@article{Ai2018, 
author = {Wei Ai and Jiewei Li and Zhuzhu Du and Chenji Zou and Hongfang Du and Xin Xu and Yu Chen and Hongbo Zhang and Jianfeng Zhao and Changming Li and Wei Huang and Ting Yu},
title = {Dual confinement of polysulfides in boron-doped porous carbon sphere/graphene hybrid for advanced Li-S batteries},
year = {2018},
journal = {Nano Research},
volume = {11},
number = {9},
pages = {4562-4573},
keywords = {potato starch, carbon spheres, graphene, boron doping, Li-S batteries},
url = {https://www.sciopen.com/article/10.1007/s12274-018-2036-6},
doi = {10.1007/s12274-018-2036-6},
abstract = {A hybrid structure consisting of boron-doped porous carbon spheres and graphene (BPCS-G) has been designed and synthesized toward solving the polysulfide-shuttle problem, which is the most critical issue of current Li-S batteries. The proposed hybrid structure showing high surface area (870 m2·g-1) and high B-dopant content (6.51 wt.%) simultaneously offers both physical confinement and chemical absorption of polysulfides. On one hand, the abundant-pore structure ensures high sulfur loading, facilitates fast charge transfer, and restrains polysulfide migration during cycling. On the other hand, our density functional theory calculations demonstrate that the B dopant is capable of chemically binding polysulfides. As a consequence of such dual polysulfide confinement, the BPCS-G/S cathode prepared with 70 wt.% sulfur loading presents a high reversible capacity of 1, 174 mAh·g-1 at 0.02 C, a high rate capacity of 396 mAh·g-1 at 5 C, and good cyclability over 500 cycles with only 0.05% capacity decay per cycle. The present work provides an efficient and cost-effective platform for the scalable synthesis of high-performance carbon-based materials for advanced Li-S batteries.}
}