All Carbon Dual Ion Batteries
All Carbon Dual Ion Batteries
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DOI：
10.1021/acsami.8b11824
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发表时间：
2018-10-24
影响因子：
9.5
通讯作者：
Dou, Shi-Xue
中科院分区：
文献类型：
--
作者：
Hu, Zhe;Liu, Qiannan;Dou, Shi-Xue
基于Na+和PF 6-的双离子电池由于具有较高的工作电压和丰富的Na资源而受到广泛关注。这里，用作双离子电池的阴极材料的廉价且容易获得的石墨通过使用碳酸丙烯酯中的六氟磷酸钠作为电解质来提供非常高的平均放电平台（4.52V vs Na+/Na）。以石墨为阴极、硬碳为阳极的全碳双离子电池，在40 mA·g（-1）下的放电电压为4.3 V，可逆容量为62 mAh·g（-1）。通过原位X射线衍射和原位拉曼表征详细研究了相变。稳定的结构提供了长寿命的循环性能，并且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具有广阔的应用前景。
Dual ion batteries based on Na+ and PF6- 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. More-over, 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-1 at 40 mA.g(-1). 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.