Operando X-ray absorption spectroscopy
investigations have been carried out to follow changes in the atomic
and electronic local structures of all three transition metals for
the Li1.20Mn0.54Co0.13Ni0.13O2 layered oxide during the first and second charges and
discharges of lithium batteries. The experiments were performed using
a Quick-XAS monochromator on the SAMBA beamline at Synchrotron SOLEIL
to record the three K-edges by edge-jumping between two energy ranges
([Mn, Co] and [Co, Ni]) every 3 min during the cycling of the battery.
The results obtained especially at the Mn K-edge fully support the
participation of oxygen in the reversible charge–discharge
reaction of this Li- and Mn-rich layered material as a redox center
and not only with oxygen loss, as was proposed previously.
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