TY  - JOUR
AU  - Yu, Huijuan
AU  - Li, Hanwen
AU  - Yuan, Shouyi
AU  - Yang, Yuchi
AU  - Zheng, Jiahui
AU  - Hu, Jianhua
AU  - Yang, Dong
AU  - Wang, Yonggang
AU  - Dong, Angang
PY  - 2017
TI  - Three-dimensionally ordered, ultrathin graphitic-carbon frameworks with cage-like mesoporosity for highly stable Li-S batteries
JO  - Nano Research
SN  - 1998-0124
SP  - 2495
EP  - 2507
VL  - 10
IS  - 7
AB  - Mesoporous carbons have been widely utilized as the sulfur host for lithium-sulfur (Li-S) batteries. The ability to engineer the porosity, wall thickness, and graphitization degree of the carbon host is essential for addressing issues that hamper commercialization of Li-S batteries, such as fast capacity decay and poor high-rate performance. In this work, highly ordered, ultrathin mesoporous graphitic-carbon frameworks (MGFs) having unique cage-like mesoporosity, derived from self-assembled Fe3O4 nanoparticle superlattices, are demonstrated to be an excellent host for encapsulating sulfur. The resulting S@MGFs exhibit high specific capacity (1, 446 mAh·g-1 at 0.15 C), good rate capability (430 mAh·g-1 at 6 C), and exceptional cycling stability (~0.049% capacity decay per cycle at 1 C) when used as Li-S cathodes. The superior electrochemical performance of the S@MGFs is attributed to the many unique and advantageous structural features of MGFs. In addition to the interconnected, ultrathin graphitic-carbon framework that ensures rapid electron and lithium-ion transport, the microporous openings between adjacent mesopores efficiently suppress the diffusion of polysulfides, leading to improved capacity retention even at high current densities.
UR  - https://doi.org/10.1007/s12274-017-1454-1
DO  - 10.1007/s12274-017-1454-1