Mixed organic compound-ionic liquid electrolytes for lithium battery electrolyte systems

Montanino, Maria; Moreno, Margherita; Carewska, Maria; Maresca, Giovanna; Simonetti, E.; Presti, Roberto Lo; Alessandrini, F.; Appetecchi, Giovanni Battista

doi:10.1016/j.jpowsour.2014.07.027

Cited by 67 publications

(39 citation statements)

References 21 publications

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“…33,34 RTILs can be engineered by changing their structure, thus tailoring their properties, in order to contemporarily meet various important needs such as high ionic conductivity, interfacial and electrochemical stabilities as well as thermal stability and low-flammability. 35,36 These features allow the realization of safer electrochemical storage devices such as supercapacitors, [37][38][39] batteries [40][41][42][43][44][45][46][47][48][49][50][51][52][53] and solar cells. 54 Herein, mixtures of N-butyl-N-methylpyrrolidinium bis(trifluoromethanesulfonyl)imide (Pyr 14 TFSI), N-butyl-N-methylpyrrolidinium bis(fluorosulfonyl)imide (Pyr 14 FSI), N-methoxy-ethyl-N-methylpyrrolidinium bis(trifluoromethanesulfonyl)imide (Pyr 12O1 TFSI) or N-N-diethyl-N-methyl-N-(2-methoxyethyl)ammonium bis(trifluoromethanesulfonyl)imide (DEMETFSI) [55][56][57][58] ionic liquids with lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) salt are comparatively evaluated for application as electrolytes in Li-ion batteries (see structural details in Fig.…”

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confidence: 99%

Exceptional long-life performance of lithium-ion batteries using ionic liquid-based electrolytes

Elia

Ulissi

Jeong

et al. 2016

Energy Environ. Sci.

150

128

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Broader contextThis new lithium ion battery is composed of a N-butyl-N-methylpyrrolidinium bis(fluoro-sulfonyl)imide (Pyr 14 FSI) lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) IL-electrolyte, Sn-C nanocomposite Li-alloying anode and LiFePO 4 olivine cathode. The non-volatile, poorly-flammable electrolyte is advantageously selected based on a comparative study of various ILs differing by the chemical structure, while the anode and cathode are considered very promising electrodes in terms of cycle life, interface stability, energy content and rate capability. The battery delivers a reversible capacity of about 160 mA h g À1 at a working voltage of about 3 V, and an estimated practical energy of about 160 W h kg À1 for over 2000 cycles. Such outstanding cycle life, high efficiency and rate capability as well as the expected low environmental impact and high safety content suggest the application of the studied battery in new-generation electric and electronic devices.

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confidence: 99%

Exceptional long-life performance of lithium-ion batteries using ionic liquid-based electrolytes

Elia

Ulissi

Jeong

et al. 2016

Energy Environ. Sci.

150

128

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“…8 Lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) was chosen as the salt because of its high solubility (even in suitable polymer hosts), 6 good ion transport properties and wide electrochemical stability. 9 Also, the addition of proper additives (ethylene carbonate, EC) in small amount, aiming to improve the interface with z E-mail: gianni.appetecchi@enea.it graphite anodes, was considered (small alkyl carbonates contents were seen to not deplete the electrolyte safety, 10 i.e., the organic additive is mainly consumed during the first cycle in battery).…”

