New Ether‐functionalized Morpholinium‐ and Piperidinium‐based Ionic Liquids as Electrolyte Components in Lithium and Lithium–Ion Batteries

Navarra, Maria Assunta; Fujimura, Kanae; Sgambetterra, Mirko; Tsurumaki, Akiko; Panero, S.; Nakamura, Nobuhumi; Ohno, Hiroyuki; Scrosati, B.

doi:10.1002/cssc.201700346

Cited by 41 publications

(52 citation statements)

References 38 publications

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“…The anodic stability of the neat ILs and Li‐containing (20 mol %) electrolytes considered in this work is always above 5 V (even considering the threshold at 0.01 mA cm −2 ) with the anodic stability of DEMEFTFSI 0.8 LiFTFSI 0.2 electrolyte slightly higher than that of DEMEFSI 0.8 LiFSI 0.2 (Figure S2 in the Supporting Information). Concerning the cathodic stability, a few features were observed below 1.5 V for DEME‐based ILs, which are probably related to the reduction of the ether‐functionalized cation . However, the reduction stability is effectively improved by the addition of the lithium salt, making these IL‐based electrolytes suitable for application in high‐voltage batteries.…”

Section: Resultsmentioning

confidence: 97%

“…Concerning the cathodic stability, af ew features were observed below 1.5 Vf or DEME-based ILs, which are probably related to the reductiono ft he ether-functionalizedc ation. [28] However,t he reductions tabilityi se ffectively improved by the addition of the lithium salt, making these IL-based electrolytes suitable for applicationi nh igh-voltage batteries.…”

Section: Resultsmentioning

confidence: 99%

“…Their relatively high viscosity and, thus, lower conductivity limits the rate capabilities of IL-based cells. Conventional strategies propose mixingt he ILs with organic solvents [28] or increasing the cell operating temperature [31] to mitigate this problem. However,i ti sn ot clear whether viscosity and conductivity are the only parameters restricting rate performance.…”

Section: Resultsmentioning

confidence: 99%

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Concentrated Ionic‐Liquid‐Based Electrolytes for High‐Voltage Lithium Batteries with Improved Performance at Room Temperature

Gao

Mariani

et al. 2019

ChemSusChem

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Ionic liquids (ILs) have been widely explored as alternative electrolytes to combat the safety issues associated with conventional organic electrolytes. However, hindered by their relatively high viscosity, the electrochemical performances of IL‐based cells are generally assessed at medium‐to‐high temperature and limited cycling rate. A suitable combination of alkoxy‐functionalized cations with asymmetric imide anions can effectively lower the lattice energy and improve the fluidity of the IL material. The Li/Li1.2Ni0.2Mn0.6O2 cell employing N‐N‐diethyl‐N‐methyl‐N‐(2‐methoxyethyl)ammonium (fluorosulfonyl)(trifluoromethanesulfonyl)imide (DEMEFTFSI)‐based electrolyte delivered an initial capacity of 153 mAh g−1 within the voltage range of 2.5–4.6 V, with a capacity retention of 65.5 % after 500 cycles and stable coulombic efficiencies exceeding 99.5 %. Moreover, preliminary battery tests demonstrated that the drawbacks in terms of rate capability could be improved by using Li‐concentrated IL‐based electrolytes. The improved room‐temperature rate performance of these electrolytes was likely owing to the formation of Li+‐containing aggregate species, changing the concentration‐dependent Li‐ion transport mechanism.

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Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Concentrated Ionic‐Liquid‐Based Electrolytes for High‐Voltage Lithium Batteries with Improved Performance at Room Temperature

Gao

Mariani

et al. 2019

ChemSusChem

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“…It is well recognized that functionalized cations of ILs exert their impacts on the physicochemical and electrochemical properties of electrolyte via the interaction of functional groups with lithium ions . Spectroscopy of FTIR, Raman and NMR are frequently employed to detect the changes of lithium ion solvation.…”

Section: Resultsmentioning

confidence: 99%

Enhancing High‐Rate Capability by Introducing Phosphonate Functionalized Imidazolium Ionic Liquid into Organic Carbonate Electrolyte

et al. 2018

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A phosphonate functionalized imidazolium ionic liquid (PFIL) is synthesized and studied as an electrolyte additive for lithium ion batteries. The Li/LiFePO4 cells with addition of PFIL shows superior electrochemical performance, including an increased initial Coulombic efficiency, better capacity retention, and improved rate capability. The electrochemical mechanism of PFIL used in high‐performance batteries is investigated by using fourier transform infrared spectroscopy (FTIR) and nuclear magnetic resonance (NMR). Our experimental result reveals that the phosphonate groups are stronger donors than carbonate groups, thus change the solvation environment of lithium ions by competitive coordination, assisting the transferring of lithium ions. Therefore, an excellent cyclability and superior rate capability with PFIL‐based electrolyte could be explained by enhanced mobility lithium ions via coordination to phosphonate groups on imidazolium cations. This work displays that PFIL‐based electrolyte systems can be considerable potential candidates for the applications in high‐performance Li‐ion batteries.

