首页|Lithium cation-doped tungsten oxide as a bidirectional nanocatalyst for lithium-sulfur batteries with high areal capacity
Lithium cation-doped tungsten oxide as a bidirectional nanocatalyst for lithium-sulfur batteries with high areal capacity
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Lithium-sulfur(Li-S)batteries are promising for high energy-storage applications but suffer from sluggish conversion reaction kinetics and substantial lithium sulfide(Li2S)oxidation barrier,especially under high sulfur loadings.Here,we report a Li cation-doped tungsten oxide(LixWOx)electrocatalyst that efficiently accelerates the S↔Li2S interconversion kinetics.The incorporation of Li dopants into WOx cationic vacan-cies enables bidirectional electrocatalytic activity for both polysulfide reduction and Li2S oxidation,along with enhanced Li+diffusion.In conjunction with theoretical calculations,it is discovered that the improved electrocatalytic activity originates from the Li dopant-induced geometric and electronic struc-tural optimization of the LixWOx,which promotes the anchoring of sulfur species at favourable adsorp-tion sites while facilitating the charge transfer kinetics.Consequently,Li-S cells with the LixWOx bidirectional electrocatalyst show stable cycling performance and high sulfur utilization under high sul-fur loadings.Our approach provides insights into cation engineering as an effective electrocatalyst design strategy for advancing high-performance Li-S batteries.
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