Boron-doped microporous nano carbon as cathode material for high-performance Li-S batteries |
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| Authors: | Feng Wu Ji Qian Weiping Wu Yusheng Ye Zhiguo Sun Bin Xu Xiaoguang Yang Yuhong Xu Jiatao Zhang Renjie Chen |
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| Affiliation: | 1. 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;2. Beijing Key Laboratory of Environmental Science and Engineering, School of Material Science and Engineering, Beijing Institute of Technology, Beijing 100081, China;3. School of Computer Science, Mathematics and Engineering, City, University of London, Northampton Square, London, EC1V0HB, 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, MI48121, 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 |
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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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| Keywords: | boron-doping microporous carbon binding energy Li-S batteries |
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