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“…2018, 2, 1700183 Although nonaqueous electrolytes have been studied for decades and successfully utilized in the current commercialized Li-ion batteries, they could not be applied in Li-O 2 battery systems directly because of the above special requirements. [60,61,[72][73][74][75][76][77][78][79][80] There have been many publications regarding Li-O 2 battery systems and considerable achievements, but perfect nonaqueous electrolytes have not yet been found. [69,81,82] Based on the above research, an ideal nonaqueous electrolyte for Li-O 2 battery systems should satisfy the following demands: (i) high physical stability, including low volatility or low vapor pressure, low moisture absorption, and nonflammability; (ii) stable solid electrolyte interphase formation on the surface of the lithium metal anode; (iii) outstanding oxygen solubility and diffusivity; and (iv) excellent chemical and electrochemical stability, especially in the presence of superoxide radicals (O 2 − ).…”

Section: Electrolyte Requirementsmentioning

confidence: 99%

Review of Electrolytes in Nonaqueous Lithium–Oxygen Batteries

Guo

Luo

Chen

et al. 2018

Advanced Sustainable Systems

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Based on an inexhaustible and ubiquitous source of oxygen, the lithium-oxygen batteries are currently the subject of much scientific investigation because of their potential for extremely high energy density. The electrocatalytic materials for them have been extensively researched during the past decade. Even though they are a key component in the lithium-oxygen batteries, however, the study of electrolytes is still in its primary stage. Electrolytes have an important influence on the electrochemical performance of lithium-oxygen batteries, especially on their cycling stability and rate capacity. Therefore, it is important to select an ideal electrolyte with excellent stability against attack by reaction intermediates, along with excellent oxygen solubility and diffusivity. In this review, the physicochemical and electrochemical properties of organic electrolytes for lithium-oxygen batteries are discussed and compared. Furthermore, possible research directions are proposed for the development of an ideal electrolyte for enhanced electrochemical performance. Disciplines Engineering | Physical Sciences and Mathematics Publication DetailsGuo, H., Luo, W., Chen, J., Chou, S., Liu, H. & Wang, J. (2018 Figure 1. Unlike the intercalation mechanism of lithium-ion batteries or sodium-ion batteries, the Li-O 2 battery systems employ a dissolution/ deposition reaction with an air electrode that uses oxygen as the cathode electrode during the electrochemical processes. Research on the Li-O 2 battery is complicated by the need for exposure the air cathode to O 2 atmosphere.Many advances have been achieved, which include advances on cathode materials, electrolytes, anode materials, and redox mediators. [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24] Several excellent reviews have been published to summarize recent developments and our current understanding of Li-O 2 batteries, especially with respect to the cathode electrocatalytic materials. [25][26][27][28][29][30][31][32][33][34][35] These reviews have comprehensively discussed the relationship between the structure of electrocatalytic materials and the electrochemical performance of Li-O 2 batteries. There are, however, few reviews focused on the effects of different electrolytes on the electrochemical performance of the Li-O 2 batteries. [36][37][38] For the aqueous Li-O 2 batteries, LiOH is generated or oxidized at the cathode during discharge and charge processes because H 2 O and O 2 are involved in the reactions. In the case of the nonaqueous Li-O 2 batteries, there are two essential processes that determine their electrochemical performance: the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER). During the ORR process, the Li 2 O 2 is precipitated as the final discharge product on the air cathode, while during the OER process, Li 2 O 2 is then decomposed and the O 2 is regenerated. Therefore, there are huge differences between aqueous and nonaqueous Li-O 2 batteries. Since the nonaqueous Li-O 2 batteries have dominated ...

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New Ether‐functionalized Morpholinium‐ and Piperidinium‐based Ionic Liquids as Electrolyte Components in Lithium and Lithium–Ion Batteries

Cited by 41 publications

References 38 publications

Concentrated Ionic‐Liquid‐Based Electrolytes for High‐Voltage Lithium Batteries with Improved Performance at Room Temperature

Concentrated Ionic‐Liquid‐Based Electrolytes for High‐Voltage Lithium Batteries with Improved Performance at Room Temperature

Enhancing High‐Rate Capability by Introducing Phosphonate Functionalized Imidazolium Ionic Liquid into Organic Carbonate Electrolyte

Review of Electrolytes in Nonaqueous Lithium–Oxygen Batteries

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