Lithiation and delithiation induced magnetic switching and electrochemical studies in α-LiFeO2 based Li ion battery. (May 2021)

• Record Type: Journal Article
• Authors: Su, K.H.; Chi, P.W.; Paul, T.; Chung, C.H.; Chen, W.M.; Su, Y.S.; Wu, P.M.; Su, C.Y.; Wu, M.K.
• Is Part Of: Materials today physics. Volume 18(2021)
• Publication Date: 2021-05
• Subjects: Li-ion battery -- Anode -- Magnetic oxides -- SQUID -- Distribution function of relaxation times; Materials science -- Periodicals; Physics -- Periodicals; Electronic journals; 530.41
• DOI: 10.1016/j.mtphys.2021.100373
• Languages: English
• ISSNs: 2542-5293

Abstract

Abstract: 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 α-phase (Space group Fm-3m). Bond valence energy landscape mapping confirms two dimensional migration pathway of lithium. Effective magnetic moment of 0.55 μB 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 ∼600 mAh/g at 0.1C rate. Our work clearly observed the phase (morphology) transition induced magnetic switching in α-LiFeO2 that provides insights into better understanding of the capacity change of electrode materials for the development of high-performance Li-ion battery. Graphical abstract: Our study investigates the well know iron oxide material when experiencing lithiation-delithiation processes. X-ray diffraction profiles obtained after several lithiation-delithiation cycles are shown for α-LiFeO2 . The peaks of α-LiFeO2 and Li2 O are marked. From these modifications to the cubic structure the magnetic behavior can be switched from ferromagnetic to antiferromagnetic. The Crystal structure of α-LiFeO2 (right inset) along with LiO6 octahedral unit; the left inset provides a picture of conduction pathways of lithium ions. Red: Oxygen, Green/white/brown: Li/Fe(1)/Fe(2). Image 1 Highlights: Cubic α-LiFeO2 anode based Li-ion batteries are fabricated. 2-D Li-ion migration pathway is found using bond-valence sum calculations. Antiferromagnetic ordering is found after cycling. Specific capacity of ∼600 mAhg −1 is achieved. Two types of Li ion migration are identified in SEI layers using DFRT analysis.