Abstract
Development of secondary batteries based on abundant and inexpensive elements are vital. Among various alternative choices, sodium-ion batteries (NIBs) are promising because of plentiful resources and low costs of sodium metal. Different types of cathode materials for NIBs have been designed and studied to meet the challenging requirements. Among them pyrophosphate cathodes have shown promising electrochemical performance and thermal stability in sodium ion batteries (SIBs). In the present study, we report synthesis and thermal behavior of a novel Na2Fe0.33Mn0.33Co0.33P2O7 cathode material developed for sodium rechargeable batteries. The material was developed through solid state process. The structural analysis of Na2Fe0.33Mn0.33Co0.33P2O7 revealed that the substitution of multicomponent transition metals have achieved triclinic crystal structure (P1 space group). TGA/DTA and thermal in-situ XRD analyses (25 similar to 550 degrees C) confirm decent thermal stability of this material up to 550 degrees C even in the desodiated state with negligible weight loss (5%). Owing to its promising thermal stability, Na2Fe0.33Mn0.33Co0.33P2O7, would be an attractive cathode for sodium ion batteries.