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

摘要

Owing to its high theoretical capacity, P2-type Na2/3Fe1/2Mn1/2O2 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 P2Na(2/3)Fe(1/2)Mn(1/2)O(2) by using a facile spray-drying method followed by calcining at low temperature. Under the optimal conditions, the well-crystallized P2-Na2/3Fe1/2Mn1/2O2 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 Na2/3Fe1/2Mn1/2O2 material, synthesized by a new spray drying-calcining procedure, may potentially be used as a suitable cathode in sodium ion batteries. (C) 2019 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder Technology Japan. All rights reserved.