本 发明 公开了一种基于锂硫 电池 的砜基 电解 液及其制备方法和应用，涉及锂硫电池技术领域。本发明的砜基电解液由双三氟甲磺酰亚胺锂、环丁砜和氟代醚组成，所述氟代醚与环丁砜之间的体积比为2:1‑5:1，所述双三氟甲磺酰亚胺锂与环丁砜之间的摩尔比为1:2；本发明还包括一种基于锂硫电池的砜基电解液的制备方法及应用。本发明基于LiTFSI和TMS摩尔比为1:2的基准电解液，系统研究了不同TTE稀释比例对电解液特性及电池电化学性能的影响，通过调节TTE稀释比例以及调控电池的充放电制度来提高Li‑S电池的循环 稳定性 ，实现TMS局部高浓度电解液在大倍率条件下高的容量保持率。

The present invention discloses a sulfone electrolyte based on a lithium-sulfur battery and a preparation method and application thereof, and relates to the technical field of lithium-sulfur batteries. The sulfone electrolyte of the present invention comprises lithium bis(trifluoromethanesulfonyl)imide, cyclobutyl sulfone, and a fluorinated ether, the volume ratio between said fluorinated ether and cyclobutyl sulfone being 2: 1-5: 1, and the molar ratio between said lithium bis(trifluoromethanesulfonyl)imide and cyclobutyl sulfone being 1: 2; the present invention also comprises a method of preparing and an application of a sulfone electrolyte based on a lithium-sulfur battery. The present invention is based on a benchmark electrolyte with a molar ratio of 1: 2 between LiTFSI and TMS, and systematically investigates the effects of different TTE dilution ratios on the electrolyte characteristics and electrochemical performance of the battery, and improves the cycling stability of Li-S batteries by adjusting the TTE dilution ratio as well as regulating the charging and discharging regimes of the batteries, and realizes the high capacity retention rate of TMS localized high-concentration electrolyte under the condition of high multiplication rate. The high capacity retention rate of TMS localized high concentration electrolyte under large multiplication rate is realized.