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Mg 2+ and Ti 4+ Co–Doped Spinel LiMn 2 O 4 as Lithium‐Ion Battery Cathode
Author(s) -
Yang Zengrong,
Wang Yujie,
Chen Xianchun,
Wu Hao,
Zhang Yun
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.201902685
Subject(s) - spinel , manganese , materials science , valence (chemistry) , cathode , lithium (medication) , dissolution , doping , microstructure , ion , inorganic chemistry , chemistry , metallurgy , medicine , optoelectronics , organic chemistry , endocrinology
Herein, Mg 2+ and Ti 4+ co‐doped spinel LiMn 2 O 4 lithium‐ion cathode material was prepared via a simple high‐temperature solid‐state route, presenting the high specific capacity, upgraded cyclability, and enhanced rate capability contemporaneously. The introduction of Mg 2+ reducing the relative content of Mn 3+ in the LiMn 2 O 4 material could not only well restrain the Jahn‐Teller effect due to the average‐valence increment of manganese, but also highly maintain the stability of cubic spinel structure upon cycling by virtue of stronger bond energy of Mg−O compared with Mn−O. What's more, Ti 4+ doping with a replacement of Mn 4+ increases the lattice parameter of LiMn 2 O 4 which could facilitate the insertion and deinsertion of Li + , and could also offer a positive effect to suppress the dissolution of manganese via changing the surface microstructure of material. Therefore, the co‐doped LiMn 2 O 4 electrode exhibits a high Li + storage capacity (124 mAh g −1 at 0.1 C), good capacity‐retention rate (97% after 100 cycles at 5 C), enhanced rate capability (85 mAh g −1 at 5 C) and improved cycling performance (80 mAh g −1 after 100 cycles at 5 C).