Fast Charge/Discharge of Li Metal Batteries Using an Ionic Liquid Electrolyte

Yoon, Hyung‐Suk; Howlett, Patrick C.; Best, Adam S.; Forsyth, Maria; MacFarlane, Douglas R.

doi:10.1149/2.022310jes

Cited by 223 publications

(259 citation statements)

References 46 publications

(71 reference statements)

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“…[110][111][112][113] At this stage, however, there is no certain information available for understanding how the LiFSA salt affects the interfacial Li + transfer process. One of the most likely factors is the unique Li salt-based SEI film formed in highly concentrated electrolytes as discussed in the prior section, which is totally different from an EC solvent-based SEI film in commercial EC-based electrolytes.…”

Section: Electrode Reaction Kineticsmentioning

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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Section: Electrode Reaction Kineticsmentioning

confidence: 99%

Review—Superconcentrated Electrolytes for Lithium Batteries

Yamada

2015

J. Electrochem. Soc.

698

667

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“…The proportion of 40 wt% ionic liquid was chosen as a compromise between improved safety and low viscosity for these electrolytes at room temperatures. 20,34,37 The most commonly studied ionic liquids in lithium batteries 20,33,38,39 [FSI] were used in hybrid combinations with the conventional electrolyte mixture. Electrochemical tafel studies were carried out to understand the corrosion kinetics in these hybrid electrolytes.…”

Section: Introductionmentioning

confidence: 99%

Passivation behaviour of aluminium current collector in ionic liquid alkyl carbonate (hybrid) electrolytes

et al. 2018

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The compatibility of current collectors with the electrolyte plays a major role in the overall performance of lithium batteries, critical to obtain high storage capacity as well as excellent capacity retention. In lithium-ion batteries, in particular with cathodes that operate at high voltage such as lithium nickel cobalt manganese oxide, the cathodic current collector is aluminium and it is subjected to high oxidation potentials (>4 V vs. Li/Li + ). As a result, the composition of the electrolyte needs to be carefully designed in order to stabilise the battery performance as well as to protect the current collectors against corrosion. This study examines the role of a hybrid electrolyte composed of an ionic liquid (N-methyl-N-propyl pyrrolidinium bis(trifluoromethanesulfonyl)imide or Nmethyl-N-propyl pyrrolidinium bis(fluorosulfonyl)imide) and a conventional electrolyte mixture (LiPF 6 salt and alkyl carbonate solvents) with correlation to their electrochemical behaviour and corrosion inhibition efficiency. The hybrid electrolyte was tested against battery grade aluminium current collectors electrochemically in a three-electrode cell configuration and the treated aluminium surface was characterised by SEM/EDXS, optical profilometry, FTIR, and XPS analysis. Based on the experimental results, the hybrid electrolytes allow an effective and improved passivation of aluminium and lower the extent of aluminium dissolution in comparison with the conventional lithium battery electrolytes and the neat ionic liquids at high anodic potentials (4.7 V vs. Li/Li + ). The mechanism of passivation behaviour is also further investigated. These observations provide a potential direction for developing improved hybrid electrolytes, based on ionic liquids, for higher energy density devices.npj Materials Degradation (2018) 2:13 ;

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“…These attractive properties are being widely exploited in high-energy electrochemical devices such as lithium-based batteries [1]. Reversible plating/stripping of Li has been reported for various ionic liquids [3][4][5]. In addition, cycling of different electroactive materials has recently been presented [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Catalytic reduction of TFSI-containing ionic liquid in the presence of lithium cations

Tułodziecki

Tarascon

Taberna

et al. 2017

Electrochemistry Communications

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OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. a b s t r a c tThe influence of the electrochemical double layer (EDL) structure on the electrochemical processes in ionic liquids is an intriguing subject. The complex layered structure of the EDL and its restructuring have been shown to strongly affect metal deposit morphology and electrochemical reaction kinetics. In this work, we demonstrate that the breakdown of an ionic liquid containing TFSI anions can be catalyzed through the addition of Li + cations.We ascribe this catalytic effect to the change in the EDL structure: the Li + cations preferentially adsorb on the electrode surface and drag the TFSI anions with them, facilitating their reduction. The decomposition of the ionic liquid leads to the formation of an SEI layer, which is studied using an electrochemical quartz crystal microbalance.

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Fast Charge/Discharge of Li Metal Batteries Using an Ionic Liquid Electrolyte

Cited by 223 publications

References 46 publications

Review—Superconcentrated Electrolytes for Lithium Batteries

Review—Superconcentrated Electrolytes for Lithium Batteries

Passivation behaviour of aluminium current collector in ionic liquid alkyl carbonate (hybrid) electrolytes

Catalytic reduction of TFSI-containing ionic liquid in the presence of lithium cations

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