Accurate Quantification of TiO2(B)’s Phase Purity via Raman Spectroscopy

Bronze phase titanium dioxide (TiO 2 (B)) could be a promising high-power anode for lithium ion battery. However, TiO 2 (B) is a metastable material, so the as-synthesized samples are inevitably accompanied by the existence of anatase phases. It has been found that the TiO 2 (B)’s purity is positively correlated with its electrochemical performance. Herein, we have established an accurate quantification of the TiO 2 (B)/anatase ratio, by figuring out the function between the purity of TiO 2 (B) phase in the high purity range and its Raman spectra features in combination of the calibration by the synchrotron radiation X-ray diffraction (XRD). Compared with the time-consuming electrochemical method, the rapid, sensitive and non-destructive features of Raman spectroscopy have made it a promising candidate for determining the purity of TiO 2 (B). Further, the correlations developed in this work should be instructive in synthesizing pure TiO 2 (B) and furthermore optimizing its electrochemical charge storage properties. • The purity of TiO 2 (B) affects its electrochemical performance in battery as a promising anode material. • The purity function of TiO 2 (B) established by Raman spectrum is calibrated by Synchrotron radiation XRD, realizing the accurate, ease, rapid and non-destructive determination of purity. • The purity function of TiO 2 (B) established by electrochemical method can provide a more reliable result compared with the most commonly used Thomas Beuvier's approach.