• lithium-sulfur batteries;
  • cathode materials;
  • electrochemistry;
  • polysulfide shuttle;
  • passivation layer
Thumbnail image of graphical abstract

Phosphorous pentasulfide (P2S5) is discovered to be a novel electrolyte additive for high-energy lithiumsulfur (Li-S) batteries. P2S5 passivates the surface of metallic lithium anodes, promotes the dissolution of Li2S, blocks the polysulfide shuttle, and thus enables long battery cycle-life. On page 1064, Chengdu Liang and co-workers demonstrate that with a theoretical energy density of 2600 Wh/kg, which is about 3–5 times higher than that of the lithium-ion batteries, Li-S batteries are promising for the next generation of high-energy batteries for large scale energy storage.