Defect-Rich W/Mo-Doped V₂O₅ Microspheres as a Catalytic Host To Boost Sulfur Redox Kinetics for Lithium–Sulfur Batteries

It is very important to develop ideal electrocatalysts to accelerate the sulfur redox kinetics in both the discharging and charging processes for high-performance lithium–sulfur batteries. Herein, defect-rich cation-doped V2O5 yolk–shell microspheres are reported as a catalytic host of sulfur. The doping of W or Mo cations induces no impurities, broadens the lattice spacing of V2O5, and enriches the oxygen vacancy defects. Thus, the doped V2O5 host affords sufficient active sites for chemically anchoring polysulfides and promising catalytic effect on the mutual conversion between different sulfur intermediates. As a result, the S/W–V2O5 cathode delivers a discharging capacity of 1143.3 mA g–1 at an initial rate of 0.3 C and 681.8 mA g–1 at 5 C. Even under a sulfur loading of up to 5.5 mg cm–2 and a minimal electrolyte/sulfur ratio of 6 μL mg–1, the S/W–V2O5 cathode could still achieve good sulfur utilization and dependable cycle stability. Thus, this work offers an electrocatalytic host based on the cation doping strategy to greatly enhance the sulfur redox kinetics for high-performance Li–S batteries

Dual-Function Perovskite Catalytic Layer for High-Performance Lithium Sulfur Batteries

In order to solve the shuttle effect problem of energy storage devices, especially lithium–sulfur batteries, and achieve the goal of producing safe, reliable, and excellent lithium–sulfur batteries, this study uses lanthanide perovskite materials (LaCoO3) to modify the surface of sulfur electrodes and form an isolated catalytic layer. Through the coordination of chemisorption and catalytic conversion, lithium–sulfur batteries with a dual-function catalytic layer show excellent electrochemical capabilities, including high reversible capacity, excellent rate capacity, good cycle stability, and a long cycle life