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Electrochemical Performance of Iron‐doped Li 1.2 Mn 0.6 Ni 0.2 O 2 Cathode Materials Prepared by Combustion Synthesis
Author(s) -
Zhang Dongyan,
Li Zhimin,
Li Gaofeng,
Zhang Maolin,
Yan Yangxi
Publication year - 2019
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201903321
Subject(s) - electrochemistry , materials science , cathode , faraday efficiency , doping , manganese , equiaxed crystals , combustion , chemical engineering , anode , ion , grain size , nanotechnology , metallurgy , electrode , microstructure , chemistry , optoelectronics , engineering , organic chemistry
Li‐rich manganese cathode materials have increasingly attracted much attention because of their high specific capacities applied in Li‐ion batteries. However, they have suffered from low coulombic efficiency and poor rate capability. In this study, we utilize Fe ion doping and control grain morphology to improve the electrochemical performance of Li 1.2 Mn 0.6 Ni 0.2 O 2 . Fe‐doped Li 1.2 Mn 0.6 Ni 0.2 O 2 powders were successfully prepared via combustion synthesis, with equiaxed appearance and submicron size. The electrochemical measurement demonstrated that through Fe doping, a high discharging capacity of 192.0 mAh⋅g −1 was achieved for the sample at the rate of 1 C, and the cyclic stability and rate capacity were significantly enhanced compared. Further investigations illustrated that Fe ions manifested electrochemical activity during lithiation and delithiation, and enabled to stabilize hexagonal structure of the sample and enlarge the crystal interlayer spacing. It is the synergistic effect that endows the doped sample more specific capacity and high cyclic and rate performance.