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Nano Research 2018, 11(9): 4562-4573 https://doi.org/10.1007/s12274-018-2036-6
Research Article | Issue | Published: 20 March 2018

Dual confinement of polysulfides in boron-doped porous carbon sphere/graphene hybrid for advanced Li-S batteries

Show Author's Information Wei Ai1,2,§,  Jiewei Li1,§,  Zhuzhu Du1,  Chenji Zou2,  Hongfang Du2,4,  Xin Xu2,  Yu Chen2,  Hongbo Zhang2,  Jianfeng Zhao1,  Changming Li4,  Wei Huang1,3( ),  Ting Yu2( )
Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM) Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM) Nanjing Tech University (NanjingTech) 30 South Puzhu RoadNanjing211816China
Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University 50 Nanyang AvenueSingapore637371Singapore
Shaanxi Institute of Flexible Electronics (SIFE) Northwestern Polytechnical University (NPU) 127 West Youyi RoadXi’an710072China
Institute for Clean Energy & Advanced Materials Southwest UniversityChongqing400715China

§ Wei Ai and Jiewei Li contributed equally to this work.

Keywords:
graphene, Li-S batteries, carbon spheres, potato starch, boron doping
Cite this article:
Ai W, Li J, Du Z, et al. Dual confinement of polysulfides in boron-doped porous carbon sphere/graphene hybrid for advanced Li-S batteries. Nano Research, 2018, 11(9): 4562-4573. https://doi.org/10.1007/s12274-018-2036-6
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Abstract Full text Electronic supplementary material About this article

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.


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About this article

Dual confinement of polysulfides in boron-doped porous carbon sphere/graphene hybrid for advanced Li-S batteries

Show Author's information Wei Ai1,2,§, Jiewei Li1,§, Zhuzhu Du1, Chenji Zou2, Hongfang Du2,4, Xin Xu2, Yu Chen2, Hongbo Zhang2, Jianfeng Zhao1, Changming Li4, Wei Huang1,3( ), Ting Yu2( )
Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM) Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM) Nanjing Tech University (NanjingTech) 30 South Puzhu RoadNanjing211816China
Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University 50 Nanyang AvenueSingapore637371Singapore
Shaanxi Institute of Flexible Electronics (SIFE) Northwestern Polytechnical University (NPU) 127 West Youyi RoadXi’an710072China
Institute for Clean Energy & Advanced Materials Southwest UniversityChongqing400715China

§ Wei Ai and Jiewei Li contributed equally to this work.

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.

Keywords: graphene, Li-S batteries, carbon spheres, potato starch, boron doping

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Publication history
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Acknowledgements

Publication history

Received: 13 September 2017
Revised: 01 February 2018
Accepted: 11 February 2018
Published: 20 March 2018
Issue date: September 2018

Copyright

© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Acknowledgements

Acknowledgements

T. Y. acknowledges the supports by MOE Tier 1 (Nos. RG100/15, RG178/15 and RG22/16). W. H. thanks the supports by the National Basic Research Program of China-Fundamental Studies of Perovskite Solar Cells (No. 2015CB932200), Natural Science Foundation of Jiangsu Province (No. BM2012010), Priority Academic Program Development of Jiangsu Higher Education Institutions (No. YX03001), Ministry of Education of China (No. IRT1148), Synergetic Innovation Center for Organic Electronics and Information Displays, and the National Natural Science Foundation of China (Nos. 61136003 and 51173081). J. W. L. thanks the supports from the National Natural Science Foundation of China (No. 21603104). J. F. Z. thanks the supports from the National Natural Science Foundation of China (No. 21502091), Natural Science Foundation of Jiangsu Province (Nos. BK20130912 and 14KJB430017).

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