The lithium-sulfur flow battery (LSFB) is a new addition to the rechargeable lithium flow batteries (LFBs) where sulfur or a sulfur compound is used as the cathode material against the lithium anode. We report here our evaluation of an organic sulfide - dimethyl trisulfide (DMTS), as 1) a catholyte of a LFB and 2) a multi-electron redox mediator for discharging and charging a solid sulfur cathode without any conductive additives. The latter configuration is also known as the redox-targeting lithium-sulfur flow battery (RTLSFB). The LFB provides an initial discharge capacity of 131.5 mAh g⁻¹_DMTS (1.66 A h L⁻¹), which decreases to 59 mAh g⁻¹_DMTS (0.75 A h L⁻¹) after 40 cycles. The RTLSFB delivers a significantly higher application performance - initial discharge capacity of 1225.3 mAh g⁻¹_sulfur (3.83 A h L⁻¹), for which 1030.9 mAh g⁻¹_sulfur (3.23 A h L⁻¹) is still available after 40 cycles. The significant increase in the discharge and charge duration of the LFB after sulfur addition indicates that DMTS is better used as a redox mediator in a RTLSFB than as a catholyte in a LFB.

锂硫液流电池（LSFB）是可充电锂液流电池（LFB）的新成员，其中使用硫或硫化合物作为锂负极的正极材料。我们在这里报告我们对有机硫化物-二甲基三硫化物（DMTS）的评估，作为1）LFB的阴极电解液和2）用于释放和充电固体硫阴极而没有任何导电添加剂的多电子氧化还原介体。后一种配置也称为靶向氧化还原的锂硫液流电池（RTLSFB）。LFB的初始放电容量为131.5 mAh g ^-1 _DMTS（1.66 A h L ^-1），下降到59 mAh g ^-1 _DMTS（0.75 A h L ^-1）40个周期后。RTLSFB提供了显着更高的应用性能-初始放电容量为1225.3 mAh g ^-1_硫（3.83 A h L ^-1），在40个循环后仍可提供1030.9 mAh g ^-1_硫（3.23 A h L ^-1） 。添加硫后，LFB的放电和充电持续时间显着增加，这表明DMTS在RTLSFB中用作氧化还原介体的效果优于在LFB中用作阴极电解液。