Li₃Fe₂(HPO₃)₃Cl: An Electroactive Iron Phosphite as a New Polyanionic Cathode Material for Li-Ion Battery
A novel lithium containing iron-chlorophosphite, Li3Fe2(HPO3)3Cl has been synthesized by employing low melting phosphorous acid flux. The single-crystal X-ray structure determination established that the compound has a 3-dimensional structure built up by edge-shared octahedral dimers and phosphite moieties that create narrow channels along the a- and b-axis. Two crystallographically independent Li ions are located in those channels. The compound was further characterized by TGA, IR, magnetic measurements, and Mössbauer spectroscopy. Magnetic measurements indicate that the compound has a field-induced metamagnetic transition. In this article we report for the first time an iron chloro-phosphite, Li3Fe2(HPO3)3Cl, as a new polyanion-based cathode with a promising electrochemical activity that shows an average voltage of 3.1 V vs. Li+/Li for the Fe2+/Fe3+ redox couple and a reversible capacity of 70 mA h g-1. Details of electrochemical studies including cyclic voltammetry, galvanostatic charge-discharge, and electro-impedance spectroscopy are reported here.
H. Yaghoobnejad Asl et al., "Li₃Fe₂(HPO₃)₃Cl: An Electroactive Iron Phosphite as a New Polyanionic Cathode Material for Li-Ion Battery," Journal of Materials Chemistry A, vol. 3, no. 14, pp. 7488-7497, Royal Society of Chemistry, Apr 2015.
The definitive version is available at https://doi.org/10.1039/c5ta00208g
Keywords and Phrases
Cathodes; Crystal structure; Cyclic voltammetry; Electric batteries; Electric discharges; Electrochemical impedance spectroscopy; Electrodes; Iron; Iron compounds; Lithium; Magnetic variables measurement; Secondary batteries; Single crystals; 3-dimensional structures; Electro impedance spectroscopies; Electrochemical activities; Electrochemical studies; Field induced metamagnetic transitions; Galvanostatic charge discharges; Single crystal x-ray structures; Ssbauer spectroscopies; Lithium-ion batteries
International Standard Serial Number (ISSN)
Article - Journal
© 2015 Royal Society of Chemistry, All rights reserved.
01 Apr 2015