The cycling performances of lithium-sulfur batteries in TEGDME/DOL containing LiNO3 additive

Abstract

The cycling performance of lithium-sulfur batteries in binary electrolytes based on tetra(ethylene glycol)dimethyl ether (TEGDME) and 1,3-dioxolane(DOL) with lithium nitrate (LiNO3) additive were investigated. The highest ionic conductivity was obtained for 1 M LiN(CF3SO2)2 (LiTFSI) in TEGDME/DOL = 33:67(volume ratio)-based electrolyte. The cyclic efficiency of lithium-sulfur batteries was dramatically increased with LiNO3 additive as a shuttle inhibitor in electrolytes. The lithium-sulfur cell assembled with 1 M LiTFSI in TEGDME/DOL containing 0.2 M LiNO3 additive for electrolyte, the elemental sulfur for cathode, and the lithium metal for anode demonstrated the initial discharge capacity of about 900 mAh g−1 and an enhanced cycling performance.