A new fluorine-containing sulfone-based electrolyte for advanced performance lithium metal batteries. (1st August 2023)

• Record Type: Journal Article
• Authors: Xue, Sa; Zhou, Yang; Liu, Xiangyang; He, Maogang
• Is Part Of: Journal of energy storage. Volume 64(2023)
• Publication Date: 2023-08-01
• Subjects: Lithium metal batteries -- Fluorine-containing -- Sulfone-based electrolyte -- Synergistic effect -- LiF-rich; Energy storage -- Periodicals; Energy storage -- Research -- Periodicals; 621.3126
• DOI: 10.1016/j.est.2023.107137
• Languages: English
• ISSNs: 2352-152X

Abstract

Abstract: Lithium dendrite growth greatly limits the application of lithium metal batteries. Herein, a new fluorine-containing sulfone-based electrolyte is proposed for lithium metal batteries. Benefiting from the synergistic effect of lithium bis(fluorosulfonyl)imide (LiFSI) and fluoroethylene carbonate (FEC), a LiF-rich stable SEI with compact and uniform morphology is formed on lithium metal anode, suppressing the Li dendrite formation and enhance the cycling life. In Li||Cu half-battery, a remarkable Coulombic efficiency of 95.9 % within 130 cycles and 93.5 % within 100 cycles are realized at 0.5 mA·cm −2 and 1 mA·cm −2, respectively. In Li||Li symmetric battery, the cycling life is about 480 h at 1.0 mA·cm −2 which is double as the commercial electrolyte. Moreover, in Li||LiFePO4 battery, a significantly improved capacity retention of 94.3 % with a high average Coulombic efficiency of 99.8 % after 100 cycles is achieved at 0.5C. The designed new fluorine-containing sulfone-based electrolyte provides new strategy toward high energy density lithium metal batteries. Highlights: A LiF-rich stable SEI is formed by the synergistic effect of LiFSI and FEC. A CE of 95.9 % within 130 cycles is realized at 1 mA·cm −2 in Li||Cu half-battery. A capacity retention of 94.3 % after 100 cycles is get at 0.5C in Li||LFP battery.