V2O3–Li3PO4 Composite: A New Type of Cathodic Active Material for Li‐Ion Batteries

• Published in: Advanced materials interfaces Vol. 9; no. 13
• Main Authors: Tang, Anping, Liang, Ziqin, Chen, Hezhang, Xu, Guorong, Song, Haishen
• Format: Journal Article
• Language: English
• Published: Weinheim John Wiley & Sons, Inc 01.05.2022
• Subjects: cathodes; Electric potential; Lithium; Lithium-ion batteries; Li‐ion batteries; Photoelectrons; surface conversion reaction; V 2O 3–Li 3PO 4 composite; Vanadium oxides; Voltage
• DOI: 10.1002/admi.202101955
• ISSN: 2196-7350

A new type of cathodic active material for lithium‐ion batteries based on a composite of Li3PO4 and V2O3 is proposed in this work. Although the V2O3 component is almost inactive in the voltage range of 2–4.5 V versus Li+/Li, the mixture of the two components can deliver a larger reversible specific capacity of ≈190 mA h g−1 in the voltage range of 2–4.5 V at a current density of 15 mA g−1. X‐ray photoelectron spectroscopy data and cyclic voltammetry data suggest that the vanadium ions are probably oxidized and reduced repetitively upon cycling and that the V3+ ions are partially oxidized to V4+ and even V5+ ions during charging to 4.5 V. This distinctive lithium‐ion uptake and release phenomenon, in which Li3PO4 functions as a lithium source of surface conversion reaction, will introduce a new path for designing unique cathodic active materials for lithium‐ion batteries. V2O3–Li3PO4 composite, based on surface conversion reaction, has been used for the first time as a cathodic active material for Li‐ion batteries, introducing a new path for designing unique cathodic materials. The V3+ ions are partially oxidized to V4+ and even V5+ ions during charging to 4.5 V. The vanadium ions are probably oxidized and reduced repetitively upon cycling.