Abstract:

 lithium-sulfur (Li-S) batteries with low cost, long life, high energy, and environmental benignity promise great potential to be the next-generation high-energy system. However, the practicality of Li-S technology is hindered by various obstacles, such as rapid capacity fading along with low coulombic efficiency arising from high solubility of long-chain lithium polysulfides and the shuttle effect in lithium sulfur battery. During the cycling, the generated polysulfides can be measured quickly and accurately by UV/vis analysis, which plays an important role in the analysis of Li-S batteries. This paper mainly introduced the newest applications of in-situ UV/vis analysis in Li-S batteries as well as the qualitative and quantitative analysis of the generated polysulfides during charge and discharge process.