Suppression of aluminum current collector corrosion in ionic liquid containing electrolytes

Kühnel, Ruben‐Simon; Lübke, Mechthild; Winter, Martin; Passerini, Stefano; Balducci, Andrea

doi:10.1016/j.jpowsour.2012.04.054

Cited by 173 publications

(129 citation statements)

References 21 publications

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“…Besides, we did not see obvious aluminum corrosion phenomena of solid polymer lithium battery using CPPC-SPE after 100 cycle test ( Figure S12, Supporting Information). [ 67 ] Relying on obtained results, it can be assumed that CPPC-SPE could be a suitable electrolyte candidate that could afford a good cycling performance at a relatively high voltage (4.3 V vs Li + /Li). On the basis of that, this research will pave the way for designing and exploiting safety-reinforced, wider electrochemical window and ambient-temperature PPC-based solid polymer electrolyte for high-performance all-solid-state polymer lithium batteries.…”

Section: Rate Capability and Cycling Stability Of Lifepo 4 /Li Cell Amentioning

confidence: 85%

Safety‐Reinforced Poly(Propylene Carbonate)‐Based All‐Solid‐State Polymer Electrolyte for Ambient‐Temperature Solid Polymer Lithium Batteries

Zhang

Zhao

et al. 2015

Advanced Energy Materials

579

368

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An integrated preparation of safety‐reinforced poly(propylene carbonate)‐based all‐solid polymer electrolyte is shown to be applicable to ambient‐temperature solid polymer lithium batteries. In contrast to pristine poly(ethylene oxide) solid polymer electrolyte, this solid polymer electrolyte exhibits higher ionic conductivity, wider electrochemical window, better mechanical strength, and superior rate performance at 20 °C. Moreover, lithium iron phosphate/lithium cell using such solid polymer electrolyte can charge and discharge even at 120 °C. It is also noted that the solid‐state soft‐package lithium cells assembled with this solid polymer electrolyte can still power a red light‐emitting diode lamp without suffering from internal short‐circuit failures even after cutting off one part of the battery. Considering the aspects mentioned above, the solid polymer electrolyte is eligible for practical lithium battery applications with improved reliability and safety. Just as important, a new perspective that the degree of amorphous state of polymer is also as critical as its low glass transition temperature for the exploration of room temperature solid polymer electrolyte is illustrated. In all, this study opens up a kind of new avenue that could be a milestone to the development of high‐voltage and ambient‐temperature all‐solid‐state polymer electrolytes.

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Section: Rate Capability and Cycling Stability Of Lifepo 4 /Li Cell Amentioning

confidence: 85%

Safety‐Reinforced Poly(Propylene Carbonate)‐Based All‐Solid‐State Polymer Electrolyte for Ambient‐Temperature Solid Polymer Lithium Batteries

Zhang

Zhao

et al. 2015

Advanced Energy Materials

579

368

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“…In dilute electrolytes with considerable amount of free solvent molecules, the solid Al(TFSA) 3 complex should be easily dissolved through the coordination by the free solvents, as is demonstrated by Kühnel et al for dilute PC electrolytes. 98 The rapid dissolution of the Al(TFSA) 3 complex leads to severe oxidative corrosion of Al. On the contrary, in highly concentrated electrolytes without a free solvent molecule, the dissolution of Al(TFSA) 3 complex should be quite sluggish compared to that in dilute electrolytes, because all the solvent molecules are already in Li + -solvating states.…”

Section: 93mentioning

confidence: 99%

Review—Superconcentrated Electrolytes for Lithium Batteries

Yamada

2015

J. Electrochem. Soc.

698

667

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Ever-increasing demand for better batteries has set extraordinarily high standards for electrolyte materials, which are far beyond the realm of a conventional nonaqueous electrolyte design. Superconcentrated (or highly concentrated) solutions are emerging as a new class of liquid electrolytes with various unusual functionalities beneficial for advanced lithium (Li) battery applications. This article reviews unique features, as well as basic physicochemical properties, of highly concentrated electrolytes from the viewpoint of their peculiar solution structure, and discusses their future contributions to advanced battery technologies. © The Author(s) An electrolyte is an indispensable component in rechargeable batteries. In general, it serves as a carrier ion-conductive and electroninsulating medium facilitating ion transport between a pair of electrodes, simultaneously withstanding the strong reducing and oxidizing forces of negative and positive electrodes, respectively. From this perspective, an ion-transport property and reductive/oxidative stability are the major two metrics in a battery electrolyte design. For lithium (Li)-ion batteries, the reductive/oxidative stability is of particular importance, because they employ extremely strong reducer and oxidizer as negative and positive electrodes, respectively, to deliver the highest voltage (currently ca. 3.8 V) among various battery chemistries. To address this severe situation, an electrochemically stable nonaqueous electrolyte, rather than a highly conductive aqueous electrolyte, has been used with some compromise on ionic transport properties.The composition of nonaqueous electrolytes makes critical impacts on the performance of Li-ion batteries.1-3 This fact is seemingly paradoxical to the "rocking chair" concept of Li-ion batteries, in which electrolyte components principally do not participate in the battery faradaic reactions. This paradox arises, at least partly, from the inherent thermodynamic instability of the electrode/electrolyte interfaces; in most cases, the interfaces are stabilized in a kinetic way (by electrode passivation) based on electrolyte decomposition products, 4 and thus the nature of the interfaces strongly depends on electrolyte composition. In other words, the design of electrolytes often corresponds to the control of the interfaces where faradaic charge-transfer reactions occur, thus making significant effects on the battery performance.A nonaqueous electrolyte design seems to have infinite variations of aprotic solvents (and additives), Li salts, and their mixing ratios (i.e., electrolyte concentrations). Indeed, however, there are many restrictions in the choice of aprotic solvents and Li salts in terms of the kinetic stability of the interfaces they form. First, only specific organic carbonates (e.g., ethylene carbonate (EC)) are compatible with graphite negative electrodes. 5,6 This peculiarity results from solvent's passivation ability. Because almost all aprotic solvents are unstable at such a low potential as ∼0 V vs. Li +...

