TiO2 nanotubes wrapped with reduced graphene oxide as a high-performance anode material for lithium-ion batteries.

ABSTRACT: Through electrostatic interaction and high-temperature reduction methods, rGO was closely coated onto the surface of TiO2 nanotubes. Even at a high temperature of 700?°C, the nanotube morphology of TiO2 (anatase) was preserved because of the assistance of rGO, which provides a framework that prevents the tubes from breaking into particles and undergoing a phase transformation. The rGO/TiO2 nanotubes deliver a high capacity (263?mAh g-1 at the end of 100 cycles at 0.1?A g-1), excellent rate performance (151?mAh g-1 at 2?A g-1 and 102?mAh g-1 at 5?A g-1), and good cycle stability (206?mAh g-1 after 500 cycles at 0.5?A g-1). These characteristics arise from the GO/TiO2 nanotubes' advanced structure. First, the closely coated rGO and Ti3+ in the tubes give rise to a high electro-conductivity of the nanotubes. Additionally, the Li+ ions can rapidly transfer into the electrode via the nanotubes' empty inner diameter and short tube wall.

SUBMITTER: Zheng P 

PROVIDER: S-EPMC5093559 | biostudies-literature | 2016 Nov

REPOSITORIES: biostudies-literature