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Electrochemical and Structural Study of Layered P2‐Type Na 2/3 Ni 1/3 Mn 2/3 O 2 as Cathode Material for Sodium‐Ion Battery
Author(s) -
Wen Yanfen,
Wang Bei,
Zeng Guang,
Nogita Kazuhiro,
Ye Delai,
Wang Lianzhou
Publication year - 2015
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201403134
Subject(s) - electrochemistry , cathode , materials science , sodium ion battery , sodium , analytical chemistry (journal) , battery (electricity) , diffraction , manganese , ion , stoichiometry , phase (matter) , precipitation , electrode , chemistry , metallurgy , faraday efficiency , power (physics) , physics , organic chemistry , chromatography , quantum mechanics , meteorology , optics
P2‐type Na 2/3 Ni 1/3 Mn 2/3 O 2 was synthesized by a controlled co‐precipitation method followed by a high‐temperature solid‐state reaction and was used as a cathode material for a sodium‐ion battery (SIB). The electrochemical behavior of this layered material was studied and an initial discharge capacity of 151.8 mA h g −1 was achieved in the voltage range of 1.5–3.75 V versus Na + /Na. The retained discharge capacity was found to be 123.5 mA h g −1 after charging/discharging 50 cycles, approximately 81.4 % of the initial discharge capacity. In situ X‐ray diffraction analysis was used to investigate the sodium insertion and extraction mechanism and clearly revealed the reversible structural changes of the P2‐Na 2/3 Ni 1/3 Mn 2/3 O 2 and no emergence of the O2‐Ni 1/3 Mn 2/3 O 2 phase during the cycling test, which is important for designing stable and high‐performance SIB cathode materials.