Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Collaborative Innovation Center of Chemical Science and Engineering, College of Chemistry , Nankai University , Tianjin 300071 , China.
Institute for Superconducting and Electronic Materials , University of Wollongong , Wollongong , New South Wales 2522 , Australia.
ACS Appl Mater Interfaces. 2018 Oct 24;10(42):35978-35983. doi: 10.1021/acsami.8b11824. Epub 2018 Oct 11.
Dual ion batteries based on Na and PF received considerable attention due to their high operating voltage and the abundant Na resources. Here, cheap and easily obtained graphite that served as a cathode material for dual ion battery delivered a very high average discharge platform (4.52 V vs Na/Na) by using sodium hexafluorophosphate in propylene carbonate as electrolyte. Moreover, the all-carbon dual ion batteries with graphite as cathode and hard carbon as anode exhibited an ultrahigh discharge voltage of 4.3 V, and a reversible capacity of 62 mAh·g at 40 mA·g. Phase changes have been investigated in detail through in situ X-ray diffraction and in situ Raman characterizations. The stable structure provides long life cycling performance, and the pseudocapacitance behavior also demonstrates its benefits to the rate capability. Thus, dual ion batteries based on sodium chemistry are very promising to find their applications in future.
基于 Na 和 PF 的双离子电池由于其高工作电压和丰富的 Na 资源而受到广泛关注。在这里，廉价且易于获得的石墨用作双离子电池的阴极材料，在碳酸丙烯酯中的六氟磷酸钠作为电解质时，其平均放电平台（相对于 Na/Na 为 4.52 V）非常高。此外，以石墨为阴极、硬碳为阳极的全碳双离子电池的放电电压高达 4.3 V，在 40 mA·g 时的可逆容量为 62 mAh·g。通过原位 X 射线衍射和原位拉曼光谱对相变化进行了详细研究。稳定的结构提供了长循环寿命性能，赝电容行为也证明了其对倍率性能的益处。因此，基于钠化学的双离子电池很有希望在未来得到应用。
