Lithium fluoroalkylphosphates: a new class of conducting salts for electrolytes for high energy lithium-ion batteries

Schmidt, Michael A.; Heider, U.; Kuehner, A.V.; Oesten, R.; Jungnitz, M.; Ignat’ev, Nikolai; Sartori, Peter

doi:10.1016/s0378-7753(01)00640-1

Cited by 196 publications

(101 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…According to reports in the literature, the onset temperature for the decomposition of dry, + [20] o [59] + [61] + [62] + [63] electrochemicalstability + [23,64,98] o [60] o [52] + [23,65] + [23] + [33] thermal stability À [43,[66][67][68][69] o [70] o [71] + [72] À [62] + [42,43] stability towardsm oisture À [38,39,[73][74][75] o [60] o [71] o [65] o [76] + [77] Al current collectorp assivation + [36,44,47] ++ [71,78] + [79] o [62] À [46][47][48][49]80] nontoxicity solid LiPF 6 is about 100 8C. [43,[66]…”

Section: Lithiumhexafluorophosphate (Lipf 6 )mentioning

confidence: 99%

Safer Electrolytes for Lithium‐Ion Batteries: State of the Art and Perspectives

et al. 2015

View full text Add to dashboard Cite

Lithium-ion batteries are becoming increasingly important for electrifying the modern transportation system and, thus, hold the promise to enable sustainable mobility in the future. However, their large-scale application is hindered by severe safety concerns when the cells are exposed to mechanical, thermal, or electrical abuse conditions. These safety issues are intrinsically related to their superior energy density, combined with the (present) utilization of highly volatile and flammable organic-solvent-based electrolytes. Herein, state-of-the-art electrolyte systems and potential alternatives are briefly surveyed, with a particular focus on their (inherent) safety characteristics. The challenges, which so far prevent the widespread replacement of organic carbonate-based electrolytes with LiPF6 as the conducting salt, are also reviewed herein. Starting from rather "facile" electrolyte modifications by (partially) replacing the organic solvent or lithium salt and/or the addition of functional electrolyte additives, conceptually new electrolyte systems, including ionic liquids, solvent-free, and/or gelled polymer-based electrolytes, as well as solid-state electrolytes, are also considered. Indeed, the opportunities for designing new electrolytes appear to be almost infinite, which certainly complicates strict classification of such systems and a fundamental understanding of their properties. Nevertheless, these innumerable opportunities also provide a great chance of developing highly functionalized, new electrolyte systems, which may overcome the afore-mentioned safety concerns, while also offering enhanced mechanical, thermal, physicochemical, and electrochemical performance.

show abstract

Section: Lithiumhexafluorophosphate (Lipf 6 )mentioning

confidence: 99%

Safer Electrolytes for Lithium‐Ion Batteries: State of the Art and Perspectives

et al. 2015

View full text Add to dashboard Cite

show abstract

“…Tri(pentafluoroethyl)trifluorophosphate is far more stable in aqueous environments, but still undergoes gradual decomposition. 221 Special care must be exercised when acquiring reliable data for ILs composed of these anions. 222 Recent physicochemical data reported in literature are mainly on ILs that are stable in aqueous media, such as those based on bis(trifluoromethylsulfonyl)imide.…”

Section: Mutual Solubility Of Ionic Liquid and Watermentioning

confidence: 99%

Mutual Solubility of Hydrophobic Ionic Liquids and Water in Liquid-Liquid Two-phase Systems for Analytical Chemistry

Kakiuchi

2008

ANAL. SCI.

