
A composite cathode and active material technology, applied in battery electrodes, lithium storage batteries, nanotechnology for materials and surface science, etc., can solve problems such as adsorption, reduce liquid-sulfur ratio, lower carbon content, and improve electrical performance. Effect
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Embodiment 1
[0064] 5 kg of starch, 5 kg of 100nm SiO 2 Add template dispersion liquid and 50 grams of sodium dodecylsulfonate to 10 L of deionized water, stir at 80°C for 5 hours, dry the slurry at 120°C, pulverize the dried slurry, and Carburize in a carbonization furnace at 800°C for three hours in an atmosphere; the carbonized product is washed with 10M sodium hydroxide solution at a temperature of 100°C to remove SiO 2 Template; wash repeatedly with deionized water until the pH of the washing solution is neutral. Then dry the carbon material and mix 2 kg of ammonium metavanadate and 2 kg of selenium powder, ball mill at 300 rpm for 3 hours, then heat-treat the mixed powder at 600 degrees for 2 hours in argon atmosphere pyrolysis furnace , the heating rate is 5°C / min. The porous carbon vanadium selenide composite material can be obtained. The pore volume of the material is 2.24cm 3 / g, the specific surface area is 1468m 2 / g, the porous carbon material pore diameter is mainly conc...
Embodiment 2
[0067] Compared with Example 1, the main difference is that the temperature of the carbon preparation process is changed, specifically:
[0068] 5 kg of starch, 5 kg of 100nm SiO 2 Add template dispersion liquid and 50 grams of sodium dodecylsulfonate to 10 L of deionized water, stir at 80°C for 5 hours, dry the slurry at 120°C, pulverize the dried slurry, and Carburize in a carbonization furnace at 1200°C for three hours in an atmosphere; the carbonized product is washed to remove SiO with 10M sodium hydroxide solution at a temperature of 100°C 2 Template; wash repeatedly with deionized water until the pH of the washing solution is neutral. Then dry the carbon material and mix 2 kg of ammonium metavanadate and 2 kg of selenium powder, ball mill at 300 rpm for 3 hours, then heat-treat the mixed powder at 600 degrees for 2 hours in argon atmosphere pyrolysis furnace , the heating rate is 5°C / min. The porous carbon vanadium selenide composite material can be obtained. The po...
Embodiment 3
[0071] Compared with Example 1, the main difference is that the size of the template in the carbon preparation process is changed, specifically:
[0072] 5 kg of starch, 5 kg of 500nm SiO 2 Add template dispersion liquid and 50 grams of sodium dodecylsulfonate to 10 L of deionized water, stir at 80°C for 5 hours, dry the slurry at 120°C, pulverize the dried slurry, and Carburize in a carbonization furnace at 1200°C for three hours in an atmosphere; the carbonized product is washed to remove SiO with 10M sodium hydroxide solution at a temperature of 100°C 2 Template; wash repeatedly with deionized water until the pH of the washing solution is neutral. Then dry the carbon material and mix 2 kg of ammonium metavanadate and 2 kg of selenium powder, ball mill at 300 rpm for 3 hours, then heat-treat the mixed powder at 600 degrees for 2 hours in argon atmosphere pyrolysis furnace , the heating rate is 5°C / min. The porous carbon vanadium selenide composite material can be obtained...
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