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A NASICON‐Type Positive Electrode for Na Batteries with High Energy Density: Na 4 MnV(PO 4 ) 3
Author(s) -
Chen Fan,
Kovrugin Vadim M.,
David Rénald,
Mentré Olivier,
Fauth François,
Chotard JeanNoël,
Masquelier Christian
Publication year - 2019
Publication title -
small methods
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 4.66
H-Index - 46
ISSN - 2366-9608
DOI - 10.1002/smtd.201800218
Subject(s) - analytical chemistry (journal) , gravimetric analysis , fast ion conductor , electrode , electrochemistry , cathode , materials science , battery (electricity) , ionic bonding , chemistry , ion , inorganic chemistry , electrolyte , power (physics) , physics , organic chemistry , chromatography , quantum mechanics
The mixed Mn 2+ /V 3+ Na‐super‐ionic‐conductor (NASICON) cathode material Na 4 MnV(PO 4 ) 3 is prepared by solid‐state reaction at 800 °C under argon. When used as a positive electrode in Na batteries, this material can exchange three electrons for two transition metals, that is, yielding a high gravimetric capacity of 156 mAh g −1 on charge when the upper cutoff voltage is set to 4.3 V versus Na + /Na. Operando X‐ray diffraction during battery operation is performed and it is shown that the mechanisms of Na + insertion/extraction are single or biphasic depending on the electrochemical cycling conditions.