标题：Nitrogen-Doped Graphene-Supported Mixed Transition-Metal Oxide Porous Particles to Confine Polysulfides for Lithium–Sulfur Batteries
作者：Sun, Qian ;Xi, Baojuan ;Li, Jiang-Ying ;Mao, Hongzhi ;Ma, Xiaojian ;Liang, Jianwen ;Feng, Jinkui ;Xiong, Shenglin
作者机构：[Sun, Qian ;Xi, Baojuan ;Mao, Hongzhi ;Ma, Xiaojian ;Xiong, Shenglin ] Key Laboratory of the Colloid and Interface Chemistry, Ministry of Education, a 更多
来源：Advanced Energy Materials
摘要：The intricate charge–discharge reactions and bad conductivity nature of sulfur determine the extreme importance of cathode engineering for Li–S batteries. Herein, spinel ZnCo2O4 porous particles@N-doped reduced graphene oxide (ZnCo2O4@N-RGO) are prepared via the combined procedures of refluxing and hydrothermal treatment, consisting of interconnected uniform ZnCo2O4 nanocubes with an average size of 5 nm anchored on graphene nanosheets. The as-obtained composite can act as an inimitable cathode scaffold to suppress the shuttling of polysulfides by chemical confinement of ZnCo2O4 and N-RGO for the first time, as demonstrated by the adsorption energy of ZnCo2O4 to Li2S4 via the strong chemical bonding between Zn or Co and S. The RGO nanosheets with a relatively high specific surface area provide a good conductive network and structural stability. The introduction of doped N atoms and numerous ZnCo2O4 porous nanoparticles can inhibit the transfer of lithium polysulfides between the cathode and anode. Due to the unique structural and compositional features, the as-obtained hybrid materials with the high sulfur loading of 71% and even 82% still deliver high specific capacity, good rate capability, and enhanced cycling stability with exceptionally high initial Coulombic efficiency, which displays a high utilization of sulfur.
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