In situ ~(57)Fe Moessbauer Investigation of Solid-State Redox Reactions of Lithium Insertion Electrodes for Advanced Batteries

摘要

A novel in situ electrochemical cell for ~(57)Fe Moessbauer measurements was developed in order to clarify the mechanisms of solid-state redox reactions in lithium insertion materials containing iron. Our in situ Moessbauer technique was successfully applied to the determination as to which transition metal ion was a redox center in the insertion electrodes, such as LiFe_(0.5)Mn_(1.5)O_4, LiFeTiO_4, or LiFe_(0.25)Ni_(0.75)O_2, for the lithium-ion batteries.