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Manganese Metaphosphate Mn(PO3)2 as a High‐Performance Negative Electrode Material for Lithium‐Ion Batteries
Ist Teil von
ChemElectroChem, 2020-07, Vol.7 (13), p.2831-2837
Ort / Verlag
Weinheim: Wiley Subscription Services, Inc
Erscheinungsjahr
2020
Link zum Volltext
Quelle
Wiley Online Library
Beschreibungen/Notizen
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.
Smart coating: A new negative conversion electrode material, manganese (II) metaphosphate Mn(PO3)2 synthesized by a facile solid‐state method is reported here. After carbon‐coating, it delivers a high reversible capacity in Li‐ion batteries. The reaction mechanism is investigated with a combination of ex situ X‐ray absorption spectroscopy, in situ X‐ray diffraction, and high‐resolution transmission electron microscopy.