title: Migration of Mn cations in delithiated lithium manganese oxides.
abstract: Li2MnO3 is an integrated component in lithium-manganese-rich nickel manganese cobalt oxides, and the conversion of Li2MnO3 to a spinel-like structure after electrochemical activation has been associated with the continuous potential decay of the material. Delithiated Li2MnO3 and delithiated LiMn2O4 were used as model materials to investigate the mechanism of forming the spinel-like structure. An in situ high-energy X-ray diffraction technique was used to trace the structural change of materials at elevated temperatures, a procedure to mimic the structural transformation during the normal cycling of batteries. It was also found that the migration of Mn atoms from the octahedral sites to tetrahedral sites is the key step for phase transformation from a monoclinic structure to a spinel structure.
authors.affiliation: State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China. yuanhu@ustc.edu.cn.
authors.forename: Yongchun
authors.initials: Y
authors.lastname: Kan
authors.forename: Yuan
authors.initials: Y
authors.lastname: Hu
authors.forename: Chi-Kai
authors.initials: CK
authors.lastname: Lin
authors.forename: Yang
authors.initials: Y
authors.lastname: Ren
authors.forename: Yang-Kook
authors.initials: YK
authors.lastname: Sun
authors.forename: Khalil
authors.initials: K
authors.lastname: Amine
authors.forename: Zonghai
authors.initials: Z
authors.lastname: Chen