Ether-based electrolyte enabled Na/FeS2 rechargeable batteries |
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| Institution: | 1. Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20742, USA;2. National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;1. School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, PR China;2. Ningbo Institute of Material Technology and Engineering (NIMTE), Chinese Academy of Sciences, Ningbo, 315201, PR China;3. University of Chinese Academy of Sciences, Beijing, 100049, PR China;1. Tianjin Key Laboratory of Advanced Functional Porous Materials, Institute for New Energy Materials and Low-Carbon Technologies, School of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, PR China;2. School of Materials Science and Engineering, Tianjin University, Tianjin 300350, PR China |
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| Abstract: | We demonstrate for the first time that by simply substituting ether-based electrolyte (1.0 M NaCF3SO3 in diglyme) for the commonly used carbonate-based electrolyte, the cyclability of FeS2 towards sodium storage can be significantly improved. A sodiation capacity over 600 mAh/g and a discharge energy density higher than 750 Wh/kg are obtained for FeS2 at 20 mA/g. When tested at 60 mA/g, FeS2 presents a sodiation capacity of 530 mAh/g and retains 450 mAh/g after 100 cycles, much better than the cycling performance of Na/FeS2 tested in carbonate-based electrolyte. |
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