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confidence: 99%

Highly Conductive, Ionic Liquid-Based Polymer Electrolytes

Simonetti

Carewska

Maresca

et al. 2016

J. Electrochem. Soc.

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In this manuscript is reported a thermal and impedance spectroscopy investigation carried out on quaternary polymer electrolytes, to be addressed as separators for lithium solid polymer batteries, containing large amount of the N-methyl-N-propylpyrrolidinium bis(fluorosulfonyl)imide ionic liquid. The target is the development of Li + conducting membranes with enhanced ion transport even below room temperature. Polyethylene oxide and polymethyl methacrylate were selected as the polymeric hosts. A fully dry, solvent-free procedure was followed for the preparation of the polymer electrolytes, which were seen to be self-consistent and handled even upon prolonged storage periods (more than 1 year). Appealing ionic conductivities were observed especially for the PEO electrolytes, i.e., 1.6 × 10 −3 and 1.5 × 10 −4 S cm −1 were reached at 20 and −20 • C, respectively, which are ones the best, if not the best ion conduction, never detected for polymer electrolytes. Lithium polymer batteries (LPBs) are considered excellent candidates for the next generation power sources because they combine high energy density and flexible characteristics with the safety issue of the solvent-free electrolytes.1 Nevertheless, the performance of LPBs is limited by the low ionic conductivity of the solvent-free polymer electrolytes at room temperature as the polymeric host is manly crystalline (i.e., resulting in slow motion of the Li + active specie). 2For instance, polyethylene oxide-(PEO) based electrolytes exhibit suitable conduction values (≥10 −4 S cm −1 ) for practical applications only above 65• C, e.g., where the amorphous phase is predominant and allows remarkably higher mobility to the lithium ions.3-5 Therefore, several approaches 6 were attempted aiming to decrease the content of crystalline phase (particularly, P(EO) 6 LiX) 3-5 in polymer electrolytes, e.g., branched and/or cross-linked hosts, blended polymer matrices, large counter anion lithium salts, addition of additives (organic compounds, oligomers, ceramic fillers).One of the most promising approaches is represented by the incorporation of ionic liquids (ILs) into the polymer electrolytes. 6 In the last years it was successfully demonstrated 6 that incorporation of N-alkyl-N-methylpyrrolidinium (PYR 1A , where the subscripts indicate the number of carbon atoms of the pyrrolidinium cation alkyl chains) perfluorosulfonylimide (PFSI) ILs enhances the room temperature ionic conductivity of solid polymer electrolytes (SPEs) above 10 −4 Scm −1 and improves the compatibility with respect to the lithium anode.However, faster ion transport properties are needed, especially in devices (operating at high current rates) for applications (i.e., automotive) requiring higher power density values. In the frame of the MARS-EV project 7 we have properly designed and developed SPEs based on PEO and polymethyl methacrylate (PMMA), i.e., considered ones of the most suitable materials as host for polymer electrolytes, 6 and incorporating large fraction of N-methyl-N-propylpyrrolidinium bis(f...

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“…Similar behavior was exhibited for PYR 14 TFSI, as well as AMImTFSI using graphite and lithium manganese nickel cobalt oxide (LMNC) as the anode and cathode, respectively [43,52,84,85]. With the intention of enhancing the safety and performance of LIBs at elevated temperatures, the properties of hybrid organic electrolytes (i.e., ILs in organic carbonates), such as their flammability and volatility, can be measured and repressed through the careful modification of organic solvent content [35,86,87]. The hybrid organic electrolytes containing PYR 13 TFSI:LiTFSI:(EC/diethyl carbonate (DEC) 1:1 mol%) (60:10:30 mol%) were performed as a non-flammable electrolyte at ambient temperature and showed a similar performance to marketable liquid electrolytes in both Li/Li 4 Ti 5 O 12 (lithium titanate (LTO)) and Li/LiFePO 4 (LFP) half-cells [35].…”

Section: Organic Carbonates and Ionic Liquid-based Binary Liquid Elecmentioning

confidence: 72%

“…The hybrid organic electrolytes containing PYR 13 TFSI:LiTFSI:(EC/diethyl carbonate (DEC) 1:1 mol%) (60:10:30 mol%) were performed as a non-flammable electrolyte at ambient temperature and showed a similar performance to marketable liquid electrolytes in both Li/Li 4 Ti 5 O 12 (lithium titanate (LTO)) and Li/LiFePO 4 (LFP) half-cells [35]. An analogous type of 0.3 M LiTFSI in PYR 13 TFSI: vinylene carbonate (VC):(EC/DMC 1:1 wt%) (65:5:30 vol%) electrolyte delivered the highest discharge capacity of 150 mA h g −1 at 1 C rate for a Li/LiFePO 4 half-cell, at 75 • C [86]. Some important electrochemical and cycling properties of the electrolytes containing both ILs and carbonate solvents are charted in Table 1.…”

