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Enhanced Electrochemical Performance in Ni‐Doped LiMn 2 O 4 ‐Based Composite Cathodes for Lithium‐Ion Batteries
Author(s) -
Deng Yunlong,
Mou Jirong,
Wu Huali,
Zhou Lin,
Zheng Qiaoji,
Lam Kwok Ho,
Xu Chenggang,
Lin Dunmin
Publication year - 2017
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201600823
Subject(s) - spinel , materials science , non blocking i/o , lithium (medication) , doping , electrochemistry , impurity , composite number , cathode , analytical chemistry (journal) , lithium ion battery , metallurgy , composite material , electrode , battery (electricity) , chemistry , catalysis , medicine , biochemistry , optoelectronics , organic chemistry , chromatography , endocrinology , power (physics) , physics , quantum mechanics
High‐voltage and high‐performance Ni‐doped LiMn 2 O 4 ‐basedcomposite cathodes have been obtained from the nominal formula of Li 2 Mn 1‐ x Ni x SiO 4 , synthesized by using a citric acid‐assisted sol‐gel method. The spinel Li(Mn,Ni) 2 O 4 and layered Li 2 SiO 3 coexist in the composites with x =0 and 0.05, whereas the materials with x =0.15 and 0.25 consist of Li(Mn,Ni) 2 O 4 , Li 2 SiO 3 and layered LiNiO 2 ; at x ≥ 0.35, the impurity phases of NiO and Ni 6 MnO 8 are detected. A significant improvement in discharge capacity and rate performance of the materials has been caused by the simultaneous existence of LiNiO 2 and Li 2 SiO 3 . The composite with x =0.25 givesa very high initial discharge capacity of 168 mAh g −1 in the potential range of 3–5 V and exhibits an excellent rate performance. Our study shows that the composites consisting of Li(Mn , Ni) 2 O 4 , Li 2 SiO 3 , and LiNiO 2 may be promising candidates for high‐voltage and high‐performance lithium‐ion batteries.