| 초록 |
Graphite is famous for an anode material in lithium-ion battery. However, the low theoretical capacity (372 mAh g-1) could not be satisfied with the demand of high energy density for electrical vehicles and devices. For this reason, graphene-metal oxide composite can be a solution to increase the capacity. Especially, SnO2 nanoparticles are a promising anode material for the lithium ion battery. Graphene-SnO2 (G-SnO2) can be synthesized by vacuum filtration and microwave. For example, reduced graphene oxide (rGO) and graphene oxide (GO) were uniformly dispersed in 2-propanol. The mixture was stirred with SnCl2 solution, and then a hydrogel was formed by vacuum filtration. Finally, the hydrogel transformed to the G-SnO2 through it was exposed to the microwave irradiation for 10min. The capacity of G-SnO2 showed around 1,000 mAh g-1 in 100 mA g-1 during 100 cycles, and maintained high specific capacity (746.8 mAh g-1) in high current density (300 mA g-1). In addition, properties of G-SnO2 were analyzed by SEM, TEM, XRD, XPS, TGA and cycle voltammetry. |
