Ultrafine Li3V2(PO4)3 crystals adhered to P-doped graphene sheets for electrochemical lithium storage

Li3V2(PO4)3 has been regarded as an advanced cathode for energy storage because of its various advantages. Nevertheless, the pristine Li3V2(PO4)3 suffers from a low electrical conductivity which prevents its practical application. In this research, we demonstrate a simple hydrothermal method to synthesize the P-doped graphene-decorated Li3V2(PO4)3 to enhance the poor electrical conductivity for the first time. Due to the ultrafine Li3V2(PO4)3 crystals and the conducting P-doped graphene networks, the as-fabricated composite shows outstanding lithium storage performances for energy storage. It exhibits the high reversible capacities of 188.6 and 149.6 mAh g−1 at 0.2 and 10 °C between 3.0 and 4.8 V, as well as the stable cycling property with a high capacity retention of 96.9% after 100 cycles at 2 °C. As a result, this facile approach described here can be used to fabricate other electrodes for electrochemical energy storage.