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 language | English (US) |
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Pages (from-to) | 9169-9177 |
Number of pages | 9 |
Journal | ACS Applied Materials and Interfaces |
Volume | 7 |
Issue number | 17 |
DOIs | |
State | Published - May 6 2015 |
All Science Journal Classification (ASJC) codes
- Materials Science(all)