Figure 5: Crystal and electronic structure evolution during electrochemical desodiation and sodiation.

In situ XRD patterns collected during the first charge/discharge of the Na/Na0.6[Cr0.6Ti0.4]O2 cells under a current rate of C/5 at voltage ranges of 0.5–2.5 V (a) and 2.5–3.85 V (b). EELS for Cr-L2,3 (c) and Ti-L2,3 (d) edges for the pristine Na0.6[Cr0.6Ti0.4]O2 sample and the Na0.6[Cr0.6Ti0.4]O2 electrodes charged to 3.85 V and discharged to 0.5 V, respectively.