The need for new electrode materials in nonaqueous batteries feeds ever increasing interest, especially in these last 2 decades. Numerous families of oxides have been proposed as attractive electrode materials. (1) However, though lithium is not so expensive for these applications, its large scale utilization will become rapidly limited due to the rather small number of natural lithium sources over the world. Thus, sodium, which is an abundant element, should be the best candidate for the next generation of batteries. Owing to these concerns, investigations on transition metal oxides as cathode materials for sodium-ion batteries have re-emerged recently.