高等学校化学学报 ›› 2011, Vol. 32 ›› Issue (4): 797.

• 研究快报 • 上一篇    下一篇

LiTFSI/2-噁唑烷酮电解液与不同微结构碳材料的电化学兼容性

陈人杰1,张海琴1,吴锋1,徐斌2,李丽1,陈实1   

  1. 1. 北京理工大学化工与环境学院, 北京环境科学与工程重点实验室, 北京   100081;
    2. 防化研究院, 北京   100081
  • 收稿日期:2010-11-29 修回日期:2011-01-18 出版日期:2011-04-10 发布日期:2011-03-09
  • 通讯作者: 吴锋 E-mail:wufeng863@bit.edu.cn
  • 基金资助:

    国家重点基础研究发展计划项目(批准号: 2009CB220100)、 国家自然科学基金(批准号: 20803003)、 国家国际科技合作计划(批准号: 2010DFB63370)、 教育部新世纪优秀人才支持计划(批准号: NCET-10-00382006)和北京市优秀人才培养资助项目(批准号: 2010D009011000005)资助.

Electrochemical Performance Matching Between LiTFSI/2-Oxazolidinone Complex Electrolyte and Various Carbon Materials with Different Pore Size and Surface Area

CHEN Ren-Jie1, ZHANG Hai-Qin1, WU Feng1*, XU Bin2, LI Li1, CHEN Shi1   

  1. 1. School of Chemical Engineering and the Environment, Beijing Key Laboratory of Environmental Science and Engineering, Beijing Institute of Technology, Beijing 100081, China;
    2. Research Institute of Chemical Defense, Beijing 100083, China
  • Received:2010-11-29 Revised:2011-01-18 Online:2011-04-10 Published:2011-03-09
  • Contact: WU Feng E-mail:wufeng863@bit.edu.cn
  • Supported by:

    国家重点基础研究发展计划项目(批准号: 2009CB220100)、 国家自然科学基金(批准号: 20803003)、 国家国际科技合作计划(批准号: 2010DFB63370)、 教育部新世纪优秀人才支持计划(批准号: NCET-10-00382006)和北京市优秀人才培养资助项目(批准号: 2010D009011000005)资助.

摘要: 二(三氟甲基磺酸酰)亚胺锂(LiTFSI)与1,3-氮氧杂环戊-2-酮(OZO)形成的离子液体具有良好的物理和电化学性能,表现出宽的液相温度范围和高的离子电导率,可满足超级电容器的应用需求。本文制备的LiTFSI-OZO离子液体体系中,各种离子的结构组成(如自由离子、离子对、积聚离子)及其之间的相互作用对离子液体的电化学性能具有较大的影响,将其作为电解液应用于不同微结构特性(孔径、比表面积等)的炭材料(碳纳米管(CNTs)、中孔活性炭(MEACs)和微孔活性炭(MIACs))作为电极的电化学双层电容器中,电化学兼容性研究表明,由于中孔活性炭电极材料有最大的比表面积及最适宜的孔径分布,相应的模拟电容具有最高的比容量184.6 F?g-1。该研究表明,对电极材料的微结构特性与离子液体离子尺度进行优化匹配是实现离子液体作为电解液应用于超级电容器的关键。

关键词: 离子液体, 电解液, 超级电容器, 中孔活性炭

Abstract: Ionic liquids based on lithium bis(trifluoromethane sulfone)imide (LiTFSI) with 2-oxazolidinone (OZO) exhibit superior physicochemical properties, such as a wide liquid-phase range and high ionic conductivity, that make them useful electrolytes in electrochemical capacitors. The configurations of ions (“free” ions, contact ion pairs and aggregates) in the electrolyte and their interactions have an important influence on the electrochemical performance of the LiTFSI-OZO system. Electrochemical double layer capacitors (EDLCs) composed of various carbon electrodes with different pore sizes and surface areas (carbon nanotubes, mesoporous activated carbons (MEACs) and microporous activated carbons) and the LiTFSI-OZO system as the electrolyte are prepared. Electrochemical performance matching of the EDLCs indicate that the one containing MEACs, which have the largest surface area and most compatible pore size of the carbon materials, possesses the highest specific capacitance of 184.6 F?g-1. This work shows that it is necessary to closely match the pore sizes of electrode materials with the ion sizes of the electrolyte system to optimize the performance of novel room temperature ionic liquids. Keywords Ionic liquid; Electrolyte; Supercapacitor; Mesoporous carbon

Key words: Ionic liquid, Electrolyte, Supercapacitor, Mesoporous carbon

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