Facile Synthesis and Electrochemical Investigation of Li9V3 (P2O7)3(PO4)2 as High Voltage Cathode for Li-Ion Batteries

We report about a cost-effective synthesis approach for obtaining layered lithium vanadium monodiphosphate Li9V3(P2O7)(3)(PO4)(2) (LVPP) as cathode material for lithium-ion batteries. This polyanionic cathode framework can exchange more than one electron per transition metal at high potentials versus lithium. The influence of crystallite size, carbon coating and working potential window on the electrochemical performance of Li9V3(P2O7)(3)(PO4)(2) is reported. The extraction of nearly 5 Li+ ions during the first cycle between 2 and 4.8 V is reached for LVPP with crystallite size of 40 nm and 4.4% carbon coating. A stable reversible specific capacity of 115 mA h g(-1) is achieved when cycled between 2 and 4.8 V. (C) The Author(s) 2016. Published by ECS. This is an open access article distributed under the terms of the Creative Commons Attribution Non-Commercial No Derivatives 4.0 License (CC BY-NC-ND, http://creativecommons.org/licenses/by-nc-nd/4.0/), which permits non-commercial reuse, distribution, and reproduction in any medium, provided the original work is not changed in any way and is properly cited. For permission for commercial reuse, please email: oa@electrochem.org. All rights reserved.