Spray-drying synthesis of P2-Na2/3Fe1/2Mn1/2O2 with improved electrochemical properties

Owing to its high theoretical capacity, P2-type Na_2/3Fe_1/2Mn_1/2O₂ has been considered as a kind of promising cathode material. However, the practical application is limited due to excessively high calcining temperature during traditional preparation processes. Here, we report the synthesis of P2-Na_2/3Fe_1/2Mn_1/2O₂ by using a facile spray-drying method followed by calcining at low temperature. Under the optimal conditions, the well-crystallized P2-Na_2/3Fe_1/2Mn_1/2O₂ material with excellent rate capability and cycle ability is obtained. And the sample exhibits the initial discharge capacities of 217.9, 171.3 and 117.4 mAh g⁻¹ at 0.1 C, 0.5 C and 2 C rate, respectively. The developed Na_2/3Fe_1/2Mn_1/2O₂ material, synthesized by a new spray drying-calcining procedure, may potentially be used as a suitable cathode in sodium ion batteries.