▎ 摘　　要

The development of advanced Li4Ti5O12 anode with high capacity and long cycle-life is a central issue for rechargeable Li-ion batteries. In this study, we report that a novel composite, nanosized Li4Ti5O12 particles supported by N-doped graphene sheets, has been successfully prepared by a facile and rapid strategy. Compared to the pure Li4Ti5O12 anode, improved electronic conductivity, higher flexibility and enhanced mechanical strength are demonstrated in N-doped graphene modified Li4Ti5O12. When used as anode materials for Li-ion batteries, the specific discharge capacities of the pure and N-doped graphene modified Li4Ti5O12 electrodes for the first cycle at a current density of 0.5 C between 1.0 and 2.5 V (vs. Li+/Li) are 163.6 and 171.2 mA h g(-1), respectively, and their capacity retentions over 100 cycles are 96.1% and 99.3%, respectively. Moreover, the high-rate capacities of N-doped graphene decorated anode are also much better than that of the pure Li4Ti5O12 at various current densities. Even at 40 C, it can still achieve a high reversible capacity of 136.9 mA h g(-1) and tolerate a long-term cycling with 1000 cycles. This design strategy provides a promising pathway for developing high-performance Li4Ti5O12 anode for Li-ion batteries. (C) 2016 Elsevier Ltd and Techna Group S.r.l. All rights reserved.