The development of low-cost and long-lasting all-climate cathode materials for the sodium ion battery has been one of the key issues for the success of large-scale energy storage. One option is the utilization of earth-abundant elements such as iron. Here, we synthesize a NASICON-type tuneable Na 4Fe 3(PO 4) 2(P 2O 7)/C nanocomposite which shows both excellent rate performance and outstanding cycling stability over more than 4400 cycles. Its air stability and all-climate properties are investigated, and its potential as the sodium host in full cells has been studied. A remarkably low volume change of 4.0% is observed. Its high sodium diffusion coefficient has been measured and analysed via first-principles calculations, and its three-dimensional sodium ion diffusion pathways are identified. Our results indicate that this low-cost and environmentally friendly Na 4Fe 3(PO 4) 2(P 2O 7)/C nanocomposite could be a competitive candidate material for sodium ion batteries.
Here Chou and co-authors demonstrate a NASICON-type low-cost Fe-based cathode material for sodium ion batteries. Na 4Fe 3(PO 4) 2(P 2O 7) allows for long-term cycling and high-power density and is featured by its air stability and all-climate property with 3D diffusion pathways for Na + ions.