Room Temperature Ionic Liquid Electrolytes Based on Azepanium Imide Salts for Lithium Batteries

Salem, Nuha; Nicodemou, Lucas; Abu-Lebdeh, Yaser; Davidson, Isobel

doi:10.1149/2.102202jes

Cited by 16 publications

(17 citation statements)

References 24 publications

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“…The LSV curves of the IM(2o1)1R series were shown as examples in Figure . Usually, for the same kind of ILs, when the R substituent in the cation structure varies, the cathodic stability or anodic stability will be changed, which was reported in many papers. − The cathodic limiting potentials of IM(2o1)12TFSA and IM(2o1)13TFSA were about −2.4 and −2.3 V versus Ag/Ag + , and their anodic limiting potentials were about +1.9 and +2.2 V versus Ag/Ag + , so their electrochemical windows were about 4.3 and 4.5 V, respectively.…”

Section: Resultsmentioning

confidence: 94%

Ether-Functionalized Trialkylimidazolium Ionic Liquids: Synthesis, Characterization, and Properties

Jin

Fang

Chai

et al. 2012

Ind. Eng. Chem. Res.

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A family of new ether-functionalized ILs based on trialkylimidazolium cations with one or two ether groups and TFSA − anion was synthesized and characterized. Their properties including melting point, thermal stability, viscosity, conductivity, and electrochemical windows were determined and compared to those of the trialkylimidazolium ILs without ether group. The relationship between the cations structure and IL physicochemical properties was systematically studied. Most of these ether-functionalized ILs were liquids at room temperature, and the melting points of 21 ILs were lower than −60 °C. At room temperature, 26 ILs owned the viscosities lower than 100 mPa s, and the viscosities of IM(2o1)12TFSA and IM(2o2)12TFSA were 57.4 and 54.4 mPa s.

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Section: Resultsmentioning

confidence: 94%

Ether-Functionalized Trialkylimidazolium Ionic Liquids: Synthesis, Characterization, and Properties

Jin

Fang

Chai

et al. 2012

Ind. Eng. Chem. Res.

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“…20 These values illustrate the crucial effect of the size and shape of the cation in combination with the size and shape of the anion on the packing and crystallization behavior of the salt. 21 It was also observed that P 1113 FSI was the only ionic liquid that showed extra peaks below melting that can be attributed to the presence of other phases/crystalline structures of lower melting points or due to a solid-solid transition corresponding to a regular crystalline to plastic crystalline phase. 22 When LiPF 6 salt was added (to the molten state in case of P 111i4 TFSI), the m.p.…”

Section: Resultsmentioning

confidence: 98%

Physical and Electrochemical Properties of Some Phosphonium-Based Ionic Liquids and the Performance of Their Electrolytes in Lithium-Ion Batteries

Salem

Zavorine

Nucciarone

et al. 2017

J. Electrochem. Soc.

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In this work, three ionic liquids with two different cations and two different anions: trimethyl propyl phosphonium bis-fluorosulfonyl imide (P 1113 FSI), trimethyl isobutyl phosphonium bis-fluorosulfonyl imide (P 111i4 FSI) and trimethyl isobutyl phosphonium bistrifluoromethylsulfonyl imide (P 111i4 TFSI) have been characterized and evaluated as electrolytes in lithium ion half-cells. It is found that ionic liquids with FSI − anion have superior properties over their TFSI − counterparts and those with the smaller cation, P 1113 , have better conductivity and viscosity. The two ionic liquids with FSI anion, P 1113 FSI and P 111i4 FSI, are liquid at room temperature and show high conductivities and low viscosities, reaching 10.0 mS/cm and 30 cP at room temperature for P 1113 FSI. They also exhibit electrochemical windows higher than 5 V and thermal stability exceeding 300 • C. Mixing the ionic liquids with 0.5 M LiPF 6 increases viscosities, lowers conductivities but improves electrochemical cathodic stability. The electrolyte mixtures have been evaluated in graphite/Li half cells, Li/LiFePO 4 and Li/LiMn 1.5 Ni 0.5 O 4 at C/12 for 100 cycles and at different rates: C/6, C/3, C and 2C for rate capabilities. Battery testing shows that unlike their TFSI − counterparts both ionic liquids with FSI − anion perform well with graphite anode and LiFePO 4 cathode but fail with the higher voltage LiMn Li-ion batteries have attracted a lot of attention since their successful application in portable consumer electronics mainly because of their unique properties such as high energy density and long cycle life. Since then, and due to increased market demand, interest has been drawn toward investigating Li-ion batteries as candidates for use in more energy-demanding applications such as electric vehicles (EV, HEV, PHEV) and large energy storage systems for the electrical grid.1-5 One important aspect of such investigation is to develop new and improved materials for Li-ion batteries to enhance their properties in terms of safety and performance, which is crucial to match the new demand. There have been a large number of studies on the anode, cathode and electrolyte components of Li-ion batteries for this purpose in recent years. Electrolyte solutions used in Li-ion batteries are usually composed of a lithium salt (LiPF 6 ) dissolved in a mixture of two or more carbonate solvents such as ethylene carbonate (EC) and dimethyl carbonate (DMC).6 These solvents are known to have safety concerns due to their flammability, volatility and reactivity to other battery components prompting an increased effort on finding safer alternatives. 7 In the last decade, a group of compounds called ionic liquids (ILs), has been of interest as an alternative to conventional battery electrolytes due to their excellent thermal and physiochemical properties such as non-flammability, negligible vapor pressure, good dissolution power, good electrochemical stability, wide liquid range and intrinsic ionic conductivity.7-13 Despite these aforementioned prope...

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“…A series of azepanium with larger heterocyclic rings were synthesized by Salem et al, who found that asymmetric substituents on N afforded liquids of lower melting points. 364 The electrochemical cycling of corresponding RTIL based on these azepaniums was conducted with various anode (graphite and Li 4 Ti 5 O 12 ) and cathode (LiFePO 4 and LiCoO 2 ) chemistries, and it seemed that the extreme potentials of graphite (0.2 V) and LiCoO 2 (4.2 V) still presented a challenge to the stabilities of these RTIL. Further studies were needed to fully justify their practicality.…”

Section: Ionic Liquidsmentioning

confidence: 99%

Electrolytes and Interphases in Li-Ion Batteries and Beyond

2014

Chem. Rev.

4,188

3,989

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Room Temperature Ionic Liquid Electrolytes Based on Azepanium Imide Salts for Lithium Batteries

Cited by 16 publications

References 24 publications

Ether-Functionalized Trialkylimidazolium Ionic Liquids: Synthesis, Characterization, and Properties

Ether-Functionalized Trialkylimidazolium Ionic Liquids: Synthesis, Characterization, and Properties

Physical and Electrochemical Properties of Some Phosphonium-Based Ionic Liquids and the Performance of Their Electrolytes in Lithium-Ion Batteries

Electrolytes and Interphases in Li-Ion Batteries and Beyond

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