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Manganese Metaphosphate Mn(PO 3 ) 2 as a High‐Performance Negative Electrode Material for Lithium‐Ion Batteries
Author(s) -
Xia Qingbo,
Naeyaert Pierre J. P.,
Avdeev Maxim,
Schmid Siegbert,
Liu Hongwei,
Johannessen Bernt,
Ling Chris D.
Publication year - 2020
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.202000389
Subject(s) - metaphosphate , manganese , materials science , lithium (medication) , electrode , transmission electron microscopy , inorganic chemistry , analytical chemistry (journal) , chemical engineering , chemistry , nanotechnology , metallurgy , medicine , organic chemistry , phosphate , chromatography , endocrinology , engineering
We report a novel negative conversion electrode material, manganese (II) metaphosphate Mn(PO 3 ) 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(PO 3 ) 2 reacts with Li to give fusiform Mn nanograins a few Ångstroms in width, embedded in a matrix of lithium conducting LiPO 3 glass. Due to the fine nanostructures of the conversion products, this conversion reaction is completely reversible.