Hollow-in-hollow carbon spheres with hollow foam-like cores for lithium–sulfur batteries
hollow spheres, porous carbon, sulfur/carbon cathode, lithium–sulfur batteries
Lithium–sulfur batteries have attracted increasing attention because of their high theoretical capacity. Using sulfur/carbon composites as the cathode materials has been demonstrated as an effective strategy to optimize sulfur utilization and enhance cycle stability as well. In this work, hollow-in-hollow carbon spheres with hollow foam-like cores (HCSF@C) are prepared to improve both capability and cycling stability of lithium–sulfur batteries. With high surface area and large pore volumes, the loading of sulfur in HCSF@C reaches up to 70 wt.%. In the resulting S/HCSF@C composites, the outer carbon shell serves as an effective protection layer to trap the soluble polysulfide intermediates derived from the inner component. Consequently, the S/HCSF@C cathode retains a high capacity of 780 mAh/g after 300 cycles at a high charge/discharge rate of 1 A/g.
Tsinghua University Press
Jun Zang,Taihua An,Yajie Dong,Xiaoliang Fang,Mingsen Zheng,Quanfeng Dong,Nanfeng Zheng, Hollow-in-hollow carbon spheres with hollow foam-like cores for lithium–sulfur batteries. NanoRes.2015, 8(8): 2663–2675