Preparation method of hard carbon composite carbon microsphere negative electrode material for lithium or sodium ion battery
A technology of composite carbon and polymer materials, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems of poor battery performance, adhesion and agglomeration, and foaming, and achieve easy control of the operation process and complete coating Membrane improvement, energy saving effect
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Embodiment 1
[0040] Add 0.5g of graphene oxide and 9.5g of water-soluble starch into 323ml of deionized water, and obtain a spray liquid with a solid content of 3wt% after ultrasonication at 20kHz for 45min; use a spray dryer to spray the obtained spray liquid to self-assemble to obtain starch / graphene oxide composite carbon microsphere precursor, the parameters in the spraying process are: the air inlet temperature is 120°C, the fan frequency is 60Hz, and the feed rate is 500ml / h; the obtained starch / graphene oxide composite carbon microsphere precursor The body was placed in a corundum crucible, put into a tube furnace under the protection of nitrogen, and kept at a high temperature of 700 ° C for 2 hours to make the starch pyrolyze and carbonize, and then obtain composite carbon microspheres. The scanning electron micrograph of the figure 1 shown. Depend on figure 1 It can be seen that the prepared samples are graphene oxide coated on the surface of the microspheres, which are monod...
Embodiment 2
[0043]Add 1g of graphene oxide and 9g of water-soluble starch into 323ml of deionized water, and use a powerful ultrasonic machine to sonicate at 20kHz for 60min to obtain a spray liquid with a solid content of 3wt%; use a spray dryer to spray the obtained spray liquid for self-assembly The starch / graphene oxide composite carbon microsphere precursor was obtained, and the parameters during the spraying process were: the air inlet temperature was 120°C, the fan frequency was 60Hz, and the feed rate was 500ml / h; the obtained starch / graphene oxide composite carbon microspheres The spherical precursor was placed in a corundum crucible, placed in a tube furnace under the protection of nitrogen, and kept at a high temperature of 900 °C for 3 hours to pyrolyze and carbonize the starch to obtain composite carbon microspheres. The scanning electron micrograph of the Figure 5 shown by Figure 5 It can be seen that the graphene oxide sample prepared in Example 2 is coated on the surfac...
Embodiment 3
[0046] Add 1g of graphene oxide and 9g of asphalt to 323ml of N,N-2-methylformamide, and use a powerful ultrasonic machine to ultrasonicate at 20kHz for 60min to obtain a spray liquid with a solid content of 3wt%; the obtained spray liquid is spray-dried Spray and self-assemble the pitch / graphene oxide composite carbon microsphere precursor. The parameters during the spraying process are: the air inlet temperature is 180°C, the fan frequency is 60Hz, and the feed rate is 500ml / h; the obtained pitch / graphene oxide The precursor of graphene composite carbon microspheres was placed in a corundum crucible, then placed in a tube furnace under the protection of nitrogen, and kept at a high temperature of 900°C for 3 hours to pyrolyze and carbonize the pitch to obtain composite carbon microspheres. Micrographs such as Figure 9 shown by Figure 9 It can be seen that the graphene oxide sample prepared in Example 3 is coated on the surface of the microspheres, and the composite carbon...
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