“…[25,26] As an essential component for a Li-S battery, the insulating separator allows Li + to migrate through and prevents internal short-circuiting. [27] Up to now, various materials have been applied to modify the separator so as to mitigate the shuttle effect and enhance the reaction kinetics of LiPSs such as carbon materials, [28] oxides, [29] sulfides, [30,31] COFs (covalent organic frameworks), [21] and MOFs (metal-organic frameworks). [26,32] Recently, rare-earth-based materials, including CeO 2 , [33,34] Sc 2 O 3 , [35] CeF 3 , [36] La(OH) 3 , [37] Eu 2 O 3 , [38] and Sm 2 O 3 , [39] have also been reported to catalyze and accelerate LiPSs conversion for Li-S batteries.…”