WSe2 Flakelets on N‐Doped Graphene for Accelerating Polysulfide Redox and Regulating Li Plating

Abstract The practical application of lithium–sulfur batteries is still limited by the lithium polysulfides (LiPSs) shuttling effect on the S cathode and uncontrollable Li‐dendrite growth on the Li anode. Herein, elaborately designed WSe 2 flakelets immobilized on N‐doped graphene (WSe 2 /NG) with abundant active sites are employed to be a dual‐functional host for satisfying both the S cathode and Li anode synchronously. On the S cathode, the WSe 2 /NG with a strong interaction towards LiPSs can act as a redox accelerator to promote the bidirectional conversion of LiPSs. On the Li anode, the WSe 2 /NG with excellent lithiophilic features can regulate the uniform Li plating/stripping to mitigate the growth of Li dendrite. Taking advantage of these merits, the assembled Li−S full batteries exhibit remarkable rate performance and stable cycling stability even at a higher sulfur loading of 10.5 mg cm −2 with a negative to positive electrode capacity (N/P) ratio of 1.4 : 1.