Study of the Lithium Diffusion Properties of (Mgconilizn)O High Entropy Oxide as an Anode in Lithium-Ion Battery

Abstract

High-entropy oxide (HEO) based materials have recently significant attention as a conversion type anode material for lithium-ion batteries (LIBs) due to the high specific capacity, cycling stability and rate capability. However, the diffusion kinetics of HEO based anodes for conversion reactions, which occur during the charge and discharge processes have been not studied deeply in the literature. Therefore, the diffusion properties of lithium in the HEO electrodes need to be studied in detail. In this work, the (MgCoNiLiZn)O HEO anode was synthesized by conventional solid-state method. The obtained HEO sample was characterized structurally by X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques. The XRD analysis show that the HEO sample has been successfully synthesized with a single-phase rock-salt structure. The lithium diffusion properties of HEO sample were investigated by various electrochemical techniques including electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV).