EXAFS analysis of LiFePO4 and Li4Ti5O12 samples produced via chemical technique

► We made a method to treat EXAFS obtaining oscillations by the variation principle. ► The new EXAFS treatment method estimates both the Fourier window limits. ► Composition of two LiFePO4 and one Li4Ti5O12 samples is studied via EXAFS method. ► Both the LiFePO4 samples may contain several percent of other substances. ► The Li4Ti5O12 sample may contain about one half of anatase TiO2.