Achieving dendrite-free lithium deposition on the anode of Lithium–Sulfur battery by LiF-rich regulation layer

Lithium–Sulfur (Li‒S) battery is regarded as the most promising next-generation energy storage system due to their low cost and high theoretical energy density. However, the formation of dendritic morphology of Li makes the side reactions between Li metal anode and lithium polysulfides (LiPSs) more serious, leading to the depletion active materials and short lifespan of batteries , which becomes a bottle neck of their practical application. Herein, a LiF-rich Li deposition regulating layer (LDRL) is developed to protect the Li anode in Li‒S battery. The LiF-rich LDRL can effectively regulate the deposition morphology of Li, thus decreases the corrosion of the LiPSs to the Li anode. A symmetrical cell with LDRL can stably cycle for more than 700 h at a current density of 1 mA cm −2 . The Li‒S batteries using Li anodes with a LDRL presents better cycling stability (760 mAh g −1 after 100 cycles at 0.1 C) compared with the batteries using the bare Li anodes. This work provides a new idea for protecting Li anode in Li‒S battery.