Electrochemical and structural evolution of structured V2O5 microspheres during Li-ion intercalation

With the development of stable alkali metal anodes, V2O5 is gaining traction as a cathode material due to its high theoretical capacity and the ability to intercalate Li, Na and K ions. Herein, we report a method for synthesizing structured orthorhombic V2O5 microspheres and investigate Li intercalation/deintercalation into this material. For industry adoption, the electrochemical behavior of V2O5 as well as structural and phase transformation attributing to Li intercalation reaction must be further investigated. Our synthesized V2O5 microspheres consisted of small primary particles that were strongly joined together and exhibited good cycle stability and rate capability, triggered by reversible volume change and rapid Li ion diffusion. In addition, the reversibility of phase transformation (alpha, epsilon, delta, gamma and omega-LixV2O5) and valence state evolution (5+, 4+, and 3.5+) during intercalation/de-intercalation were studied via in-situ X-ray powder diffraction and X-ray absorption near edge structure analyses. (C) 2020 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by ELSEVIER B.V. and Science Press. All rights reserved.