A Li-S battery separator of graphene-cobalt nitride and preparation method thereof
A graphene and cobalt nitride technology, applied in battery pack parts, separators/films/diaphragms/spacers, circuits, etc., can solve the problem of polysulfide shuttle in Li-S batteries, effectively suppressing, lack of nitrogen Effective doping of atoms, lack of chemical bond formation between nitrogen atoms and polysulfides, etc., to achieve excellent chemical stability, improve battery specific capacity, and improve cycle stability.
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Embodiment 1
[0038] GO was added to water and ultrasonically crushed for 15 minutes to obtain GO aqueous solution (0.4wt%, 40mL), then an aqueous solution of cobalt chloride (3wt%, 8mL) was added, magnetically stirred, and ultrasonically crushed to make graphene oxide-cobalt ions (GO- co 3+ ) layers are separated to obtain GO-Co 3+ solution; the above GO-Co 3+ Add dimethylimidazole aqueous solution (5wt%, 8mL) to the solution, magnetically stir for 5min, let stand for 50min, suction filter, and freeze-dry to obtain the Co-2MIM / GO compound. 3 , the ventilation time is 1.0h to discharge excess oxygen in the tube furnace. Set the initial temperature to 50°C, raise the temperature at a rate of 5°C / min for 110 minutes to raise the temperature in the furnace to 600°C, and maintain the temperature for 4 hours for nitriding. After the nitriding is completed, the temperature in the furnace drops below 100°C to obtain graphene - cobalt nitride compounds.
[0039]The obtained compound and ethanol...
Embodiment 2
[0041] GO was added to water and ultrasonically crushed for 15min to obtain GO aqueous solution (0.7wt%, 50mL), then an aqueous solution of cobalt chloride (6wt%, 12mL) was added, magnetically stirred, and ultrasonically crushed to make graphene oxide-cobalt ions (GO- co 3+ ) layers are separated to obtain GO-Co 3+ solution; the above GO-Co 3+ Add dimethylimidazole aqueous solution (10wt%, 12mL) to the solution, magnetically stir for 8min, let stand for 50min, suction filter, and freeze-dry to obtain the Co-2MIM / GO compound. 3 1h, to discharge excess oxygen in the tube furnace. Set the initial temperature to 50°C, raise the temperature at a rate of 5°C / min for 130 minutes to 700°C, and maintain the temperature for 3 hours for nitriding. After the nitriding is completed, the temperature in the furnace drops below 100°C to obtain a graphene-cobalt nitride compound .
[0042] The obtained compound was prepared into a 0.2 mg / mL solution with an ethanol solution, and ultrasoni...
Embodiment 3
[0044] The graphene oxide compound was placed in a tube furnace, pre-passed with NH 3 , the ventilation time is 1.0h to discharge the excess oxygen in the tube furnace. Set the initial temperature to 50°C, raise the temperature to 600°C at a rate of 5°C / min, hold for 3 hours for nitriding, and after the nitriding is completed, the temperature in the furnace drops below 100°C to obtain graphene nitride. The compound was mixed with ethanol solution to form a 0.3 mg / mL solution, and ultrasonicated for 2.0 h to obtain a uniformly dispersed graphene / ethanol solution. The uniformly dispersed graphene / ethanol solution is filtered with PP as a filter membrane, and vacuum-dried to obtain the required graphene / PP battery separator, which has a diameter of 2.0 cm and a thickness of 29.8 μm.
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