Improved Li-Ion Transport by DME Chelation in a Novel Ionic Liquid-Based Hybrid Electrolyte for Li–S Battery Application

• DOI: 10.1021/acs.jpcc.8b03909
• Publication Date: 2018-06-06T17:07:50Z
• Authors: Urbi Pal; Gaetan M. A. Girard; Luke A. O’Dell; Binayak Roy; Xiaoen Wang; Michel Armand; Douglas R. MacFar...; Patrick C. Howlett; Maria Forsyth
• Keywords: ELECTROCHEMICAL-BEHAVIOR; CHEMISTRY; ANION; LITHIUM-SULFUR BATTERIES; AMMONIUM; 02 engineering and technology; 0210 nano-technology; 7. Clean energy; 1,3-DIOXOLANE-LICLO4 SOLUTIONS; 3. Good health

Current Li–S battery technology has yet to reach the promise of high capacity and suffers rapid fade due in large part dissolution diffusion polysulphide intermediates. The electrolyte plays a significant role here as well stabilizing Li metal anode electrochemistry. In this work, novel hybrid system is investigated based on varying composition N-methyl, N-propyl pyrrolidinium bisfluorosulfonimide (C3mpyrFSI) ionic liquid (IL) 1,2-dimethoxy ether (DME) at saturated concentration LiFSI salt, demonstrating most favorable performance for an 80:20 IL/DME (by weight). This presented higher conductivity diffusivity while simultaneously improving electrochemical behavior plating stripping. interactions among different species have been studied by NMR spin lattice relaxation time (T1) measurements, which indicated that Li–DME likely form chelation compounds, thereby breaking down larger aggregates resulting smaller solvation shell mobility. An ex situ study also efficient eliminating dissolution. Therefore, its ability suppress enhance transport properties, minimizing volatile organic solvent component, excellent candidate further explore future systems.