Extended Data Fig. 11: XANES of Li₂Mn_1/2Ti_1/2O₂F.

a, b, Manganese K-edge XANES spectra of Li₂Mn_1/2Ti_1/2O₂F: before cycle (black), 120 mAh g⁻¹ charged (navy), 240 mAh g⁻¹ charged (wine), 400 mAh g⁻¹ charged (grey), 330 mAh g⁻¹ discharged after a 400 mAh g⁻¹ charge (dark yellow). c–e, First derivatives of normalized absorbance at the pre-edge region of Mn K-edge spectra of Li₂Mn_1/2Ti_1/2O₂F: c, before cycle and after first charging to 400 mAh g⁻¹ then discharging to 330 mAh g⁻¹; d, after first charging to 120 mAh g⁻¹; and e, to 240 mAh g⁻¹ and 400 mAh g⁻¹. f, Titanium K-edge XANES spectra of Li₂Mn_1/2Ti_1/2O₂F during the initial cycle. Data from MnO, Mn₂O₃, MnO₂, Ti₂O₃ and TiO₂ are presented for comparison. Detailed explanations of the results are given in Methods section ‘Supplementary Note 6’.