Activated graphene with tailored pore structure parameters for long cycle-life lithium–sulfur batteries

Mingbo Zheng¹, Songtao Zhang¹, Shuangqiang Chen², Zixia Lin¹, Huan Pang¹*, and Yan Yu²*

¹School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, P. R. China.

²CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, P. R. China.

Abstract:Activated graphene (AG) with various specific surface areas, pore volumes, and average pore sizes is fabricated and applied as a matrix for sulfur. The impacts of the AG pore structure parameters and sulfur loadings on the electrochemical performance of lithium-sulfur batteries are systematically investigated. The results show that specific capacity, cycling performance, and Coulombic efficiency of the batteries are closely linked to the pore structure and sulfur loading. An AG3/S composite electrode with a high sulfur loading of 72 wt.% exhibited an excellent long-term cycling stability (50% capacity retention over 1,000 cycles) and extra-low capacity fade rate (0.05% per cycle). In addition, when LiNO3was used as an electrolyte additive, the AG3/S electrode exhibited a similar capacity retention and high Coulombic efficiency (~98%) over 1,000 cycles. The excellent electrochemical performance of the series of AG3/S electrodes is attributed to the mixed micro/mesoporous structure, high surface area, and good electrical conductivity of the AG matrices and the well-distributed sulfur within the micro/mesopores, which is beneficial for electrical and ionic transfer during cycling.

Nano Res.2017,10(12), 4305–4317.IF = 7.354

文章链接：https://link.springer.com/article/10.1007/s12274-017-1659-3