Study on the Synthesis of Five 1,2-Dimethylimidazolium Type of Ionic Liquids and Their Application to Li/LiFeO4 Battery as Electrolytes

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	Study on the Synthesis of Five 1,2-Dimethylimidazolium Type of Ionic Liquids and Their Application to Li/LiFeO4 Battery as Electrolytes
	Cai Yan 1; Li Zaijun 1; Zhang Hailang 1; Fan Xu 1; Zhang Suojiang 2
刊名	ACTA CHIMICA SINICA
	2010-05-28
卷号	68 期号:10 页码:1017-1022
关键词	1-alky1-2 ionic liquid electrolyte 3-dimethylimidazolium bis(trifluoromethane sulfonyl)imide Li/LiFeO4 battery
ISSN号	0567-7351
其他题名	Acta Chim. Sin.
中文摘要	We designed and synthesized five new 1-alkyl-2,3-dimethylimidazolium bis(trifluoromethanesulfonyl)-imide room temperature ionic liquids in the work. Subsequently, these ionic liquids were developed as electrolytes for Li/LiFeO4 batteries to study on effect of the physical properties, interfacial and electrochemical performance by changing the alkyl chain. -butyl, -amyl, -octyl, -isooctyl and -decyl group. The results showed electrochemical windows of all ionic liquid are up to 5.6 V (similar to 0.4 similar to 5.2 V vs Li+/Li). The fact reveals the ionic liquid electrolytes are of excellent electrochemical stability. The ternary electrolyte will form fine solid electrolyte interphase film (SEI) on the surface of metallic lithium electrode in the presence of vinylene carbonate The SEI protects lithium foil to corrosion and enhances the stability of the Li electrode. Ac impedance spectroscopy and cyclic voltammetry analysis further demonstrate the ionic liquid electrolytes have also excellent compatibility with LiFeO4 electrode. Moreover, obvious dependence of the electrochemical properties on the alkyl in the ionic liquid was observed Li/LiFePO4 batteries with butyl-DMimTFSI and amyl-DMimTFSI as electrolytes exhibited better charge/discharge capacity and reversibility than that of other three ionic liquids. Their initial discharge capacity is about to 145 and 152.6 mAh/g and indicates excellent cycle reversibility. For the batteries with the electrolyte-based isooctyl-DMimTFSI ionic liquid, the initial discharge capacity is only 8.3 mAh.g(-1) due to its biggest viscosity However, it added dramatically to 132.4 mAh.g(-1) when 50% (w/w) propylene carbonate was introduced into the ternary electrolyte as diluent.
英文摘要	We designed and synthesized five new 1-alkyl-2,3-dimethylimidazolium bis(trifluoromethanesulfonyl)-imide room temperature ionic liquids in the work. Subsequently, these ionic liquids were developed as electrolytes for Li/LiFeO4 batteries to study on effect of the physical properties, interfacial and electrochemical performance by changing the alkyl chain. -butyl, -amyl, -octyl, -isooctyl and -decyl group. The results showed electrochemical windows of all ionic liquid are up to 5.6 V (similar to 0.4 similar to 5.2 V vs Li+/Li). The fact reveals the ionic liquid electrolytes are of excellent electrochemical stability. The ternary electrolyte will form fine solid electrolyte interphase film (SEI) on the surface of metallic lithium electrode in the presence of vinylene carbonate The SEI protects lithium foil to corrosion and enhances the stability of the Li electrode. Ac impedance spectroscopy and cyclic voltammetry analysis further demonstrate the ionic liquid electrolytes have also excellent compatibility with LiFeO4 electrode. Moreover, obvious dependence of the electrochemical properties on the alkyl in the ionic liquid was observed Li/LiFePO4 batteries with butyl-DMimTFSI and amyl-DMimTFSI as electrolytes exhibited better charge/discharge capacity and reversibility than that of other three ionic liquids. Their initial discharge capacity is about to 145 and 152.6 mAh/g and indicates excellent cycle reversibility. For the batteries with the electrolyte-based isooctyl-DMimTFSI ionic liquid, the initial discharge capacity is only 8.3 mAh.g(-1) due to its biggest viscosity However, it added dramatically to 132.4 mAh.g(-1) when 50% (w/w) propylene carbonate was introduced into the ternary electrolyte as diluent.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Chemistry, Multidisciplinary
研究领域[WOS]	Chemistry
关键词[WOS]	LITHIUM SECONDARY BATTERIES ; LI/LICOO2 CELL ; LI BATTERIES ; RTILS
收录类别	SCI
原文出处	://WOS:000278751500014
语种	英语
WOS记录号	WOS:000278751500014
公开日期	2013-11-28
内容类型	期刊论文
版本	出版稿
源URL	[http://ir.ipe.ac.cn/handle/122111/6495]
专题	过程工程研究所_研究所（批量导入）
作者单位	1.Jiangnan Univ, Sch Chem & Mat Engn, Wuxi 214122, Peoples R China 2.Chinese Acad Sci, Inst Proc Engn, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Cai Yan,Li Zaijun,Zhang Hailang,et al. Study on the Synthesis of Five 1,2-Dimethylimidazolium Type of Ionic Liquids and Their Application to Li/LiFeO4 Battery as Electrolytes[J]. ACTA CHIMICA SINICA,2010,68(10):1017-1022.
APA	Cai Yan,Li Zaijun,Zhang Hailang,Fan Xu,&Zhang Suojiang.(2010).Study on the Synthesis of Five 1,2-Dimethylimidazolium Type of Ionic Liquids and Their Application to Li/LiFeO4 Battery as Electrolytes.ACTA CHIMICA SINICA,68(10),1017-1022.
MLA	Cai Yan,et al."Study on the Synthesis of Five 1,2-Dimethylimidazolium Type of Ionic Liquids and Their Application to Li/LiFeO4 Battery as Electrolytes".ACTA CHIMICA SINICA 68.10(2010):1017-1022.