FTIR SPECTROSCOPY OF METAL-OXIDE INSERTION MATERIALS - ANALYSIS OF LIXMN2O4 SPINEL ELECTRODES

Fourier transform infrared (FTIR) spectra were obtained from spinel-ty pe lithium manganese oxides of composition LixMn2O4 With 0 < x < 2.4, prepared by both chemical and electrochemical means. Each phase in thi s system has a distinct spectrum which is characteristic of the local (short-range) structure. Mixtures of phases were analyzed using the me thod of scaled absorbance subtraction. The results correlate well with previously reported XRD and neutron diffraction analyses as well as w ith phase behavior indicated by electrochemical measurements. FTIR spe ctroscopy thus provides both qualitative and quantitative information and is shown to be an effective companion technique to X-ray diffracti on. Copyright (C) 1997 Elsevier Science Ltd.