A bipolar modified separator using TiO2 nanosheets anchored on N-doped carbon scaffold for high-performance Li–S batteries
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2020年第20期
论文作者：Na Li Fei Chen Xiangtao Chen Zhongxu Chen Yang Qi Xiaodong Li Xudong Sun
文章页码：152 - 158
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 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 polypro pylene（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 64 wt% sulfur offers outstanding performance with an initial capacity of 1314 mAh g-1 at 0.2 C.Over 900 cycles,the cell still maintains the capacity of 448 mA h 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.
Na Li1，Fei Chen1,2，Xiangtao Chen1，Zhongxu Chen1，Yang Qi1，Xiaodong Li1，Xudong Sun1,2
1. Key Laboratory for Anisotropy and Texture of Materials Ministry of Education, School of Materials Science and Engineering, Northeastern University2. College of Environmental and Chemical Engineering, Dalian University
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 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 polypro pylene（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 64 wt% sulfur offers outstanding performance with an initial capacity of 1314 mAh g-1 at 0.2 C.Over 900 cycles,the cell still maintains the capacity of 448 mA h 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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