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A Cobalt‐Free Li(Li 0.16 Ni 0.19 Fe 0.18 Mn 0.46 )O 2 Cathode for Lithium‐Ion Batteries with Anionic Redox Reactions
Author(s) -
Cheng Xiaolu,
Wei Hezhuan,
Hao Weijian,
Li Huiyu,
Si Huinan,
An Shengli,
Zhu Wentao,
Jia Guixiao,
Qiu Xinping
Publication year - 2019
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201802436
Subject(s) - cobalt , lithium (medication) , oxidation state , redox , x ray photoelectron spectroscopy , inorganic chemistry , cathode , cobalt oxide , oxygen , ion , chemistry , lithium cobalt oxide , materials science , catalysis , lithium ion battery , battery (electricity) , chemical engineering , medicine , power (physics) , physics , organic chemistry , quantum mechanics , engineering , endocrinology , biochemistry
Lithium‐rich, Mn‐based layered oxides Li 2 MnO 3 ‐LiMO 2 (M=Ni, Co) have been considered as promising cathode candidates owing to their high capacity. However, the resources shortage and high price of cobalt make it imperious to substitute cobalt with other high‐abundance elements. Here, we synthesized a low‐cost, cobalt‐free, Fe‐substituted oxide material, Li(Li 0.16 Ni 0.19 Fe 0.18 Mn 0.46 )O 2 . It exhibited a high reversible capacity of 169.2 mAh g −1 after 100 cycles and maintained an extraordinarily high discharge potential during cycling. X‐ray photoelectron spectroscopy and DFT calculations revealed that super iron Fe IV exists in the delithiated state, and oxygen participates in the redox reaction in addition to the Ni 2+ /Ni 4+ and Fe 3+ /Fe 4+ redox couples. The anionic oxidation preferentially occurred on oxygen with a Li−O−Li configuration and with oxidized Fe and Ni coordination.