Slight compositional variation-induced structural disorder-to-order transition enables fast Na+ storage in layered transition metal oxides

Abstract

In layered transition metal oxides as cathode active materials for Na-ion batteries, Na+ diffusion kinetics are impacted by Na+/vacancy ordering. Here, the authors suggest that the P2-type Na2/3Ni1/3Mn2/3O2 with large zigzag ordering exhibits high Na+ mobility and thus superior rate capability.