【摘 要】
：
Lithium-sulfur batteries hold promise for next generation batteries due to their high theoretical energy density and low cost.However,the rapid capacity fading
【机 构】
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Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education),School of Materials S
论文部分内容阅读
Lithium-sulfur batteries hold promise for next generation batteries due to their high theoretical energy density and low cost.However,the rapid capacity fading caused by the shuttle of polysulfide between two electrodes severely hinders the practical application of Li-S batteries.To address the issue,we reported a three-dimensional heterostructured TiO2 nanosheets/N-doped carbon (TO/NC),which is coated on a commercial polypropylene (PP) separator,as an efficient barrier for Li-S batteries.The TO/NC coating layer provides a bipolar chemical adsorption of lithium polysulfides (LiPSs) via TiO2 nanosheets with exposed(001) facets and N-doped carbon,showing high trapping capacity and remarkable electrocatalytic activity for LiPSs.The slurry-bladed carbon black/sulfur cathode with 64wt％ sulfur offers outstanding perfor-mance with an initial capacity of 1314mAh g-1 at 0.2 C.Over 900 cycles,the cell still maintains the capacity of 448 mAh g-1 at a 1 C rate with a degradation rate of only 0.055％ per cycle.The separator reported in this work holds great promise for the development of high-energy Li-S batteries.
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