Ionic liquid electrolyte of lithium bis(fluorosulfonyl)imide/N-methyl-N-propylpiperidinium bis(fluorosulfonyl)imide for Li/natural graphite cells: Effect of concentration of lithium salt on the physicochemical and electrochemical properties

CORC > 物理研究所 > 物理所公开发表论文 > 期刊论文

	Ionic liquid electrolyte of lithium bis(fluorosulfonyl)imide/N-methyl-N-propylpiperidinium bis(fluorosulfonyl)imide for Li/natural graphite cells: Effect of concentration of lithium salt on the physicochemical and electrochemical properties
	Liu, CY ; Ma, XD ; Xu, F ; Zheng, LP ; Zhang, H ; Feng, WF ; Huang, XJ ; Armand, M ; Nie, J ; Chen, HL ; Zhou, ZB
刊名	ELECTROCHIMICA ACTA
	2014
卷号	149 页码:370
关键词	Ionic liquids Electrolyte Lithium bis(fluorosulfonyl)imide N-methyl-N-propylpiperidinium bis(fluorosulfonyl)imide Li-ion battery
ISSN号	0013-4686
通讯作者	Feng, WF (reprint author), Huazhong Univ Sci & Technol, Key Lab Large Format Battery Mat & Syst, Minist Educ, Sch Chem & Chem Engn, 1037 Luoyu Rd, Wuhan 430074, Peoples R China.
中文摘要	Binary electrolytes, comprising of lithium bis(fluorosulfonyl) imide (LiFSI) and ionic liquids (ILs) of N-methyl-N-propylpiperidinium bis(fluorosulfonyl) imide (PI13FSI) with various concentrations of LiFSI (i.e., LiFSI/PI13FSI in 0.05:1, 0.1:1, 0.2:1, 0.5:1, 0.8:1 and 1:1, by mole) have been investigated as electrolyte for Li-ion cells, in terms of phase behavior, thermal stability, density, viscosity, ionic conductivity, lithium-ion transference number, and electrochemical behaviors on Al, Pt, Ni, and composite natural graphite electrodes, with particular attention to the effect of concentration of LiFSI in PI13FSI on these properties. The stability of Al in the high potential region (3.05.0 V vs. Li/Li+) has been confirmed in these electrolytes using cyclic voltammetry, chronoamperometry and SEM morphology. The anodic stability of these electrolytes on Pt electrode has been little affected by addition of LiFSI. Li deposition/stripping on Ni electrode shows low columbic efficiencies (< 45%) in these electrolytes, due to the continuous reduction of FSI-anions and PI13+ cations. Reduction of FSI-anions for forming solid electrolyte interphase (SEI) films on the graphite is observed at ca. 2.0 V (vs. Li/Li+), followed by intercalation of Li+ ions and IL cations into graphite in these electrolytes at the first cathodic scan in CV measurements. The performances of SEI films formed on the graphite highly depend on the concentration of LiFSI, and a stable Li-ion conducting SEI film can only be formed in the electrolyte containing a high concentration of LiFSI. Li/natural graphite cell using LiFSI-PI13FSI (1:1, by mole) as electrolyte displays high specific capacities (> 360 mAh g(-1)) and columbic efficiencies (> 99%) after conditioning, except for a large irreversible capacity (139 mAh g(-1)) observed at the first cycle. Analyses of XPS and electrochemical impedance spectra reveal that a stable Li-ion conducting SEI film, mainly comprising reduction products of FSI-anions (e.g., LiF, LiOH, Li2SO3, and species containing NSO2-, FSO2-, and N-), has been formed on the graphite.
资助信息	National Natural Science Foundation of China [51203057]
语种	英语
公开日期	2015-04-14
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/59058]
专题	物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文
推荐引用方式 GB/T 7714	Liu, CY,Ma, XD,Xu, F,et al. Ionic liquid electrolyte of lithium bis(fluorosulfonyl)imide/N-methyl-N-propylpiperidinium bis(fluorosulfonyl)imide for Li/natural graphite cells: Effect of concentration of lithium salt on the physicochemical and electrochemical properties[J]. ELECTROCHIMICA ACTA,2014,149:370.
APA	Liu, CY.,Ma, XD.,Xu, F.,Zheng, LP.,Zhang, H.,...&Zhou, ZB.(2014).Ionic liquid electrolyte of lithium bis(fluorosulfonyl)imide/N-methyl-N-propylpiperidinium bis(fluorosulfonyl)imide for Li/natural graphite cells: Effect of concentration of lithium salt on the physicochemical and electrochemical properties.ELECTROCHIMICA ACTA,149,370.
MLA	Liu, CY,et al."Ionic liquid electrolyte of lithium bis(fluorosulfonyl)imide/N-methyl-N-propylpiperidinium bis(fluorosulfonyl)imide for Li/natural graphite cells: Effect of concentration of lithium salt on the physicochemical and electrochemical properties".ELECTROCHIMICA ACTA 149(2014):370.