Liquid electrolytes based on new lithium conductive imidazole salts

Niedzicki, Leszek; Kasprzyk, Marta; Kuziak, K.; Żukowska, G.Z.; Marcinek, Marek; Wieczorek, W.; Armand, Michel

doi:10.1016/j.jpowsour.2010.08.097

Cited by 53 publications

(47 citation statements)

References 25 publications

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“…Although the direct determination of the transference number introduced in the section Direct determination of the transference number by steady-state polarization experiments has initially been developed for polymer electrolytes, it is also often applied for liquid electrolytes, [28][29][30] ionic liquids 31 or mixtures of both, 32 even though it strictly is valid only for dilute solutions and cannot be applied to concentrated solutions due to a violation of the underlying assumptions as indicated in the section Direct determination of the transference number by steady-state polarization experiments. It is also shown that the experimental setup of the polarization cell with two lithium metal electrodes and the LiClO 4 electrolyte, as used in this contribution, is not suitable for low salt concentrations, since a constant electrolyte resistance cannot be guaranteed.…”

Section: Resultsmentioning

confidence: 99%

Determination of Transport Parameters in Liquid Binary Electrolytes: Part II. Transference Number

Ehrl

Landesfeind

Wall

et al. 2017

J. Electrochem. Soc.

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In the literature, various numerical methods for the simulation of ion-transport in concentrated binary electrolytes for lithium ion batteries can be found, whereas the corresponding transport parameters are rarely discussed. In this contribution, a novel method for the determination of the transference number in non-aqueous electrolytes is proposed. The method is based on data from a concentration cell and on the value of the thermodynamic factor obtained from independent measurements based on quantifying the redox potential of ferrocene. The concentration dependent transference numbers obtained by this new method are compared to values obtained by the classical approach, which is based on experiments in a polarization cell and a concentration cell. For the latter, a set of commonly used and some newly proposed analysis methods as well as their theoretical justification are discussed. Using an exemplary electrolyte (lithium perchlorate in a mixture of ethylene carbonate and diethyl carbonate), we will demonstrate that our newly proposed method based on concentration cell experiments and a thermodynamic factor derived from independent measurements is a more accurate approach for obtaining concentration dependent transference numbers. At the end, the experimentally determined concentration dependent transference numbers are compared to data available in the literature.

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Section: Resultsmentioning

confidence: 99%

Determination of Transport Parameters in Liquid Binary Electrolytes: Part II. Transference Number

Ehrl

Landesfeind

Wall

et al. 2017

J. Electrochem. Soc.

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“…These models do not fit accurately our data, thus we decided to use a modified semi-empirical version of the Fuoss-Kraus model, which provides a quantitative estimation of the ionic fractions in solution from conductivity measurements [16]. This model is widely used for polyelectrolytes-based systems [38][39][40]. The method requires the determination of the limiting conductivities, then the calculation of ion pair and triplets conditional formation constants and finally the fractions of triplets, ion pairs and "free" ions as a function of the salt concentration [41].…”

Section: Appendix a Casteel-amis Equation And Fuoss-kraus Formalismmentioning

confidence: 99%

The curious effect of potassium fluoride on glycerol carbonate. How salts can influence the structuredness of organic solvents

Sarri

Tatini

Ambrosi

et al. 2018

Journal of Molecular Liquids

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Glycerol carbonate (4-hydroxymethyl-1,3-dioxolan-2-one, shortly GC) is a dense, viscous, water soluble solvent. The high dielectric constant and dipole moment make it a suitable non-aqueous green solvent for several salts in different applications. GC dissolves significant amounts of inorganic salts such as KF. The saturation of GC with KF leads to the formation of a viscous liquid at room temperature. In this paper, we report on conductivity, rheology, differential scanning calorimetry and infrared spectroscopy experiments that indicate the formation of a glassy liquid where GC molecules and KF ion pairs are intercalated in a firm and ordered bidimensional structure, stabilized by hydrogen bonding and strong ion-dipole interactions.

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“…Apart from those known before 1990 (LiClO 4 -too volatile with cathodic materials also being considered as an explosive, LiAsF 6 -too toxic for application, LiCF 3 SO 3 -unsatisfactory low ionic conductivity, LiBF 4 -formed highly resistive solid electrolyte interface), so far there were only few new lithium salts introduced such as imide salts, methide salts, orthoborate chelate-type class salts and phosphate salts [11,12]. Recent success of imidazole-derived lithium salts [13] and stressed as ''tailor made'' salts, notably LiTDI (lithium 4,5-dicyano-2-(trifluoromethyl)imidazole), has encouraged us for lithium battery applications [14]. For exploring the properties of this salt, only a few publications are available [15,16].…”

Section: Introductionmentioning

confidence: 99%

New solid polymer electrolytes (PEO20–LiTDI–SN) for lithium batteries: structural, thermal and ionic conductivity studies

Polu

Rhee

Kim

2015

J Mater Sci: Mater Electron

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Solid polymer electrolyte films based on Poly(ethylene oxide) (PEO) have been prepared by solution casting technique using acetonitrile as a solvent. Succinonitrile (SN) was used as a plasticizer and lithium 4,5-dicyano-2-(trifluoromethyl)imidazole (LiTDI) as a doping salt. The following techniques such as X-ray diffraction (XRD), differential scanning calorimetry (DSC), thermo gravimetric analysis, AC-impedance analysis and linear sweep voltametry have been employed to characterize the prepared solid polymer electrolyte films. The crystalline and amorphous nature of polymer electrolytes was confirmed by XRD and DSC analysis respectively. The electrolyte film with 30 wt% of SN was thermally stable up to 260°C. The ionic conductivities of polymer electrolyte films were calculated from the AC-impedance analysis. The undoped PEO 20 -LiTDI electrolyte exhibited the ionic conductivity of 9.64 9 10 -7 S cm -1 and this value was increased to 2.83 9 10 -5 S cm -1 when 30 wt% of succinonitrile was added to PEO 20 -LiTDI electrolyte at 23°C. The temperature dependent conductivity obeys Arrhenius behavior and the activation energy decreased to 0.264 eV. The electrochemical stability of the optimum conducting composition is 4.3 V, which make it attractive as electrolyte for Li battery.

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Liquid electrolytes based on new lithium conductive imidazole salts

Cited by 53 publications

References 25 publications

Determination of Transport Parameters in Liquid Binary Electrolytes: Part II. Transference Number

Determination of Transport Parameters in Liquid Binary Electrolytes: Part II. Transference Number

The curious effect of potassium fluoride on glycerol carbonate. How salts can influence the structuredness of organic solvents

New solid polymer electrolytes (PEO20–LiTDI–SN) for lithium batteries: structural, thermal and ionic conductivity studies

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