Preparation method of sulfur/carbon composite cathode material for lithium-sulfur battery
A carbon composite material and cathode material technology, applied in the field of electrochemical applications, can solve problems such as poor adhesion between slurry and current collector, achieve good cycle performance, solve poor adhesion, and simple operation.
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Embodiment 1
[0019] (1) Preparation of sulfur / carbon composites:
[0020] Graphene, mesophase carbon microspheres and sublimed sulfur were mixed evenly at a ratio of 1:10 and 1:5 respectively. In a tube furnace, in an inert gas atmosphere, the temperature was raised at a heating rate of 10°C / min. Constant temperature at 155°C for 6 hours, then raise the temperature at a rate of 10°C / min, keep the temperature at 200°C for 2 hours, then increase the rate of temperature at 10°C / min, keep the temperature at 300°C for 2 hours, cool to room temperature, and obtain sulfur / mesophase carbon microspheres and sulfur / graphene composites.
[0021] (2) Preparation of transition layer:
[0022] Add the sulfur / mesophase carbon microsphere composite material to NMP (N-methylpyrrolidone), in a planetary ball mill, the ball-to-material ratio is 20:1, the speed is 300 rpm, ball milling for 4 hours, the ball milling can make the carbon / sulfur composites are more uniformly dispersed in NMP. Then add PVDF ...
Embodiment 2
[0027] (1) Preparation of sulfur / carbon composites:
[0028] Graphene, mesophase carbon microspheres and sublimed sulfur were mixed evenly at a ratio of 1:10 and 1:5 respectively. In a tube furnace, in an inert gas atmosphere, the temperature was raised at a heating rate of 10°C / min. Constant temperature at 155°C for 6 hours, then raise the temperature at a rate of 10°C / min, keep the temperature at 200°C for 2 hours, then increase the rate of temperature at 10°C / min, keep the temperature at 300°C for 2 hours, cool to room temperature, and obtain sulfur / mesophase carbon microspheres and sulfur / graphene composites.
[0029] (2) Preparation of transition layer:
[0030] The sulfur / mesophase carbon microsphere composite was added to NMP, magnetically stirred for 6 hours, placed in an ultrasonic oscillator with an ultrasonic power of about 100 W, and ultrasonically oscillated for 1 hour. Then add 1.25g PVDF and an appropriate amount of NMP to adjust the viscosity of the slurry,...
Embodiment 3
[0034] (1) Preparation of sulfur / carbon composites:
[0035] Graphene, mesophase carbon microspheres and sublimed sulfur were mixed evenly at a ratio of 1:10 and 1:5 respectively. In a tube furnace, in an inert gas atmosphere, the temperature was raised at a heating rate of 10°C / min. Constant temperature at 155°C for 6 hours, then raise the temperature at a rate of 10°C / min, keep the temperature at 200°C for 2 hours, then increase the rate of temperature at 10°C / min, keep the temperature at 300°C for 2 hours, cool to room temperature, and obtain sulfur / mesophase carbon microspheres and sulfur / graphene composites.
[0036] (2) Preparation of transition layer:
[0037]The sulfur / mesophase carbon microsphere composite material: PVDF:SP was added to NMP according to the ratio of 7:1:2, magnetically stirred for 6 hours, placed in an ultrasonic oscillator with an ultrasonic power of about 200 W, and ultrasonically oscillated for 1 hour. After magnetic stirring for 2 hours, the s...
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