A preparation method of graphitized mesocarbon microsphere anode material with controlled surface oxidation
A technology of mesophase carbon microspheres and graphitization, which is used in carbon preparation/purification, battery electrodes, electrochemical generators, etc., can solve the problem of insufficient GMCMB specific capacity, etc., to promote ion transport and increase lithium storage potential. point, the effect of ensuring the bulk density
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Embodiment 1
[0025] Measure 150mL H 2 SO 4 and 180 mL HNO 3 Place in a round bottom flask with a volume of 500 mL, stir for 5 min and mix well. Weigh 8g of graphitized mesocarbon microspheres, add them into the mixed acid, and ultrasonicate for 20min. Then add 3gCrO to the mixture 3 , stirred at a temperature of 40° C. for 7 h. After the reaction was completed, it was cooled to room temperature and filtered to obtain a black solid. Use 5% hydrochloric acid solution to wash five times, then wash repeatedly with distilled water until neutral, and dry at 80°C in a vacuum environment. The dried black solid was then placed in a quartz tube furnace. Introduce argon as a protective gas, the gas flow rate is 100mL / min, with 10 o The heating rate of C / min was raised from room temperature to 800°C, kept for 10 minutes, and then rapidly cooled to room temperature to obtain a calcined product. The obtained calcined product is collected and set aside.
[0026] The morphology of graphitized int...
Embodiment 2
[0035] Measure 130mL H 2 SO 4 and 200 mL HNO 3 Place in a round bottom flask with a volume of 500 mL, stir for 5 min and mix well. Weigh 8g of graphitized mesocarbon microspheres, add them into the mixed acid, and ultrasonicate for 20min. Then add 5gCrO to the mixture 3 , stirred at a temperature of 40° C. for 7 h. After the reaction was completed, it was cooled to room temperature and filtered to obtain a black solid. Use 5% hydrochloric acid solution to wash five times, then wash repeatedly with distilled water until neutral, and dry at 80°C in a vacuum environment. The dried black solid was then placed in a quartz tube furnace. Argon was introduced as a protective gas, the gas flow rate was 200mL / min, and the temperature was raised from room temperature to 950°C at a rate of 10°C / min, kept for 15 minutes, and then rapidly cooled to room temperature to obtain a calcined product. The obtained calcined product is collected and set aside.
Embodiment 3
[0037] Measure 150mL H 2 SO 4 and 100 mL H 3 PO 4 Place in a round bottom flask with a volume of 500 mL, stir for 10 min and mix well. Weigh 5 g of graphitized mesocarbon microspheres, add them into the mixed acid, and ultrasonicate for 20 min. Then add 2g CrO to the mixture 3 , Stirring at a temperature of 60° C. for 24 h. After the reaction was completed, it was cooled to room temperature and filtered to obtain a black solid. Use 10% hydrochloric acid solution to wash five times, then wash repeatedly with distilled water until neutral, and dry in a vacuum environment at a temperature of 80°C. The dried black solid was then placed in a quartz tube furnace. Helium was introduced as a protective gas, the gas flow rate was 150mL / min, the temperature was raised from room temperature to 1000°C at a heating rate of 15°C / min, kept for 10 minutes, and then rapidly cooled to room temperature to obtain a calcined product. The obtained calcined product is collected and set aside...
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