过 渡 金 属 催 化 剂 在 锂 硫 电 池 中 的 应 用 及 催 化 机 理研究

Li-S batteries have great application prospects because of their extremely high capacity and energy density. However， the instability and insulation of polysulfides （LiPSs） seriously hinder their further application. In order to solve the problem of slow reaction kinetics in Li-S batteries，it is urgent to explore efficient catalysts to accelerate the sulfur redox. In the case，transition metals with unique and excellent catalytic properties are considered as potential catalysts for Li-S battery. However，differences in the structure and properties of transition metals will lead to different catalytic mechanisms. Therefore，this work divides five types of transition metals（ferrous metals，conventional non-ferrous metals，precious metals，rare refractory metals，and rare earth metals）based on metal characteristics. Then，the catalytic mechanisms of transition metal catalysts were analyzed，including adsorption，accelerating electron transfer，reducing activation energy and co-catalysis. Besides，the research progress of various metals used in Li-S batteries was reviewed，and the catalytic mechanisms of different types of metals were clarified. Four optimization strategies were proposed：nanostructured design，doping-modification，alloying and external cladding，in order to provide certain references for the design of Li-S battery catalysts.