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A highly efficient double-hierarchical sulfur host for advanced lithium–sulfur batteries†
Chemical Science ( IF 7.6 ) Pub Date : 2017-11-06 00:00:00 , DOI: 10.1039/c7sc03960c Linyu Hu 1 , Chunlong Dai 1 , Jin-Myoung Lim 2 , Yuming Chen 3 , Xin Lian 2, 4 , Minqiang Wang 1 , Yi Li 1 , Penghao Xiao 2 , Graeme Henkelman 2 , Maowen Xu 1
Chemical Science ( IF 7.6 ) Pub Date : 2017-11-06 00:00:00 , DOI: 10.1039/c7sc03960c Linyu Hu 1 , Chunlong Dai 1 , Jin-Myoung Lim 2 , Yuming Chen 3 , Xin Lian 2, 4 , Minqiang Wang 1 , Yi Li 1 , Penghao Xiao 2 , Graeme Henkelman 2 , Maowen Xu 1
Affiliation
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Li–S batteries have attracted enormous interest due to their potentially high energy density, non-toxicity and the low cost of sulfur. The main challenges of sulfur cathodes are the short cycling life and limited power density caused by the low conductivity of sulfur and dissolution of Li polysulfides. Here we design a new double-hierarchical sulfur host to address these problems. Hierarchical carbon spheres (HCSs), constructed from building blocks of hollow carbon nanobubbles for loading sulfur, are sealed within a thin, polar MoS2 coating composed of ultrathin nanosheets. Experimental and theoretical studies show a strong absorption of the MoS2 nanoshell to polysulfides, and the excellent stability of the MoS2 nanosheets after the adsorption of polysulfides. Moreover, MoS2 promotes the electrochemical redox kinetics in Li–S batteries. Benefiting from the unique hierarchical, hollow and compositional characteristics of the host, the S/MoS2@HCS composite electrode shows a high capacity of 1048 mA h g−1 at 0.2C, good rate capacity and long cycling life with a slow capacity decay of 0.06% per cycle.
中文翻译：
用于先进锂硫电池的高效双层次硫主体†
锂硫电池由于其潜在的高能量密度、无毒和硫的低成本而引起了极大的兴趣。硫正极的主要挑战是硫的低电导率和多硫化物的溶解导致的循环寿命短和功率密度有限。在这里，我们设计了一种新的双层次硫主体来解决这些问题。分层碳球 (HCS) 由用于装载硫的空心碳纳米气泡构建块构成，被密封在由超薄纳米片组成的薄极性 MoS 2涂层内。实验和理论研究表明MoS 2纳米壳对多硫化物有很强的吸附作用，并且吸附多硫化物后MoS 2纳米片具有优异的稳定性。此外，MoS 2促进Li-S电池中的电化学氧化还原动力学。受益于主体独特的分层、空心和成分特征，S/MoS 2 @HCS复合电极在0.2C下表现出1048 mA hg -1的高容量、良好的倍率容量和长循环寿命，且容量衰减缓慢每个周期 0.06%。
更新日期：2017-11-06
中文翻译：
用于先进锂硫电池的高效双层次硫主体†
锂硫电池由于其潜在的高能量密度、无毒和硫的低成本而引起了极大的兴趣。硫正极的主要挑战是硫的低电导率和多硫化物的溶解导致的循环寿命短和功率密度有限。在这里，我们设计了一种新的双层次硫主体来解决这些问题。分层碳球 (HCS) 由用于装载硫的空心碳纳米气泡构建块构成，被密封在由超薄纳米片组成的薄极性 MoS 2涂层内。实验和理论研究表明MoS 2纳米壳对多硫化物有很强的吸附作用，并且吸附多硫化物后MoS 2纳米片具有优异的稳定性。此外，MoS 2促进Li-S电池中的电化学氧化还原动力学。受益于主体独特的分层、空心和成分特征，S/MoS 2 @HCS复合电极在0.2C下表现出1048 mA hg -1的高容量、良好的倍率容量和长循环寿命，且容量衰减缓慢每个周期 0.06%。
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