Preparation of a spinel LiMn2O4 single crystal film from a MnO wafer

► Single crystalline spinel LiMn2O4 film was prepared from MnO wafer. ► LiMn2O4(100), (110) and (111) films were formed on MnO(100), (110) and (111) wafers. ► Atomically flat terraces with steps of a minimum height of about 0.5 nm were confirmed on the (111) film surface. ► Prepared (111) film showed two-steps charge-discharge voltage profile that is typical electrochemical behavior of LiMn2O4.