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Nano Research

Article Title

Boron-doped microporous nano carbon as cathode material for high-performance Li-S batteries

Authors

Feng Wu, Beijing Key Laboratory of Environmental Science and Engineering, School of Material Science and Engineering, Beijing Institute of Technology, Beijing 100081, China Collaborative Innovation Center of Electric Vehicles in Beijing, Beijing 100081, China
Ji Qian, Beijing Key Laboratory of Environmental Science and Engineering, School of Material Science and Engineering, Beijing Institute of Technology, Beijing 100081, China
Weiping Wu, School of Computer Science, Mathematics and Engineering, City, University of London, Northampton Square, London, EC1V 0HB, UK
Yusheng Ye, Beijing Key Laboratory of Environmental Science and Engineering, School of Material Science and Engineering, Beijing Institute of Technology, Beijing 100081, China
Zhiguo Sun, Beijing Key Laboratory of Environmental Science and Engineering, School of Material Science and Engineering, Beijing Institute of Technology, Beijing 100081, China
Bin Xu, State Key Laboratory of Chemical Resource Engineering, Beijing Key Laboratory of Electrochemical Process and Technology for Materials, Beijing University of Chemical Technology, Beijing 100029, China
Xiaoguang Yang, Research and Advanced Engineering, Ford Motor Company, MI 48121, USA
Yuhong Xu, Electrified Powertrain Engineering, Ford Motor Research and Engineering (Nanjing) Co. Ltd., Nanjing 211100, China
Jiatao Zhang, Beijing Key Laboratory of Construction-Tailorable Advanced Functional Materials and Green Applications, School of Material Science and Engineering, Beijing Institute of Technology, Beijing 100081, China
Renjie Chen, Beijing Key Laboratory of Environmental Science and Engineering, School of Material Science and Engineering, Beijing Institute of Technology, Beijing 100081, China Collaborative Innovation Center of Electric Vehicles in Beijing, Beijing 100081, China

Keywords

boron-doping, microporous carbon, binding energy, Li-S batteries

Abstract

ABSTRACT In this study, a boron-doped microporous carbon (BMC)/sulfur nanocomposite is synthesized and applied as a novel cathode material for advanced Li-S batteries. The cell with this cathode exhibits an ultrahigh cycling stability and rate capability. After activation, a capacity of 749.5 mAh/g was obtained on the 54th cycle at a discharge current of 3.2 A/g. After 500 cycles, capacity of 561.8 mAh/g remained (74.96% retention), with only a very small average capacity decay of 0.056%. The excellent reversibility and stability of the novel sulfur cathode can be attributed to the ability of the boron-doped microporous carbon host to both physically confine polysulfides and chemically bind these species on the host surface. Theoretical calculations confirm that boron-doped carbon is capable of significantly stronger interactions with the polysulfide species than undoped carbon, most likely as a result of the lower electronegativity of boron. We believe that this doping strategy can be extended to other metal-air batteries and fuel cells, and that it has promising potential for many different applications.

Graphical Abstract

Publisher

Tsinghua University Press

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