A novel phosphonium ionic liquid electrolyte enabling high-voltage and high-energy positive electrode materials in lithium-metal batteries

Wu, Fanglin; Schür, Annika Regitta; Kim, Guk‐Tae; Xu, Dong; Kuenzel, Matthias; Diemant, Thomas; D'Orsi, Gina; Simonetti, E.; Francesco, M. De; Bellusci, Mariangela; Appetecchi, Giovanni Battista; Passerini, Stefano

doi:10.1016/j.ensm.2021.08.030

Cited by 33 publications

(22 citation statements)

References 51 publications

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“…[73] Non-flammability is expected to solve the safety problem of the flammability of electrolytes in organic systems. [74] However, the properties of ionic liquids, such as viscosity, will slow down the diffusion behavior of metal ions in the electrolyte, resulting in poor compatibility with the interfaces. To solve the above problems, Sun et al [75] prepared an ionic liquid electrolyte with high conductivity at room temperature, and can form a stable SEI on the surface of the sodium metal electrode, of which exhibits excellent thermal stability, improving the battery performance significantly.…”

Section: Ionic Liquid Electrolytesmentioning

confidence: 99%

“…In addition, it is also called designer solvents because it is possible to selectively combine certain cations and certain anions to design and synthesize ionic liquids suitable for particular needs [73] . Non‐flammability is expected to solve the safety problem of the flammability of electrolytes in organic systems [74] . However, the properties of ionic liquids, such as viscosity, will slow down the diffusion behavior of metal ions in the electrolyte, resulting in poor compatibility with the interfaces.…”

Section: Electrolytesmentioning

confidence: 99%

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Electrolytes for Multivalent Metal‐Ion Batteries: Current Status and Future Prospect

et al. 2022

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Electrochemical energy storage has experienced unprecedented advancements in recent years and extensive discussions and reviews on the progress of multivalent metal-ion batteries have been made mainly from the aspect of electrode materials, but relatively little work comprehensively discusses and provides an outlook on the development of electrolytes in these systems. Under this circumstance, this Review will initially introduce different types of electrolytes in current multivalent metal-ion batteries and explain the basic ion conduction mechanisms, preparation methods, and pros and cons. On this basis, we will discuss in detail the research and development of electrolytes for multivalent metal-ion batteries in recent years, and finally, critical challenges and prospects for the application of electrolytes in multivalent metal-ion batteries will be put forward.

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Section: Ionic Liquid Electrolytesmentioning

confidence: 99%

Section: Electrolytesmentioning

confidence: 99%

Electrolytes for Multivalent Metal‐Ion Batteries: Current Status and Future Prospect

et al. 2022

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“…These are closely related to ammonium-based ILs, which, in contrast to phosphonium ILs, contain nitrogen as a center in the cation and have already been studied more extensively [ 7 , 8 ]. However, it has been shown that alkyl-substituted, as well as alkoxy-substituted phosphonium ILs, have promising physical properties [ 9 ], electrochemical properties [ 9 , 10 , 11 ], good oxidative stability [ 12 ] as well as favorable behavior in Li plating–stripping experiments related to ammonium ILs (higher Coloumbic efficiency) [ 13 ] for use in energy storage devices and are therefore currently being studied in detail [ 5 ]. Likewise, conducting salts can already be dissolved at concentrations ≥ 0.75 M, such as lithium bis(trifluoromethanesulfonyl) imide ([Li][TFSI]) [ 9 , 12 ] and lithium bis(fluorosulfonyl) imide ([Li][FSI]) [ 14 ].…”

Section: Introductionmentioning

confidence: 99%

Novel Phosphonium-Based Ionic Liquid Electrolytes for Battery Applications

et al. 2022

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In this study, we address the fundamental question of the physicochemical and electrochemical properties of phosphonium-based ionic liquids containing the counter-ions bis(trifluoromethanesulfonyl)imide ([TFSI]−) and bis(fluorosulfonyl)imide ([FSI]−). To clarify these structure–property as well as structure–activity relationships, trimethyl-based alkyl- and ether-containing phosphonium ILs were systematically synthesized, and their properties, namely density, flow characteristics, alkali metal compatibility, oxidative stability, aluminum corrosivity as well as their use in Li-ion cells were examined comprehensively. The variable moiety on the phosphonium cation exhibited a chain length of four and five, respectively. The properties were discussed as a function of the side chain, counter-ion and salt addition ([Li][TFSI] or [Li][FSI]). High stability coupled with good flow characteristics were found for the phosphonium IL [P1114][TFSI] and the mixture [P1114][TFSI] + [Li][TFSI], respectively.

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“…Among the large variety of available ILs, the most investigated ones for lithium-ion battery (LIB) applications are those based on quaternary ammonium, pyrrolidinium, and imidazolium cations. ,,− Nevertheless, in recent years, ILs containing the phosphonium cation were successfully introduced as well. − In particular, recent studies on phosphonium cations with small alkyl chains, trimethyl(isobutyl)phosphonium (P 111i4 ), combined with the FSI anion, have shown remarkable stability with Li metal. ,, The outstanding cycling efficiency and cycling performance of the electrolyte on the Li metal were attributed to the formation of a stable SEI at the Li metal electrode . The formed SEI exhibited a layered structure with significant quantities of chemical species associated with the FSI anion reduction, such as lithium fluoride (LiF), lithium oxide (Li 2 O), and lithium sulfide (Li 2 S, LiSO 2 , and Li 2 NSO 2 F), whereas no evidence of P 111i4 cation reduction was found …”

Section: Introductionmentioning

confidence: 99%

Investigation of a Fluorine-Free Phosphonium-Based Ionic Liquid Electrolyte and Its Compatibility with Lithium Metal

Karimi

Zarrabeitia

Hosseini

et al. 2022

ACS Appl. Mater. Interfaces

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A novel fluorine-free ionic liquid electrolyte comprising lithium dicyanamide (LiDCA) and trimethyl(isobutyl)phosphonium tricyanomethanide (P 111i4 TCM) in a 1:9 molar ratio is studied as an electrolyte for lithium metal batteries. At room temperature, it demonstrates high ionic conductivity and viscosity of about 4.5 mS cm −1 and 64.9 mPa s, respectively, as well as a 4 V electrochemical stability window (ESW). Li stripping/ plating tests prove the excellent electrolyte compatibility with Li metal, evidenced by the remarkable cycling stability over 800 cycles. The evolution of the Li−electrolyte interface upon cycling was investigated via electrochemical impedance spectroscopy, displaying a relatively low impedance increase after the initial formation cycles. Finally, the solid electrolyte interphase (SEI) formed on Li metal appeared to have a bilayer structure mostly consisting of DCA and TCM reduction products. Additionally, decomposition products of the phosphonium cation were also detected, despite prior studies reporting its stability against Li metal.

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A novel phosphonium ionic liquid electrolyte enabling high-voltage and high-energy positive electrode materials in lithium-metal batteries

Cited by 33 publications

References 51 publications

Electrolytes for Multivalent Metal‐Ion Batteries: Current Status and Future Prospect

Electrolytes for Multivalent Metal‐Ion Batteries: Current Status and Future Prospect

Novel Phosphonium-Based Ionic Liquid Electrolytes for Battery Applications

Investigation of a Fluorine-Free Phosphonium-Based Ionic Liquid Electrolyte and Its Compatibility with Lithium Metal

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