Section: Organic Carbonates and Ionic Liquid-based Binary Liquid Elecmentioning

confidence: 99%

“…Some important electrochemical and cycling properties of the electrolytes containing both ILs and carbonate solvents are charted in Table 1. [86] Recently, Khalid et al [88] developed a new category of hybrid IL/organic electrolyte for a high-temperature application using 1-methyl-1-propylpiperidinium bis(trifluoromethanesulfonyl)-imide (Pip 12 TFSI)-based liquid electrolytes.…”

Section: Organic Carbonates and Ionic Liquid-based Binary Liquid Elecmentioning

confidence: 99%

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Ionic Liquid-Based Electrolytes for Energy Storage Devices: A Brief Review on Their Limits and Applications

et al. 2020

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Since the ability of ionic liquid (IL) was demonstrated to act as a solvent or an electrolyte, IL-based electrolytes have been widely used as a potential candidate for renewable energy storage devices, like lithium ion batteries (LIBs) and supercapacitors (SCs). In this review, we aimed to present the state-of-the-art of IL-based electrolytes electrochemical, cycling, and physicochemical properties, which are crucial for LIBs and SCs. ILs can also be regarded as designer solvents to replace the more flammable organic carbonates and improve the green credentials and performance of energy storage devices, especially LIBs and SCs. This review affords an outline of the progress of ILs in energy-related applications and provides essential ideas on the emerging challenges and openings that may motivate the scientific communities to move towards IL-based energy devices. Finally, the challenges in design of the new type of ILs structures for energy and environmental applications are also highlighted.Polymers 2020, 12, 918 2 of 37 and structural stability of the ionic species are extremely crucial and responsible for the efficient outputs in energy storage devices. In the light of this fact, high current (i.e., automotive applications) operating devices are required to have storage devices that have higher power density and faster ion transport properties. Previous studies have suggested that one of the most favorable approaches to simultaneously progress the safety, along with energy and power densities, is the incorporation of ILs into the electrolyte system [11].In past decades, room temperature ionic liquids (RTILs) have been acknowledged with noteworthy attention due to their excellent miscellaneous properties, such as thermal and chemical stability, tunable structure over the wide range of operating temperature, a broad electrochemical stability window, high ionic conductivity in the range of 10 −3 -10 −2 S cm −1 at room temperature, and non-flammability as a potential candidate for EES devices, such as LIBs [12], electric double-layer SCs [13][14][15], proton exchange membrane fuel cells, and solar cells [16][17][18][19]. Using ILs as an alternative to organic electrolytes has the advantage of improving the ions' mobility, as well as eliminating the hazards associated within the organic electrolytes. Additionally, ILs often have comparable zero or negligible vapor pressure at normal temperatures due to their high thermal stability. Because of the above statements, ILs are widely used as solvents or electrolytes for energy storage applications in recent times [7,18,[20][21][22][23][24][25][26][27].Typically, ILs are organic salts, also defined as molten salts, which have a lower melting point (<100 • C) with a wide degree of variation. Moreover, they are comprised of organic cations, such as an pyridinium (PY) [28], imidazolium (Im) [29][30][31][32], pyrrolidinium (PYR) [33][34][35][36], ammonium [37], and sulfonium [38], derivatives joined inorganic or organic anions, such as BF 4 − [39,40], PF 6 − [30], triflate (...

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Mixed organic compound-ionic liquid electrolytes for lithium battery electrolyte systems

Cited by 67 publications

References 21 publications

Exceptional long-life performance of lithium-ion batteries using ionic liquid-based electrolytes

Exceptional long-life performance of lithium-ion batteries using ionic liquid-based electrolytes

Highly Conductive, Ionic Liquid-Based Polymer Electrolytes

Ionic Liquid-Based Electrolytes for Energy Storage Devices: A Brief Review on Their Limits and Applications

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