AUTHOR=Senguttuvan Premkumar , Lee Eungje , Key Baris , Johnson Christopher S. 

TITLE=Synthesis, structural and electrochemical properties of V4O9 cathode for lithium batteries

JOURNAL=Frontiers in Chemistry

VOLUME=Volume 11 - 2023

YEAR=2023

URL=https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2023.1161053

DOI=10.3389/fchem.2023.1161053

ISSN=2296-2646

ABSTRACT=Single-phase three-dimensional vanadium oxide (V4O9) was synthesized by reduction of V2O5 using a gas stream of ammonia/argon (NH3/Ar). The as-synthesized oxide, prepared by this simple gas reduction method was subsequently electrochemically transformed into a disordered rock salt type-“Li3.7V4O9” phase while cycling over the voltage window 3.5 to 1.8 V versus Li.  The Li-deficient phase delivers an initial reversible capacity of ~260 mAhg-1 at an average voltage of 2.5 V vs. Li+/Li. Further cycling to 50 cycles yields a steady 225 mAhg-1. Ex situ X-ray diffraction studies confirmed that (de)intercalation phenomena follows a solid-solution electrochemical reaction mechanism. As demonstrated, the reversibility and capacity utilization of this V4O9 is found to be superior to V2O5 cathodes in lithium cells.