Understanding the effect of a fluorinated ether on the performance of lithium-sulfur batteries

Nasim Azimi, Zheng Xue, Ira Bloom, Mikhail L. Gordin, Donghai Wang, Tad Daniel, Christos Takoudis, Zhengcheng Zhang

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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.

Original languageEnglish (US)
Pages (from-to)9169-9177
Number of pages9
JournalACS Applied Materials and Interfaces
Volume7
Issue number17
DOIs
StatePublished - May 6 2015

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All Science Journal Classification (ASJC) codes

  • Materials Science(all)

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