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

Y. Yokoyama; D. Ootsuki; T. Sugimoto; H. Wadati; J. Okabayashi; Xu Yang; Fei Du; Gang Chen; T. Mizokawa

doi:10.1063/1.4927239

paper

Electronic structure of Li $_{1 + x}$ [Mn $_{0.5}$ Ni $_{0.5}$ ] $_{1 - x}$ O $_{2}$ studied by photoemission and x-ray absorption spectroscopy

arXiv:1505.01612 · doi:10.1063/1.4927239

Abstract

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

4 pages, 5 figures

Electronic structure of Li1+x​[Mn0.5​Ni0.5​]1−x​O2​ studied by photoemission and x-ray absorption spectroscopy

Abstract

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Electronic structure of Li $_{1 + x}$ [Mn $_{0.5}$ Ni $_{0.5}$ ] $_{1 - x}$ O $_{2}$ studied by photoemission and x-ray absorption spectroscopy