Structural and Electrochemical Analyses on the Transformation of CaFe₂O₄-Type LiMn₂O₄ from Spinel-Type LiMn₂O₄.

ABSTRACT: Lithium manganese oxides have received much attention as positive electrode materials for lithium-ion batteries. In this study, a post-spinel material, CaFe₂O₄-type LiMn₂O₄ (CF-LMO), was synthesized at high pressures above 6 GPa, and its crystal structure and electrochemical properties were examined. CF-LMO exhibits a one-dimensional (1D) conduction pathway for Li ions, which is predicted to be superior to the three-dimensional conduction pathway for these ions. The stoichiometric LiMn₂O₄ spinel (SP-LMO) was decomposed into three phases of Li₂MnO₃, MnO₂, and Mn₂O₃ at 600 °C and then started to transform into the CF-LMO structure above 800 °C. The rechargeable capacity (<

SUBMITTER: Mukai K 

PROVIDER: S-EPMC6648083 | biostudies-literature | 2019 Apr

REPOSITORIES: biostudies-literature