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Mono‐Active Bimetallic Oxide Co 2 AlO 4 with Yolk‐Shell Structure as a Superior Lithium‐Storage Material
Author(s) -
Zeng Kewen,
Tan Lei,
Li Xinhai,
Wang Zhixing,
Guo Huajun,
Wang Jiexi,
Yan Guochun
Publication year - 2019
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201900594
Subject(s) - anode , bimetallic strip , materials science , lithium (medication) , electrochemistry , oxide , chemical engineering , shell (structure) , chemistry , composite material , electrode , metallurgy , metal , medicine , engineering , endocrinology
The mono‐active bimetallic oxide Co 2 AlO 4 with microsphere morphology and yolk‐shell structure are synthesized and first evaluated as anode materials for lithium ion batteries. The electrochemically inactive Al element disperse well in the material at an atomic‐scale level, which can effectively alleviate volume expansion during the cycling and heighten the electrochemical reaction kinetics. Moreover, the yolk‐shell structure provides adequate buffer space for volume expansion. Benefited from the synergy effect of the yolk‐shell structure and uniformly element Al distribution, the yolk‐shell Co 2 AlO 4 delivers a discharge capacity of 661 mAh g −1 at 1000 mA g −1 after 500 cycles with a capacity retention ratio of 86.4 %, and maintains a high discharge capacity of 548 mAh g −1 at 3200 mA g −1 , showing excellent long‐term cycle performance and rate capability.