Effects of Transition-Metal Mixing on Na Ordering and Kinetics in Layered P2 Oxides

Many of us use lithium-ion batteries every day, and sodium-ion cells could be even better, once the kinks have been worked out. Layered oxides with formula Na$M$O${}_{2}$ and $P2$ stacking seem promising here, yet suffer from limited capacity and cycling, so combinations of transition metals $M$ are pursued. The authors' simulations provide a rational framework to tune transition-metal mixing for optimal sodium diffusivity and enhanced rate capability in this class of cathode materials.