title: Understanding the effect of a fluorinated ether on the performance of lithium-sulfur batteries.
abstract: A high performance Li-S battery with novel fluoroether-based electrolyte was reported. The fluorinated electrolyte prevents the polysulfide shuttling effect and improves the Coulombic efficiency and capacity retention of the Li-S battery. Reversible redox reaction of the sulfur electrode in the presence of fluoroether TTE was systematically investigated. Electrochemical tests and post-test analysis using HPLC, XPS, and SEM/EDS were performed to examine the electrode and the electrolyte after cycling. The results demonstrate that TTE as a cosolvent mitigates polysulfide dissolution and promotes conversion kinetics from polysulfides to Li2S/Li2S2. Furthermore, TTE participates in a redox reaction on both electrodes, forming a solid electrolyte interphase (SEI) which further prevents parasitic reactions and thus improves the utilization of the active material.
authors: †Chemical Sciences and Engineering Division, Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, Illinois 60439, United States.
authors: Nasim
authors: N
authors: Azimi
authors: †Chemical Sciences and Engineering Division, Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, Illinois 60439, United States.
authors: Zheng
authors: Z
authors: Xue
authors: †Chemical Sciences and Engineering Division, Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, Illinois 60439, United States.
authors: Ira
authors: I
authors: Bloom
authors: ‡Department of Mechanical and Nuclear Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United States.
authors: Mikhail L
authors: ML
authors: Gordin
authors: ‡Department of Mechanical and Nuclear Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United States.
authors: Donghai
authors: D
authors: Wang
authors: §Research Resources Center, Department of Chemical Engineering and Bioengineering, University of Illinois at Chicago, Chicago, Illinois 60607, United States.
authors: Tad
authors: T
authors: Daniel
authors: §Research Resources Center, Department of Chemical Engineering and Bioengineering, University of Illinois at Chicago, Chicago, Illinois 60607, United States.
authors: Christos
authors: C
authors: Takoudis
authors: †Chemical Sciences and Engineering Division, Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, Illinois 60439, United States.
authors: Zhengcheng
authors: Z
authors: Zhang
keywords: fluorinated electrolyte; lithium anode passivation; lithium−sulfur batteries; polysulfide shuttle dissolution; solid−electrolyte interphase