Article
Extended Data Fig. 4 | Manganese L-edge spectra and low-resolution RIXS
for Na0.6[Li0.2Mn0.8]O 2. a, Electrochemical load curve for first cycle of
Na0.6[Li0.2Mn0.8]O 2 showing state of charge points selected for ex situ analysis.
b, Manganese L-edge data collected in inverse partial f luorescence yield mode
show that Na0.6[Li0.2Mn0.8]O 2 remains unchanging at Mn4+ throughout the
charge and discharge cycle. Standards shown below are MnO (+2), Mn 2 O 3 (+3)
and Li 2 MnO 3 (+ 4). c, Low-resolution RIXS spectra collected at BL27SU, Spring8
synchrotron, Japan, at 531 eV excitation energy show a new feature at an
emission energy of approximately 523 eV corresponding to new hole states
formed on O and an increase in the elastic peak intensity (labelled with arrows).
These new features disappear on discharge indicating O reduction, and the
spectra are almost superimposable with those collected for the pristine
material. The intensity of both features appears much less pronounced than
the O redox features measured on honeycomb-ordered O-redox materials.