"Anchor-Turbo" Strategy for Constructing Ni-VO2 Coating Layer to Achieve Wide Temperature and High-Performance Lithium-Sulfur Batteries

Commercially, lithium metal batteries are still limited by the growth of lithium dendrites and excessive consumption of electrolyte. The lithium-sulfur battery has the advantages of high energy density and low material cost. It is considered to be one of the most promising energy storage technology batteries. Although it has developed rapidly in recent decades, there is still a crucial problem: the shuttle of lithium polysulfide (LiPSs). To solve this critical problem, the Ni-VO2 nanoflower structure is designed to strongly adsorb LiPSs, lower the Li2S decomposition barrier, accelerate the effective discharge in the reaction process, and improve the Coulomb efficiency. Particularly, the Ni-VO2 coating layer demonstrated a high initial discharge capacity of 853 mAh g(-1) at 1 C and retained a stable cycling performance with a reversible capacity of 632 mAh g(-1) over 1000 cycles (capacity decay of 0.002% per cycle). Even under extreme conditions of 0 and 60 degrees C, the capacities of 700 and 920 mAh g(-1) are maintained, respectively. Such excellent wide temperature performance and cycle stability reveal its good potential for use in advanced Li-S batteries.