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

作　　者：Feng Wu Ji Qian Weiping Wu Yusheng Ye Zhiguo Sun Bin Xu Xiaoguang Yang Yuhong Xu Jiatao Zhang Renjie Chen 

机构地区：[1]Beijing Key Laboratory of Environmental Science and Engineering, School of Material Science and Engineering, Beijing Institute ofTechnology, Beijing 10008 I, China [2]Collaborative Innovation Center of Electric Vehicles in 8eijing, Beijing 100081, China [3]School of Computer Science, Mathematics and Engineering, City, University of London, Northampton Square, London, EC 1 V OHB, UK [4]State Key Laboratory of Chemical Resource Engineering, Beijing Key Laboratory of Electrochemical Process and Technology for Materials, 8eijing University of Chemical Technology, 8eijing 100029, China [5]Research and Advanced Engineering, Ford Motor Company, M148121, 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 MaterialScience and Engineering, 8eijing Institute of Technology, Beijing 100081, China

出　　处：《Nano Research》2017年第2期426-436,共11页纳米研究（英文版）

摘　　要：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 54t＂ 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.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 54t＂ 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.

关 键 词：BORON-DOPING microporous carbon binding energy Li-S batteries 

分 类 号：O[理学]