빠른 충방전속도와 안정된 사이클을 가진 리튬이온 배터리의 음극재용 RGO@TiO2

초록

초 록 : Currently, commercialized graphite in the field of batteries has some shortcomings such as low theoretical capacity and dendrite formation during fast charging. Therefore, many researchers have developed new electrode materials to enhance performance of Li ion battery (LIB). Among them, titanium oxide is considered as an alternative electrode to overcome graphite's shortcomings in terms of dendrite formation and stability. In previous study, we synthesized TiO2 microcones, which shows 3 times higher capacity than that of TiO2 nanotubes in a negative electrode for Li-ion batteries. In this study, to order to overcome relatively low capacity and conductivity of electrode, graphene oxide (GO) was coated on TiO2 microcones via electrophoresis, and then subsequently it was reduced to reduced-graphene oxide (rGO) via facile cyclic voltammetry (CV). It was clearly confirmed from SEM images that the morphology of TiO2 mircrocones was not changed even after coating and reducing process. As a result, rGO was successfully coated on TiO2 microcones confirmed by TEM images. As the negative electrode in LIB, the obtained RGO@TiO2 showed a capacity of 157 mAh g-1 at 10 C and sustained 1000 cycles with only 0.02 % capacity fading per cycle. The capacity was 1.5 times higher than conventional TiO2 microcones.