New insight in the electrochemical behaviour of stainless steel electrode in water-in-salt electrolyte

Coustan, Laura; Zaghib, Karim; Bélanger, Daniel

doi:10.1016/j.jpowsour.2018.07.114

Cited by 45 publications

(37 citation statements)

References 16 publications

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“…23 The presence of those new environments at higher wavenumbers traduces the reinforcement of the O-H bond which could therefore explain the lowest reactivity of the water upon electrolysis conditions observed in WiSEs. 10,24,25 Nevertheless, this result is counter intuitive as first since, owing to the strong Lewis acidity of Li + cation, a depletion of the electronic density of water and therefore a weakening of the O-H bond of water molecules would have been expected. Hence, to discriminate the relative influences of the cations and anions, similar analysis were performed on saturated To explore further the role of the different ions on the solvation of water molecules and their electronic environement, 1 H, 7 Li and 19 F nuclear magnetic resonance (NMR) spectroscopy was used.…”

Section: Water-in-salt Electrolytes Vs Saturated Electrolytes: Modifmentioning

confidence: 99%

The role of the hydrogen evolution reaction in the solid–electrolyte interphase formation mechanism for “Water-in-Salt” electrolytes

Dubouis

Lemaire

Mirvaux

et al. 2018

Energy Environ. Sci.

273

346

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Section: Water-in-salt Electrolytes Vs Saturated Electrolytes: Modifmentioning

confidence: 99%

The role of the hydrogen evolution reaction in the solid–electrolyte interphase formation mechanism for “Water-in-Salt” electrolytes

Dubouis

Lemaire

Mirvaux

et al. 2018

Energy Environ. Sci.

273

346

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“…Besides, the ESW widening was previously assessed using metallic current collectors such as platinum, conductive glassy carbon, or directly with current collector materials (titanium, stainless steel, or aluminum) with overpotential greater than 500 mV measured for the OER [4,5,28,[32][33][34] using superconcentrated electrolytes. Instead, almost no change is observed for the HER overpotential as a function of the metallic current collector [32,33] when increasing the salt concentration, the exception being aluminum that passivates. [4,29,[34][35][36] However, we must exercise caution in hastily interpreting these potential shifts that are determined by cyclic voltammetry (CV) measurements rather than by potentio/galvanostatic methods, hence departing from practical conditions.…”

mentioning

confidence: 99%

Water‐in‐Salt Electrolyte (WiSE) for Aqueous Batteries: A Long Way to Practicality

Droguet

Grimaud

Fontaine

et al. 2020

Advanced Energy Materials

167

164

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Li-ion batteries, because of their outstanding performances, have become an integral part of our society. However, a remaining challenge regards ways to lower their cost and improve their sustainability. Toward that ambitious goal, several strategies are currently being explored, one being the use of aqueous electrolytes that are theoretically cheaper, safer, and less toxic than their organic counterparts. However, the major limitation in the development of aqueous electrolytes is the narrow thermodynamic electrochemical stability window (ESW) of water (1.23 V). Although it can be kinetically extended to 1.5 V when using salts in a diluted solution, such aqueous systems still do not compete against organic ones. Owing to this limitation that translates into poor energy density, Li-aqueous systems, as introduced in 1994 by Dahn and coworkers, could never be marketed. [1] To alleviate this issue, in continuation of early works dedicated to the development of superconcentrated organic electrolytes, [2] Suo et al. [3] proposed in 2015, an aqueous electrolyte made with a salt concentration of 21 mol kg −1 (21 m), denoted water-in-salt electrolytes (WiSE). Through this trick, the authors could enlarge the operating potential window of aqueous systems to 3 V while preserving an ionic conductivity alike that of classical organic electrolytes (≈10 mS cm −1). As a proof of concept, a 2.3 V battery using Mo 6 S 8 and LiMn 2 O 4 as negative and positive electrodes, respectively, was reported. Following this demonstration, Yamada et al. [4] then showed that mixing two organic lithium salts, thus forming a so-called water-in-bisalt electrolyte (WiBS), enables assembling aqueous batteries with a working potential as high as 3.1 V using Li 4 Ti 5 O 12 and LiNi 0.5 Mn 1.5 O 4 electrodes. Altogether, these studies have renewed interest for revisiting aqueous systems relying on the use of superconcentrated electrolytes, hence the recent reports on aqueous Na-ion, [5-9] K-ion, [10-13] Li-O 2 [14] or even quasi-solid-state batteries based on, e.g., polymer hydrogel electrolytes. [15-19] Different types of superconcentrated aqueous electrolytes are currently investigated for Li-aqueous systems. Most frequently used is the water-in-salt electrolyte based on one lithium salt, [3,20,21] usually LiTFSI or TFSI-derived salts which have the specificity to form F-based solid electrolyte interphase (SEI) at The sustainability of battery components is becoming a key parameter for storing renewable energy at large scale. Toward that goal, several strategies are currently being explored. Great hopes are placed in the use of superconcentrated aqueous electrolytes, which enlarge the electrochemical stability window well beyond 1.2 V. Although fundamentally elegant, the practicability of such an approach remains unknown. Therefore, an indepth analysis of the stability and cycling behavior of water-in-salt (WiSE) and water-in-bisalt (WiBS) electrolytes as a function of concentration and temperature is carried out by monitoring via combined operando ...

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“…It is also believed that the formation of a solid electrolyte interphase (SEI) layer with a high salt concentration on the electrode surface can prevent water reduction, thus positively contributing to the wide electrochemical stability window. To be specific, the OH − generated during the hydrogen oxygen reaction in the first cycle will chemically react with anions (such as TFSI) to mainly form a stable SEI film, which further prevents water reduction, and enhances the oxidative stability of the electrode masteries (Coustan et al, 2018 ; Dubouis et al, 2018 ). A typical solvation structure for WIS electrolytes is schematically depicted in Scheme 1 .…”

Section: The Operating Mechanism Of “Wis” Electrolytes In Extending Tmentioning

confidence: 99%

Recent Progress in “Water-in-Salt” Electrolytes Toward Non-lithium Based Rechargeable Batteries

et al. 2020

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Aqueous non-lithium based rechargeable batteries are emerging as promising energy storage devices thanks to their attractive rate capacities, long-cycle life, high safety, low cost, environmental-friendliness, and easy assembly conditions. However, the aqueous electrolytes with high ionic conductivity are always restricted by their intrinsically narrow electrochemical window. Encouragingly, the highly concentrated "water-in-salt" (WIS) electrolytes can efficiently expand the stable operation window, which brings up a series of aqueous high-voltage rechargeable batteries. In the mini review, we summarize the latest progress and contributions of various aqueous electrolytes for non-lithium (Na + , K + , Zn 2+ , Mg 2+ , and Al 3+) based rechargeable batteries, and give a brief exploration of the operating mechanisms of WIS electrolytes in expanding electrochemically stable windows. Challenges and prospects are also proposed for WIS electrolytes toward aqueous non-lithium rechargeable metal ion batteries.

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New insight in the electrochemical behaviour of stainless steel electrode in water-in-salt electrolyte

Cited by 45 publications

References 16 publications

The role of the hydrogen evolution reaction in the solid–electrolyte interphase formation mechanism for “Water-in-Salt” electrolytes

The role of the hydrogen evolution reaction in the solid–electrolyte interphase formation mechanism for “Water-in-Salt” electrolytes

Water‐in‐Salt Electrolyte (WiSE) for Aqueous Batteries: A Long Way to Practicality

Recent Progress in “Water-in-Salt” Electrolytes Toward Non-lithium Based Rechargeable Batteries

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