Lithiation and delithiation induced magnetic switching and electrochemical studies in α-LiFeO2 based Li ion battery

In this work, lithium ferrite synthesized by designed solid-state method was presented, and physical chemistry and battery performance as anode were also studied. Rietveld refinement of the XRD pattern, shows that the diffraction peaks of lithium ferrite can be indexed to the cubic alpha-phase (Space group Fm-3m). Bond valence energy landscape mapping confirms two dimensional migration pathway of lithium. Effective magnetic moment of 0.55 mu(B) as calculated by Curie-Weiss law justifies the antiferromagnetic ordering for LiFeO2 after charge-discharge reaction. In addition, both the ex-situ XRD and SQUID magnetometry studies reveal a phase (morphology) transition upon the charge-discharge reaction for LiFeO2. The distribution function of relaxation times (DFRTs) analysis confirms that two types of Li ion migrations as originated due to the phase transition in the LiFeO2/lithium coin cell after charge-discharge reaction. Moreover, 4 cycles are needed for attaining capacity similar to 600 mAh/g at 0.1C rate. Our work clearly observed the phase (morphology) transition induced magnetic switching in alpha-LiFeO2 that provides in-sights into better understanding of the capacity change of electrode materials for the development of high-performance Li-ion battery. (C) 2021 Elsevier Ltd. All rights reserved.

Automated summary

"The study shows that lithium ferrite undergoes a phase (morphology) transition and magnetic switching after charge-discharge reaction; DFRTs analysis confirms two types of Li ion migrations; 4 cycles are needed to achieve a capacity similar to 600 mAh/g at 0.1C rate."