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Na 0.67 Mn (1‐ x ) Fe x O 2 Compounds as High‐Capacity Cathode Materials for Rechargeable Sodium‐Ion Batteries
Author(s) -
Siriwardena Dumindu P.,
Fernando Joseph F. S.,
Wang Tony,
Firestein Konstantin L.,
Zhang Chao,
Lewis CourtneyElyce,
Treifeldt Joel E.,
Golberg Dmitri V.
Publication year - 2021
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.202001297
Subject(s) - x ray photoelectron spectroscopy , electrochemistry , cathode , cyclic voltammetry , materials science , analytical chemistry (journal) , diffraction , spectroscopy , electrode , chemistry , chemical engineering , physics , quantum mechanics , engineering , optics , chromatography
Herein, we report on electrochemical and structural properties of low‐cost Na 0.67 Mn (1‐x) Fe x O 2 (NMF x ) cathode materials synthesized through substitution of Mn with small amounts of Fe. The materials were fabricated using a simple solid‐state synthesis method. Electrochemical performance of the cathodes was significantly improved when initial electrochemical activation had been performed. Activated Na 0.67 Mn 0.9 Fe 0.1 O 2 material displayed a high capacity of 132 mAh/g after 100 cycles and delivered an exceptionally high rate capability of 116 mAh/g at 500 mA/g. Energy‐dispersive X‐ray spectroscopy (EDX), cyclic voltammetry (CV) and ex situ X‐ray photoelectron‐spectroscopy (XPS) analyses suggested that Fe had played a structural as well as an electrochemical role in cathode performance. Ex situ and in situ X‐ray diffraction (XRD) studies were used to analyze the associated structural variations during the capacity evolution.