Research Article

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2017, 10(2): 426–436

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https://doi.org/10.1007/s12274-016-1303-7

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

Feng Wu1,2,§, Ji Qian1,§, Weiping Wu3, Yusheng Ye1, Zhiguo Sun1, Bin Xu4, Xiaoguang Yang5, Yuhong Xu6, Jiatao Zhang7, and Renjie Chen1,2 (*)

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1 Beijing Key Laboratory of Environmental Science and Engineering, School of Material Science and Engineering, Beijing Institute of Technology, Beijing 100081, China
2 Collaborative Innovation Center of Electric Vehicles in Beijing, Beijing 100081, China
3 School of Computer Science, Mathematics and Engineering, City, University of London, Northampton Square, London, EC1V 0HB, UK
4 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
5 Research and Advanced Engineering, Ford Motor Company, MI 48121, USA
6 Electrified Powertrain Engineering, Ford Motor Research and Engineering (Nanjing) Co. Ltd., Nanjing 211100, China
7 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
§ These authors contributed equally to this work.

Keywords: boron-doping, microporous carbon, binding energy, Li-S batteries
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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.
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Boron-doped microporous nano carbon as cathode material for high-performance Li-S batteries. Nano Res. 2017, 10(2): 426–436 https://doi.org/10.1007/s12274-016-1303-7

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