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“…44 To study the Al corrosion behavior in the diluted SILs, cyclic voltammetry was performed on the coin cell with Al foil as a working electrode and metallic Li-foil as counter and reference electrodes. Consequently, electrolyte components in diluted SILs greatly influenced the electrochemical stability and charge/discharge performance of the LiCoO 2 half-cells.…”

Section: 44mentioning

confidence: 99%

A Design Approach to Lithium-Ion Battery Electrolyte Based on Diluted Solvate Ionic Liquids

Ueno

Murai

Moon

et al. 2016

J. Electrochem. Soc.

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An equimolar mixture of lithium bis(trifluoromethylsulfonyl)amide (Li [TFSA]) and triglyme (G3) or tetraglyme (G4) yields the stable molten complexes, [Li(G3)] [TFSA] or [Li(G4)][TFSA], respectively, classified into solvate ionic liquids (SILs). The Li-conducting SIL electrolytes have favorable thermal and electrochemical properties, but their intrinsic high viscosities and low ionic conductivities impede widespread application. In this study, SILs were diluted with organic solvents, such as toluene, hydrofluoroether (HFE) and propylene carbonate (PC), to enhance their ionic conductivity. Subsequently, the performance of a battery consisting of diluted SILs, LiCoO 2 , and graphite electrodes was evaluated. The electrochemical stability and charge/discharge behavior of the LiCoO 2 cathode and graphite anode were greatly influenced by the stability of the complex cations, [Li(G3)] + or [Li(G4)] + , in the diluted SILs. Unfavorable ligand exchange between the glyme and PC occurred in PC-diluted SILs. Oxidative decomposition of the uncoordinated glyme and pitting corrosion of Al current collector deteriorated the battery performance of LiCoO 2 half-cell with PC-diluted SILs. We demonstrate that toluene-and HFE-diluted SILs, which do not contain chemicals such as carbonate solvent and LiPF 6 used in commercialized Li-ion batteries, allow both LiCoO 2 cathode and graphite anode to operate stably. Because of their high specific energy density, Li-based secondary batteries have been the most attractive candidates among a variety of energy storage systems. Research aimed at the development of Li-ion battery technologies has focused mainly on positive and negative electrode material, 1,2 while Li-conducting electrolytes have played a "supporting" role. Indeed, the major components of the electrolyte in commercialized Li-ion batteries, i.e., a mixture of polar ethylene carbonate (EC) and low-viscous linear carbonates such as diethyl carbonate (DEC) with ∼1 mol dm −3 of lithium hexafluorophosphate (LiPF 6 ), 3 have been in use since these batteries were first developed for practical application in 1991.The standard electrolyte (1 mol dm −3 LiPF 6 in EC/DEC) has been selected for the mature Li-ion battery technology, for several reasons, [3][4][5][6][7] and the battery reaction relies on each electrolyte component. The polar EC not only assists the supporting Li-salt to dissociate to a higher degree, but also forms a good solid electrolyte interphase (SEI) on the graphite anode. The SEI is formed via sacrificial initial decomposition and it allows reversible intercalation/deintercalation reactions of Li ions during charge/discharge. Less viscous linear carbonates such as DEC are mixed with the more viscous EC to improve the ionic conductivity of the electrolyte without compromising the high degree of salt dissociation and formation of the SEI. Despite its poor chemical stability, LiPF 6 is used as the supporting salt because of its high degree of dissociation. Moreover, LiPF 6 plays an important role in suppressing the corr...

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Suppression of aluminum current collector corrosion in ionic liquid containing electrolytes

Cited by 173 publications

References 21 publications

Safety‐Reinforced Poly(Propylene Carbonate)‐Based All‐Solid‐State Polymer Electrolyte for Ambient‐Temperature Solid Polymer Lithium Batteries

Safety‐Reinforced Poly(Propylene Carbonate)‐Based All‐Solid‐State Polymer Electrolyte for Ambient‐Temperature Solid Polymer Lithium Batteries

Review—Superconcentrated Electrolytes for Lithium Batteries

A Design Approach to Lithium-Ion Battery Electrolyte Based on Diluted Solvate Ionic Liquids

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