P4Nb2O15@CNTs: A New Type of Niobium Phosphate Compositing Carbon Nanotube Used as Anode Material for High-Rate Lithium Storage

For the past few years, intercalation-type niobium-based oxides have attracted tremendous attention due to their excellent electrochemical performance, but their rate performance and stability still need to be improved. Here, we synthesized P4Nb2O15 by a simple solvothermal method, used it as anode material in lithium-ion batteries for the first time, and further prepared P4Nb2O15@CNTs on the basis of previous research. The results indicated that P4Nb2O15@CNTs delivered a high reversible lithium storage capacity (563.3 mAh g–1 at 0.1C), with excellent rate performance (115.9 mAh g–1 at a high rate of 50C) and outstanding cycle performance of 0.0178% of capacity lost per cycle after 500 cycles at 10C. Moreover, it showed a significant interlayer pseudocapacitive contribution of 88.5% at 1.0 mV s–1. All of these advantages indicate that P4Nb2O15@CNTs have a wide application prospect as anode material in lithium-ion batteries.