FSI-inspired solvent and “full fluorosulfonyl” electrolyte for 4 V class lithium-metal batteries
Author(s)Xue, Weijiang; Shi, Zhe; Huang, Mingjun; Feng, Shuting; Wang, Chao; Wang, Fei; Lopez, Jeffrey; Qiao, Bo; Xu, Guiyin; Zhang, Wenxu; Dong, Yanhao; Gao, Rui; Shao-Horn, Yang; Johnson, Jeremiah A.; Li, Ju; ... Show more Show less
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High-voltage rechargeable lithium-metal batteries (LMBs) require electrolytes that are compatible with both the Li metal anode (LMA) and the metal-oxide cathode. Herein, by imitating the fluorosulfonyl imide group from a well-known LMA-compatible salt, lithium bis(fluorosulfonyl) imide (LiFSI), we come up with an organic solvent dimethylsulfamoyl fluoride (FSO[subscript 2]NC[subscript 2]H[subscript 6]), a fluorosulfonamide (FSA) with two methyl substituents, to develop a new "full fluorosulfonyl" (FFS) electrolyte. Remarkably, it enables a highly reversible LMA with an excellent initial coulombic efficiency (CE) ∼91%, and rapidly approaching 99% within only 10 cycles, with average CE outperforming the well-known LMA-compatible fluoroethylene carbonate (FEC)-based electrolyte. Furthermore, benefitting from its high anodic stability against the oxidative LiNi[subscript 0.6]Mn[subscript 0.2]Co[subscript 0.2]O[subscript 2] (NMC622) and LiMn[subscript 2]O[subscript 4] (LMO) surfaces, the LiNMC622 cell retains 89% of its original capacity after 200 cycles using a limited Li excess anode. This electrolyte design strategy opens a new avenue for exploring new medium-concentration organic electrolytes for 4 V class lithium-metal batteries (LMBs).
DepartmentMassachusetts Institute of Technology. Department of Nuclear Science and Engineering; Massachusetts Institute of Technology. Department of Materials Science and Engineering; Massachusetts Institute of Technology. Department of Chemistry; Massachusetts Institute of Technology. Department of Chemical Engineering; Massachusetts Institute of Technology. Research Laboratory of Electronics; Massachusetts Institute of Technology. Department of Mechanical Engineering
Energy & Environmental Science
Royal Society of Chemistry (RSC)
Xue, Weijiang et al. "FSI-inspired solvent and “full fluorosulfonyl” electrolyte for 4 V class lithium-metal batteries." Energy & Environmental Science 13, 1 (January 2020): 212-220 © 2020 The Royal Society of Chemistry.
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