Resonant photoemission spectroscopy of the cathode material LixMn0.5Fe0.5PO4 for lithium-ion battery

► We reveal the element-specific electronic structure of LixMn0.5Fe0.5PO4. ► Changes in the Fe 3d states of LixMn0.5Fe0.5PO4 are identical with those of LixFePO4. ► Mn 3d states of LixMn0.5Fe0.5PO4 remain unchanged through the charge reaction.