期刊
ACS APPLIED MATERIALS & INTERFACES
卷 7, 期 17, 页码 9169-9177出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b01412
关键词
lithium-sulfur batteries; fluorinated electrolyte; polysulfide shuttle dissolution; solid-electrolyte interphase; lithium anode passivation
资金
- Vehicle Technologies Office, U.S. Department of Energy. Argonne, a U.S. Department of Energy laboratory [DE-AC02-06CH11357]
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.
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