▎ 摘　　要

We report the design and synthesis of a novel hierarchical LiCoPO4@C/G cathode material, consisting of carbon coated LiCoPO4 nanoparticles crosslinked by wrinkled graphene, for high-energy-density lithium ion batteries. This material is facilely prepared by a solid-state milling process followed by heat annealing. Its morphology and structure are characterized by scanning electron microscopy, transmission electron microscopy, Raman spectroscopy and X-ray diffraction. It is revealed that the LiCoPO4 nano particles are coated by an amorphous carbon layer with similar to 3 nm thickness and further crosslinked by wrinkled graphene. The LiCoPO4@C/G material delivers a high discharge capacity of 146.1 mAh g(-1) at 0.1 C rate and 93.0 mAh g(-1) at 2 C rate. The enhanced electrochemical properties are attributed to the nanosized LiCoPO4 particles and the high electronic conductivity resulted from the synergistic carbon coating and graphene crosslinking. Our work provides a facile approach to prepare high performance LiCoPO4 cathode materials for lithium ion batteries. (C) 2015 Elsevier B.V. All rights reserved.