多硫化物
多孔性
化学工程
硫黄
材料科学
溶解
碳纤维
氧化物
电化学
化学
阴极
纳米技术
电解质
电极
复合材料
复合数
冶金
工程类
物理化学
作者
Manfang Chen,Qun Lü,Shouxin Jiang,Cheng Huang,Xianyou Wang,Bing Wu,Kaixiong Xiang,Yuting Wu
标识
DOI:10.1016/j.cej.2017.11.039
摘要
Nanostructured porous carbon materials are widely used as sulfur host materials in order to enhance sulfur utilization and improve electrical performance in Li-S batteries. However, owing to interface incompatibility between the nanocarbon with homogeneous nonpolar surface and intrinsic polar sulfur guests, the cathode materials still face poor stability during the long-term cycling process. Herein, based on a highly effective sulfur host, namely manganese oxide nanosheets grown on both sides of the N-doped hollow porous carbon nanospheres (NHCSs@MnO2), we put forward a rational physical and chemical dual-encapsulation strategy for the application of advanced Li-S batteries. The multifunctional, integrated and hollow hybrid nanospheres can provide efficient electron-modified interface, hold much more active material, and importantly face-to-face effectively prevent polysulfide dissolution and diffusion via the synergistic restriction, thus the developed NHCSs@MnO2/S composite exhibits an initial discharge capacity of 1249 mAh g−1 at 0.5 C and a sustainable cycling stability with ultralow capacity decay of only 0.041% per cycle over 1000 cycles, implying its great prospects for the improved cyclability and electrochemical performance as application of advanced Li-S battery.
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