RGO-Coated TiO2 Microcones for High-Rate Lithium-Ion Batteries

Reduced graphene oxide (RGO)-coated TiO2 microcones have been synthesized via simple lanodization and cyclic voltammetry for use in lithium-ion batteries (LIBs). Microcones had a perpendicularly oriented hollow core, an anatase structure, and a high surface area, allowing higher capacity than other nanosized TiO2 structures. TiO2 has low electrical conductivity, leading to the limitation of fast charging and high capacity; however, this was improved by the application of an RGO coating this work materials of LIB, the obtained RGO microcone showed a capacity of 157 mAh g(-1) at 10C (fully charged within similar to 360 s) and sustained 1000 cycles with only 0.02% capacity fading per cycle. The capacity was 1.5 times higher than that of conventional microcone. We speculated that the decrease in the charge transfer resistance (R-ct) played a crucial role in increasing the capacity with fast charging.