Physicochemical characterization of a new family of small alkyl phosphonium imide ionic liquids

Hilder, Matthias; Girard, Gaetan M. A.; Whitbread, Kristina; Zavorine, Serguei; Moser, Mike; Nucciarone, Donato; Forsyth, Maria; MacFarlane, Douglas R.; Howlett, Patrick C.

doi:10.1016/j.electacta.2016.03.130

Cited by 41 publications

(33 citation statements)

References 49 publications

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“…The first two values were in agreement with Tsunashima et al 17 and Girard et al 18 while the last value was in agreement with Hilder et al 19 As expected, the TFSI − -based ILs have higher m.p. than the FSIbased analogs.…”

Section: Resultssupporting

confidence: 81%

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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Section: Resultssupporting

confidence: 81%

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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“…35 The structure and purity of the products were confirmed using 1 H, 13 C, 31 was placed in a standard 5 mm glass sample tube and closed with a plastic stopper to avoid contact with air. Prior to measurements, the sample was equilibrated at a specific temperature for 30 min.…”

Section: Sample Preparationmentioning

confidence: 99%

“…11 Most of these ionic liquid electrolytes contain halogenated anions and different cations including pyrrolidinium, imidazolium, choline, and phosphonium. [12][13][14][15] There are a number of limitations of the conventional ionic liquid electrolytes that need to be tackled to improve the safety and performance of lithium-ion batteries. 16,17 (1) Most of the ionic liquid electrolytes contain halogenated anions such as BF 4 À , PF 6 improving the safety and performance of the batteries.…”

Section: Introductionmentioning

confidence: 99%

Ion dynamics in halogen-free phosphonium bis(salicylato)borate ionic liquid electrolytes for lithium-ion batteries

Shah

Гнездилов

Филиппов

2017

Phys. Chem. Chem. Phys.

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“…[23][24][25][26][27] The high concentration solution was chosen due its advantages (compared to the dilute electrolyte) of higher rates of Li transport, improved SEI properties and enhanced cycling performance of the lithium-metal anode. [25,[28][29] Here we demonstrate a significant ability of plating/ stripping lithium-metal in these polymer composites. Highly stable plating/stripping is shown in a selected composite with extensive amounts of charge plated/stripped, up to 0.5 mAh cm À2 .…”

Section: Introductionmentioning

confidence: 68%

“…A fixed amount of LiFSI was used in the electrolyte solution (ES): 3.8 mol kg −1 (3.8 m) is the maximum amount of Li salt that can be dissolved into the phosphonium IL (P 111i4 FSI). The phosphonium based IL was employed due to enhanced electrochemical, ion transport and thermal properties when compared to the more widely studied N ‐based ILs, they are also becoming more widely available and attracting research interest as high stability electrolytes . The high concentration solution was chosen due its advantages (compared to the dilute electrolyte) of higher rates of Li transport, improved SEI properties and enhanced cycling performance of the lithium‐metal anode ,…”

Section: Introductionmentioning

confidence: 99%

Sustainable, Dendrite Free Lithium‐Metal Electrode Cycling Achieved with Polymer Composite Electrolytes Based on a Poly(Ionic Liquid) Host

Girard

Wang

Yunis

et al. 2019

Batteries & Supercaps

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Polymer composite solid‐state electrolyte materials based on ionic liquids stand out as viable alternatives to flammable liquid electrolytes for solid state lithium‐metal batteries. They offer a compromise between favourable mechanical properties and stability against Li‐metal, coupled with favourable ion transport. However, insufficient Li+ transport properties for practical battery operation may result from the higher mobility of other ionic species from the ionic liquid (IL). Here, this issue was addressed by confining a highly concentrated IL electrolyte in a poly(ionic liquid) matrix with the addition of 5 wt % of alumina nanoparticles; these superconcentrated IL electrolytes favour Li+ ion transport. The composites are based on a poly(diallyldimethylammonium) bis(trifluoromethanesulfonyl)imide (PDADMA NTf2) matrix, and an electrolyte solution (ES) of high lithium concentration phosphonium IL, trimethyl(isobutyl)phosphonium bis(fluorosulfonyl)imide (P111i4FSI), with 3.8 mol kg−1 (3.8 m) LiFSI. The impact of ES content within the composite on Li+ transference number and electrochemical stability against Li‐metal is reported. For the 50 wt % ES and 50 wt % of PDADMA NTf2 composite, up to 0.5 mAh cm−2 of Li‐metal plating/stripping for over 20 days at 50 °C is shown. Scanning electron microscopy (SEM) confirmed that no Li dendrite formation was visible at the Li‐metal/polymer composite interface. Competitive performance of LiFePO4 electrodes (1.2 mAh cm−2) is also reported.

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Physicochemical characterization of a new family of small alkyl phosphonium imide ionic liquids

Cited by 41 publications

References 49 publications

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

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

Ion dynamics in halogen-free phosphonium bis(salicylato)borate ionic liquid electrolytes for lithium-ion batteries

Sustainable, Dendrite Free Lithium‐Metal Electrode Cycling Achieved with Polymer Composite Electrolytes Based on a Poly(Ionic Liquid) Host

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