“…However, before the Li metal anode can become a viable choice in Li-S batteries, some challenges need to be overcome. [258][259][260] With regard to the infinite shape change, material design, and structure optimization for 3D hosts to accommodate the metallic Li and mitigate the thickness fluctuation during cycling have been taken as promising approaches to the practical use of Li metal anodes, although further improvements are still desired. Until now, various 3D host materials, such as carbons (graphene aerogels, carbon nanofibers, CNT sponges, carbon felts, carbon clothes, and carbonized wood), [261][262][263][264][265][266] polymers (polyimide nanofibers, PAN nanofibers, and polyethylenimine sponge), [267][268][269] and conductive metals and metal compounds (Ni foams, Cu foams, and MXene aerogels), [270][271][272] have been reported to regulate the stripping/plating behavior of Li metal anodes.…”