Chagas Luciana Gomes, Jeong Sangsik, Hasa Ivana, Passerini Stefano
Helmholtz Institute Ulm (HIU) , Helmholtzstrasse 11 , 89081 Ulm , Germany.
Karlsruhe Institute of Technology (KIT) , P.O. Box 3640, 76021 Karlsruhe , Germany.
ACS Appl Mater Interfaces. 2019 Jun 26;11(25):22278-22289. doi: 10.1021/acsami.9b03813. Epub 2019 Jun 12.
Ionic liquids (ILs) are considered as appealing alternative electrolytes for application in rechargeable batteries, including next-generation sodium-ion batteries, because of their safe and eco-friendly nature, resulting from their extremely low volatility. In this work, two groups of advanced pyrrolidinium-based IL electrolytes are concerned, made by mixing sodium bis(fluorosulfonyl)imide (NaFSI) or sodium bis(trifluoromethanesulfonyl)imide (NaTFSI) salts salts with N-methyl- N-propylpyrrolidinium bis(fluorosulfonyl)imide (PyrFSI), N-butyl- N-methylpyrrolidinium bis(fluorosulfonyl)imide (PyrFSI), and N-butyl- N-methylpyrrolidinium bis(trifluoromethanesulfonyl)imide (PyrFSI). The characterization of eight different electrolytes, including single anion electrolytes and binary anion mixtures, in terms of thermal properties, density, viscosity, and conductivity, as well as electrochemical stability window and cycling performance in room-temperature sodium cells, is reported here. Among all of the blends, those containing PyrFSI outperform the others in terms of cell performance enabling the layered P2-NaNiAlMnO cathode to deliver about 140 mAh g for more than 200 cycles.
离子液体（ILs）因其极低的挥发性而具有安全环保的特性，被认为是可用于包括下一代钠离子电池在内的可充电电池的有吸引力的替代电解质。在这项工作中，研究了两组先进的基于吡咯烷鎓的离子液体电解质，它们是通过将双（氟磺酰）亚胺钠（NaFSI）或双（三氟甲磺酰）亚胺钠（NaTFSI）盐与N-甲基-N-丙基吡咯烷鎓双（氟磺酰）亚胺（PyrFSI）、N-丁基-N-甲基吡咯烷鎓双（氟磺酰）亚胺（PyrFSI）和N-丁基-N-甲基吡咯烷鎓双（三氟甲磺酰）亚胺（PyrFSI）混合而成。本文报道了八种不同电解质的特性，包括单阴离子电解质和二元阴离子混合物在热性能、密度、粘度和电导率方面的特性，以及在室温钠电池中的电化学稳定性窗口和循环性能。在所有混合物中，含PyrFSI的混合物在电池性能方面优于其他混合物，能使层状P2-NaNiAlMnO阴极在200多个循环中提供约140 mAh g的电量。
