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NASICON-type air-stable and all-climate cathode for sodium-ion batteries with low cost and high-power density

机译:低成本高功率密度的NASICON型空气稳定型全气候阴极用于钠离子电池

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摘要

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.
机译:用于钠离子电池的低成本且持久的全气候阴极材料的开发一直是大规模储能成功的关键问题之一。一种选择是利用富含铁的元素,例如铁。在这里,我们合成了NASICON型可调谐Na4Fe3(PO4)2(P2O7)/ C纳米复合材料,它在超过4400个循环中均显示出出色的速率性能和出色的循环稳定性。研究了其空气稳定性和全气候特性,并研究了其在全细胞中作为钠宿主的潜力。观察到4.0%的极低体积变化。已通过第一性原理测量并分析了其高钠扩散系数,并确定了其三维钠离子扩散途径。我们的结果表明,这种低成本,环保的Na4Fe3(PO4)2(P2O7)/ C纳米复合材料可能是钠离子电池的竞争性候选材料。

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