Manganese metaphosphate Mn(PO3)2 as a high‐performance negative electrode material for lithium‐ion batteries
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Date
2020-06-15
Journal Title
Journal ISSN
Volume Title
Publisher
Wiley
Abstract
We report a novel negative conversion electrode material, manganese (II) metaphosphate Mn(PO3)2. This compound can be synthesized by a facile solid-state method, and after carbon-coating delivers an attractively high reversible capacity of 477 mAh/g at 0.1 C and 385 mAh/g at 1 C. We investigated the reaction mechanism with a combination of ex situ X-ray absorption spectroscopy, in situ X-ray diffraction, and high-resolution transmission electron microscopy. We observed a direct conversion process by monitoring the first discharge in operando, in which Mn(PO3)2 reacts with Li to give fusiform Mn nanograins a few Ångstroms in width, embedded in a matrix of lithium conducting LiPO3 glass. Due to the fine nanostructures of the conversion products, this conversion reaction is completely reversible. © 1999-2021 John Wiley & Sons, Inc.
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Keywords
Electrodes, Manganese, Transmission electron microscopy, X-ray diffraction, Lithium, Lithium ion batteries
Citation
Xia, Q., Naeyaert, P. J. P., Avdeev, M., Schmid, S., Liu, H., Johannessen, B., & Ling, C. D. (2020). Manganese metaphosphate Mn(PO3)2 as a high‐performance negative electrode material for lithium‐ion batteries. ChemElectroChem, 7(13), 2831-2837. doi:10.1002/celc.202000389