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

Chem. J. Chinese Universities ›› 2011, Vol. 32 ›› Issue (4): 797.

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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 Feng^1*, XU Bin², LI Li¹, CHEN Shi¹

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.

Abstract

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

CLC Number:

O646

TrendMD:

CHEN Ren-Jie, ZHANG Hai-Qin, WU Feng*, XU Bin, LI Li, CHEN Shi. Electrochemical Performance Matching Between LiTFSI/2-Oxazolidinone Complex Electrolyte and Various Carbon Materials with Different Pore Size and Surface Area[J]. Chem. J. Chinese Universities, 2011, 32(4): 797.

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

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