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电化学(中英文) ›› 2013, Vol. 19 ›› Issue (6): 544-549.  doi: 10.13208/j.electrochem.130363

• 锂离子电池近期研究专辑 (厦门大学 杨勇教授主编) • 上一篇    下一篇

介孔碳/硫复合材料(CxSy)与室温钠硫电池

赵庆,胡宇翔,张凯,王利江,陶占良,陈军*   

  1. 南开大学先进能源材料化学教育部重点实验室,天津 300071
  • 收稿日期:2013-06-26 修回日期:2013-07-17 出版日期:2013-12-28 发布日期:2013-12-23
  • 通讯作者: 陈军 E-mail:chenabc@nankai.edu.cn
  • 基金资助:

    国家纳米重大科学研究计划(No. 2011CB935900)和国家自然科学基金项目(No. 21231005)资助

CMK-3/Sulfur Composite (CxSy) and Room-Temperature Na/S Battery

ZHAO Qing, HU Yu-Xiang, ZHANG Kai, WANG Li-Jiang, TAO Zhan-Liang, CHEN Jun*   

  1. Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), College of Chemistry, Nankai University, No. 94 Weijin Road, Tianjin 300071, China
  • Received:2013-06-26 Revised:2013-07-17 Published:2013-12-28 Online:2013-12-23
  • Contact: CHEN Jun E-mail:chenabc@nankai.edu.cn

摘要: 通过熔融扩散法合成了一系列不同含硫量的有序介孔碳(CMK-3)/硫复合材料(CxSy). 采用X射线衍射(XRD)、拉曼光谱(Raman)、比表面积测定仪(BET)、扫描电镜(SEM)、透射电镜(TEM)分析、表征和观察样品. 将复合材料组装成钠硫电池,室温下测试电化学性能. 循环伏安(CV)曲线结果表明,室温钠硫电池在1.61 V处有一个还原峰,对应于Na2Sx(x = 2 ~ 5)的形成;在1.82 V和1.95 V分别有一个氧化峰,对应于Na2Sx(x = 2 ~ 5)的分解. 50 wt%硫含量(C1S1)电极0.05C(1C=558 mA·g-1)倍率首周放电容量500 mAh·g-1,50周期循环比容量为305.6 mAh·g-1. 交流阻抗数据拟合计算其表观活化能为21.83 kJ·mol-1. 本研究可为室温钠硫电池多孔电极材料的研究提供一定的指导作用.

关键词: 有序介孔碳, CMK-3/硫复合材料, 室温, 钠硫电池

Abstract: A series of ordered mesoporous carbon (CMK-3)/sulfur composite (CxSy) with different sulfur contents were synthesized via a melt-diffusion method. XRD, Raman, BET, SEM, and TEM techniques were used to characterize the structure and morphology of the as-prepared composite. The electrochemical performance of CMK-3/sulfur composite as the electrode of Na/S battery was tested at room temperature. Cyclic voltammograms show that one obvious reduction peak was located at about 1.61V, which is corresponding to the formation of Na2Sx (x=2~5), while two oxidation peaks were displayed at about 1.82V and 1.95V, which are belonging to the decomposition of Na2Sx (x=2~5). When the sulfur content in CMK-3/sulfur composite was 50 wt% (C1S1), the discharge capacity reached 500 mAh·g-1 under 0.05C (1C=558 mAh·g-1) rate in the first cycle and the capacity became 305.6 mAh·g?1 after 50 cycles. From the result of EIS tested at about 1.6 V under different temperatures, the activation energy was calculated to be 21.83 kJ·mol-1. This result provides the basis for further study of porous electrode materials for room-temperature Na/S battery.

Key words: ordered mesoporous carbon, CMK-3/S composite, room-temperature, Na/S battery

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