NASICON-type air-stable and all-climate cathode for sodium-ion batteries with low cost and high-power density
Authors: Chen, MZ; Hua, WB; Xiao, J; Cortiel, D; Chen, WH; Wang, EH; Hul, Z; Gu, QF; Wangl, XL; Indris, S; Chou, SL; Dou, SX
Volume: 10 Published: APR 1 2019 Language: English Document type: Article
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 Na4Fe3(PO4)(2)(P2O7)/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 Na4Fe3(PO4)(2)(P2O7)/C nanocomposite could be a competitive candidate material for sodium ion batteries.