Xiaomin Cai, B. Cui, Bei Ye
Sep 25, 2019
Citations
0
Influential Citations
22
Citations
Journal
ACS applied materials & interfaces
Abstract
The shuttle of the intermediate lithium polysulfides (LiPSs) is the main obstacle to the practical application of lithium-sulfur batteries. Herein, a poly(butyl acrylate/1-ethyl-3-vinylimidazole bis[(trifluoromethyl)sulfonyl]imide) based quasi-solid-state copolymer electrolyte (PEGDA-P(BA-co-[EVIm]TFSI) QPE-IL) was prepared for lithium-sulfur batteries. The butyl acrylate component with abundant ester groups endows the strong chemical capture for LiPSs. What's more, the introduction of ionic liquid ([EVIm]TFSI) can greatly improve the ionic conductivity and lithium-ion migration rate. More importantly, the dynamic-reversible adsorption of LiPSs was realized by chemical adsorption of ester-rich groups and electrostatic repulsion of free-moving negatively charged ions. As a result, the lithium-sulfur battery assembled by a reduced graphene oxide/carbon nanotube film@sulfur (rGOCTF@S) self-supporting cathode and QPE-IL displayed a high initial discharge capacity of 1179 mAh g-1, good cycle stability (72% capacity retention after 200 cycles at 0.5 C) and superior rate performance.