View full text Add to dashboard Cite

Liquid-liquid two-phase systems formed by a hydrophobic ionic liquid and water find several useful ways of application in analytical chemistry. One of the most important properties of such two-phase systems is the mutual solubility of the IL and water. Recent advancements on this subject have been reviewed. The solubility of ionic liquids in water is related to the standard Gibbs energies of the transfer of ions constituting the ionic liquid from the ionic liquid phase to water. Although this single ionic property cannot be measured thermodynamically and also varies from one ionic liquid to another, the standard Gibbs energy of the ion transfer from a polar aprotic solvent, such as nitrobenzene and 1,2-dichloroethane, to water is a convenient measure for it. The solubility of an ionic liquid in water and the electrochemical properties at the interface between the two phases are intimately related with each other.

show abstract

“…where ρ s is the resistivity of the soaked separator and ρ e the resistivity of the electrolyte after Schmidt et al 30 EIS measurements with blocking electrodes were also exploited to evaluate the shutdown properties of the EPS during an abnormal temperature rise. The cell was placed in a Memmert UNB 100 oven and the temperature raised from 30…”

Section: A6432mentioning

confidence: 99%

Polyvinylidene Difluoride–Polyethyleneoxide Blends for Electrospun Separators in Li-Ion Batteries

Monaca

Giorgio

Focarete

et al. 2017

J. Electrochem. Soc.

View full text Add to dashboard Cite

Polyvinylidenedifluoride (PVdF) and polyethyleneoxide (PEO) are blended and electrospun in order to obtain membranes suitable as Li-ion battery separators. The separators are characterized, and their properties investigated and compared with those of PVdF and commercial separators. The PVdF-PEO based separators ensure increased conductivities, greater electrolyte uptake and higher porosities than commercial polyolefines, all factors that improve cell performance. Li-ion batteries are one of the most mature and most wide spread energy storage systems on the market. They supply almost every laptop, smartphone and tablet and are among the most widely used storage systems in hybrid and electric vehicles. Today Li-ion technology is approaching its limits of energy density (200-250 Wh/kg) 1,2 thanks to new and advanced high-voltage and high-capacity electrode materials. Hence, most electrochemical research seeks to improve cycle life and safety.2-9 However, in order to meet the new conditions required by high voltage electrodes and to enhance the other aforementioned features, the development of so-called inactive materials is mandatory. A key inactive material is the separator. It prevents physical and electrical contact between electrodes while allowing ions to flow through it. It must have a high chemical and electrochemical stability vis-á-vis the electrode and electrolyte materials and should be mechanically strong enough to withstand the high stress during battery assembly. The separator must also be sufficiently porous to absorb a large quantity of liquid electrolyte, thus assuring high ionic conductivity. On the other hand, the separator inevitably increases the electrical resistance of the cell, thereby significantly worsening the battery performance. Indeed, it must be very thin and porous in order to achieve high energy and power densities while ensuring sufficient mechanical robustness. 10-13The perfect separator has yet to be invented, its development depending on trade-offs among the aforementioned properties in order to obtain the specific features for the desired application. Safety too is an important concern. A necessary feature of separators is the shutdown function, i.e. the ability to shut the battery down when overheating occurs due, for example, to a short circuit, overcharging or exposure to external heat sources, in order to prevent thermal runaway.14,15 Nearly all separators today used in liquid electrolyte batteries are based on microporous polyolefin membranes given their good mechanical properties, thinness and low cost. Much research effort of late has been devoted to the development of innovative, highly porous separators based on non-woven mats. One well known method of mat preparation is electrospinning technology. 13,16,17 Electrospinning is a low cost technology with respect to other techniques used to manufacture nanofibers, e.g. extrusion, drawing, phase separation. It is also commonly used to fabricate highly porous nanostructures or nanofibrous non-woven membranes characterized b...

show abstract

Lithium fluoroalkylphosphates: a new class of conducting salts for electrolytes for high energy lithium-ion batteries

Cited by 196 publications

References 7 publications

Safer Electrolytes for Lithium‐Ion Batteries: State of the Art and Perspectives

Safer Electrolytes for Lithium‐Ion Batteries: State of the Art and Perspectives

Mutual Solubility of Hydrophobic Ionic Liquids and Water in Liquid-Liquid Two-phase Systems for Analytical Chemistry

Polyvinylidene Difluoride–Polyethyleneoxide Blends for Electrospun Separators in Li-Ion Batteries

Contact Info

Product

Resources

About