Abstract
Current Li–S battery technology has yet to reach the promise of high capacity and suffers rapid capacity fade due in large part to the dissolution and diffusion of polysulphide intermediates. The electrolyte plays a significant role here as well as in stabilizing the Li metal anode electrochemistry. In this work, a novel hybrid electrolyte system is investigated based on varying composition of N-methyl, N-propyl pyrrolidinium bisfluorosulfonimide (C3mpyrFSI) ionic liquid (IL) and 1,2-dimethoxy ether (DME) at the saturated concentration of LiFSI salt, demonstrating a most favorable performance for an 80:20 IL/DME composition (by weight). This electrolyte presented higher ionic conductivity and diffusivity while simultaneously improving the electrochemical behavior of Li metal plating and stripping. The ionic interactions among different species of the electrolyte have been studied by NMR spin lattice relaxation time (T1) measurements, which indicated that Li–DME is likely to form chelation compounds, there...
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