N-doped TiO2/rGO hybrids as superior Li-ion battery anodes with enhanced Li-ions storage capacity

摘要

In this article, nitrogen is successfully doped into both components of TiO2/reduced graphene oxide composites via a hydrothermal-post thermal treatment. The N-doped TiO2/reduced graphene oxide electrode presents obviously higher Li-ion storage performance (270 mAh g(-1) at current density of 0.1 A g(-1)) than the undoped product. This N-doped composite could also exhibit superior long-term cycling stability with a reversible capacity of 210 mAh g(-1) even after 2000 cycles. Further electrochemical analysis finds the number of active Li-ions is increased from the formation of N-Ti-O and N-C bonds, which greatly improves the charge/discharge process in the anode for lithium-ion batteries. This work may improve understanding of the doping effects of various elements present in electrode materials. (C) 2019 Elsevier B.V. All rights reserved.