▎ 摘　　要

We report here the integration of high voltage Li3V2(PO4)(3)/C cathode material and nitrogen-doped graphene nanosheets, which has led to high-speed electron and Li-ion transfer channels. The hybrid materials are synthesized through a microwave-assisted hydrothermal method. The Li3V2(PO4)(3)/C with typical size of 50-100 nm are uniformly anchored on the nitrogen-doped graphene nanosheets. The hybrid nanocomposites as cathode material for lithium-ion batteries exhibit a specific discharge capacity of 191.5 mAh g (1) at 0.1C within the voltage range of 3.0-4.8 V; 172.6 mAh g (1) and 160.5 mAh g (1) at higher rates of 5C and 10C, respectively. More importantly, it shows a stable cycling performance with 87.3% capacity retention after 1000 cycles at 20C. Thus, we can speculate that the nitrogen-doped graphene decorated Li3V2(PO4)(3)/C is a promising cathode material for use in high-rate and ultralong cycle-life lithium-ion batteries. Meanwhile, this synthesis strategy and design conception for Li3V2(PO4)(3) could be employed to develop other cathode or anode materials for advanced energy storage. (C) 2016 Elsevier Ltd. All rights reserved.