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We have studied the electronic structure ofLi$_{1+x}$[Mn$_{0.5}$Ni$_{0.5}$]$_{1-x}$O$_2$ ($x$ = 0.00 and 0.05), one of thepromising cathode materials for Li ion battery, by means of x-ray photoemissionand absorption spectroscopy. The results show that the valences of Mn and Niare basically 4+ and 2+, respectively. However, the Mn$^{3+}$ component in the$x$ = 0.00 sample gradually increases with the bulk sensitivity of theexperiment, indicating that the Jahn-Teller active Mn$^{3+}$ ions areintroduced in the bulk due to the site exchange between Li and Ni. TheMn$^{3+}$ component gets negligibly small in the $x$ = 0.05 sample, whichindicates that the excess Li suppresses the site exchange and removes theJahn-Teller active Mn$^{3+}$.

Electronic structure of Li$_{1+x}$[Mn$_{0.5}$Ni$_{0.5}$]$_{1-x}$O$_2$ studied by photoemission and x-ray absorption spectroscopy