Abstract
The intrinsic ring-opening polymerization of five-membered cyclic ether induced by Lewis acid hinder its practical application as electrolyte solvents in sodium-ion batteries. In this work, we find that introducing tris (2,2,2-trifluoroethyl) borate (TTFEB), an anion acceptor additive, into cyclic ether-based electrolyte solution effectively inhibits its polymerization by tethering the PF6
− anion. In addition, a stable inorganics-rich SEI layer is formed in TTFEB-containing electrolyte solution, which ensures fast Na+ transport kinetics upon extensive cycles. As a result, the cycle stability and rate capability of HC anodes in 1,3-dioxolane-based electrolyte solutions are evidently improved by TTFEB additive. Our study paves the way for the application of cyclic ethers in sodium-ion batteries.
Funder
National Natural Science Foundation of China
Fundamental Research Funds for the Central Universities
Publisher
The Electrochemical Society
Subject
Materials Chemistry,Electrochemistry,Surfaces, Coatings and Films,Condensed Matter Physics,Renewable Energy, Sustainability and the Environment,Electronic, Optical and Magnetic Materials
Cited by
11 articles.
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