Synthesis of carbon coated L_i3V_2(PO_4)_3/reduced graphene oxide composite for high-performance lithium ion batteries

摘要

The carbon coated Li_3V_2(P0_4)-3/reduced graphene oxide (LVP@C/rGO) composite is successfully synthesized by a conventional solid-state reaction, which is easily scaled up. LVP grains coated with a thin layer (~8 nm) of carbon are adhered to the surface of the rGO layer and/or enwrapped into the rGO sheets, which can facilitate the fast charge transfer within the whole electrode and to the current collector. As a cathode material, the LVP@>C/rGO electrode delivers an initial discharge capacity of 177 mAh g~(-1) at 0.5 C with capacity retention of 96% during the 50th cycle in a wide voltage range of 3.0-4.8 V. A superior rate capability is also achieved, e.g., exhibiting a discharge capacity of 96 mAh g~(-1) at a high C rate of 10C.