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Applied surface science v.433, 2018년, pp.713 - 722   SCI SCIE
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Fabrication of porous carbon sphere@SnO2@carbon layer coating composite as high performance anode for sodium-ion batteries

Li, Xin (School of Materials Science and Engineering, Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education, Tianjin University, Tianjin 300072, PR China ) ; Sun, Xiaohong (School of Materials Science and Engineering, Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education, Tianjin University, Tianjin 300072, PR China ) ; Gao, Zhiwen (School of Materials Science and Engineering, Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education, Tianjin University, Tianjin 300072, PR China ) ; Hu, Xudong (School of Materials Science and Engineering, Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education, Tianjin University, Tianjin 300072, PR China ) ; Guo, Jingdong (School of Materials Science and Engineering, Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education, Tianjin University, Tianjin 300072, PR China ) ; Cai, Shu (School of Materials Science and Engineering, Key Laboratory of Advanced Ceramics and Machining Technology ) ; Guo, Ruisong ; Ji, Huiming ; Zheng, Chunming ; Hu, Wenbin ;
  • 초록  

    Abstract SnO 2 has triggered lots of research efforts as anode for sodium-ion batteries. However, the volume expansion and poor conductivity lead to an unsatisfactory electrochemical performance for the practical application of SnO 2 . In this work, a novel carbon-coated SnO 2 supported by porous carbon sphere composite is synthesized by hydrothermal process combining with annealing method. The porous carbon sphere@SnO 2 @carbon layer coating composite anode delivers a reversible capacity of 326mAhg −1 over 80 cycles at a current density of 50mAg −1 . Even at 1600mAg −1 , a capacity of 82mAhg −1 is still maintained after 550 cycles. Such excellent performance can be ascribed to the unique structure, which efficiently accommodates volume expansion, enhances conductivity and offers shortened sodium-ion transport pathway. The charge-storage mechanisms can be comprised of diffusion-controlled reaction and pseudocapacitance effect. At high scan rate of 1.0mVs −1 , the capacity contribution of pseudocapacitance effect could reach as high as 78%. Highlights Porous carbon sphere@SnO 2 @carbon layer coating composite is fabricated. Good cycling performance and rate capability is achieved for sodium-ion batteries. Enhanced conductivity and encapsulation of active materials are realized. Pseudocapacitance effect contribution are quantified at various scan rates. Graphical abstract [DISPLAY OMISSION]


  • 주제어

    SnO2 .   Porous carbon sphere .   Nano-scale carbon layer .   Pseudocapacitance effect .   Sodium-ion battery.  

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