Original Layered OP4-(Li,Na) x CoO2 Phase: Insights on Its Structure, Electronic Structure, and Dynamics from Solid State NMR

The OP4-(Li/Na)_xCoO₂ phase is an unusual lamellar oxide with a 1:1 alternation between Li and Na interslab spaces. In order to probe the local structure, electronic structure, and dynamics, ⁷Li and ²³Na magic angle spinning nuclear magnetic resonance (MAS NMR) spectroscopy was performed in complementarity to X-ray diffraction and electronic and magnetic properties measurements. ⁷Li MAS NMR showed that NMR shifts result from two contributions: …