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Lattice‐Cell Orientation Disorder in Complex Spinel Oxides
Author(s) -
Chen Yan,
Cheng Yongqiang,
Li Juchuan,
Feygenson Mikhail,
Heller William T.,
Liang Chengdu,
An Ke
Publication year - 2017
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201601950
Subject(s) - materials science , spinel , electrochemistry , crystal structure , intercalation (chemistry) , cathode , chemical physics , oxide , lattice (music) , phase transition , electrode , condensed matter physics , crystallography , inorganic chemistry , chemistry , metallurgy , physics , acoustics
Transition metal (TM) substitution has been widely applied to change complex oxides crystal structures to create high energy density electrodes materials in high performance rechargeable lithium‐ion batteries. The complex local structure in the oxides imparted by the TM arrangement often impacts their electrochemical behaviors by influencing the diffusion and intercalation of lithium. Here, a major discrepancy is demonstrated between the global and local structures of the promising high energy density and high voltage LiNi 0.5 Mn 1.5 O 4 spinel cathode material that contradicts the existing structural models. A new single‐phase lattice‐cell orientation disorder model is proposed as the mechanism for the local ordering that explains how the inhomogeneous local distortions and the coherent connection give rise to the global structure in the complex oxide. Further, the single‐phase model is consistent with the electrochemical behavior observation of the materials.