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Sun, Hao; Zhu, Guanzhou; Xu, Xintong; Liao, Meng; Li, Yuan-Yao; Angell, Michael; Gu, Meng; Zhu, Yuanmin; Hung, Wei Hsuan; Li, Jiachen; Kuang, Yun; Meng, Yongtao; Lin, Meng-Chang; Peng, Huisheng; Dai, Hongjie
Nature communications, 07/2019, Letnik: 10, Številka: 1Journal Article
Rechargeable sodium metal batteries with high energy density could be important to a wide range of energy applications in modern society. The pursuit of higher energy density should ideally come with high safety, a goal difficult for electrolytes based on organic solvents. Here we report a chloroaluminate ionic liquid electrolyte comprised of aluminium chloride/1-methyl-3-ethylimidazolium chloride/sodium chloride ionic liquid spiked with two important additives, ethylaluminum dichloride and 1-ethyl-3-methylimidazolium bis(fluorosulfonyl)imide. This leads to the first chloroaluminate based ionic liquid electrolyte for rechargeable sodium metal battery. The obtained batteries reached voltages up to ~ 4 V, high Coulombic efficiency up to 99.9%, and high energy and power density of ~ 420 Wh kg and ~ 1766 W kg , respectively. The batteries retained over 90% of the original capacity after 700 cycles, suggesting an effective approach to sodium metal batteries with high energy/high power density, long cycle life and high safety.
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