Rational Design of an Ionic Liquid‐Based Electrolyte with High Ionic Conductivity Towards Safe Lithium/Lithium‐Ion Batteries

Zhang, Shengjie; Li, Junhao; Jiang, Ningyi; Li, Xuqiu; Pasupath, Sivakumar; Fang, Yanxiong; Liu, Quanbing; Dang, Dai

doi:10.1002/asia.201900581

Cited by 32 publications

(14 citation statements)

References 30 publications

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“…At present, researches on nonflammable ionic liquid electrolytes in LMBs are mainly focused on increasing the salt concentration. [91][92][93][94][95] Dai and coworkers reported nonflammable ionic liquid electrolytes composed of 1-ethyl-3-methylimidazolium (EMIm) cations and highconcentration LiFSI with sodium bis(trifluoromethanesulfonyl) imide (NaTFSI) as an additive. The ionic liquid electrolyte participates in the formation of hybrid interphases and contributes to dense lithium deposition (Figure 6b).…”

Section: Ionic Liquid Electrolytesmentioning

confidence: 99%

Thermally Stable and Nonflammable Electrolytes for Lithium Metal Batteries: Progress and Perspectives

et al. 2021

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In the pursuit of decarbonization and wireless society, highenergy-density secondary batteries are imperative and have attracted much interest around the world. [1][2][3][4] The increasing demand of electric vehicles, portable electronic products, and large-scale grids has promoted intensive research on high-energy-density secondary batteries. [5][6][7][8] Lithium metal battery (LMB) is a promising high-energydensity battery system with a practical specific energy over 350 Wh kg À1 because lithium metal anode has a high theoretical specific capacity (3860 mAh g À1 ) and a low electrode potential (À3.04 V vs standard hydrogen electrode). [9][10][11][12] Generally, when lithium metal anodes are used to replace graphite anodes, the specific energy of lithium metal anode can increase by 40-50% compared with that of lithium-ion batteries (LIBs). [13][14][15][16] In terms of the type of LMBs, intercalation cathodes have unique advantages to match with lithium metal anodes due to the technological maturity and the compatibility with current LIB manufacturing compared with conversion cathodes, such as oxygen and sulfur cathodes. [17][18][19][20][21] By integrating a lithium metal anode with a lithium-rich or nickel-rich layered oxide cathode, the practical specific energy of LMBs with liquid electrolytes can achieve more than 350 Wh kg À1 , becoming a promising high-energy-density battery system in the near future. [22][23][24][25] High safety is the prerequisite for the practical applications of LMBs. In 1985, Moli Energy, a Canada company, produced Li/ MoS 2 batteries (AA batteries, %100 Wh kg À1 ) for the first time and put them on the market as the power of consumer electronics. [26] However, Li/MoS 2 batteries suffer safety issues, such as fire and explosion, when in use. Moli energy had to recall all batteries, and the first attempt toward the commercialization of LMBs fails. The safety issues of LMBs are directly related to the overgrown lithium dendrites and highly flammable liquid electrolytes. [27][28][29] In nature, the formation of lithium dendrites is primarily induced by liquid electrolytes. Consequently, liquid electrolytes dictate not only the life span but also the safety degree of LMBs. LMBs are revived after 2010 due to the strong demand of high-energy-density batteries and the emerging materials and technologies to solve the inherent problems. [30] New electrolyte design, [31][32][33][34][35] composite lithium anode with a 3D host, [36][37][38] artificial coating, [39][40][41][42] and theoretical simulations [43] have been intensively investigated to suppress the formation of lithium dendrites and remarkable advances have been achieved in prolonging the cycle life of LMBs as summarized in recent impactful reviews. [44,45] However, in addition to suppress lithium

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Section: Ionic Liquid Electrolytesmentioning

confidence: 99%

Thermally Stable and Nonflammable Electrolytes for Lithium Metal Batteries: Progress and Perspectives

et al. 2021

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“…LFP cathodes are commonly analyzed with ether functionalized ILs as described in the previous sections and it is the cathode material of choice for the electrochemical characterization of ether functionalized pyrrolidinium-based ILs. Zhang et al [209] designed an ether functionalized IL, 1-(2-ethoxyethyl)-1methylpyrrolidinium bis(trifluoromethylsulfonyl) imide (PYR 1(2o2) TFSI) in order to investigate lower viscosity, facilitate the formation of passivation layers and to enhance electrochemical stability. This IL was analyzed with LiTFSI salt, and as a cosolvent with DMC and LiTFSI salt.…”

Section: Liquid Electrolytementioning

confidence: 99%

Pyrrolidinium Containing Ionic Liquid Electrolytes for Li-Based Batteries

McGrath

Rohan

2020

Molecules

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Ionic liquids are potential alternative electrolytes to the more conventional solid-state options under investigation for future energy storage solutions. This review addresses the utilization of IL electrolytes in energy storage devices, particularly pyrrolidinium-based ILs. These ILs offer favorable properties, such as high ionic conductivity and the potential for high power drain, low volatility and wide electrochemical stability windows (ESW). The cation/anion combination utilized significantly influences their physical and electrochemical properties, therefore a thorough discussion of different combinations is outlined. Compatibility with a wide array of cathode and anode materials such as LFP, V2O5, Ge and Sn is exhibited, whereby thin-films and nanostructured materials are investigated for micro energy applications. Polymer gel electrolytes suitable for layer-by-layer fabrication are discussed for the various pyrrolidinium cations, and their compatibility with electrode materials assessed. Recent advancements regarding the modification of typical cations such a 1-butyl-1-methylpyrrolidinium, to produce ether-functionalized or symmetrical cations is discussed.

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“…However, the relatively high viscosity of ILs is a barrier to further practical applications. Inserting ether groups into the cations of ILs has been shown to substantially reduce their viscosity without lowering thermal stability, while also reducing their toxicity [ 7 , 8 , 9 , 10 ]. Ether-functionalized ILs (EFILs) have demonstrated remarkable performance in many fields.…”

Section: Introductionmentioning

confidence: 99%

A New Compartmentalized Scale (PN) for Measuring Polarity Applied to Novel Ether-Functionalized Amino Acid Ionic Liquids

Guo

et al. 2022

Molecules

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Functionalized and environmentally friendly ionic liquids are required in many fields, but convenient methods for measuring their polarity are lacking. Two novel ether-functionalized amino acid ionic liquids, 1-(2-methoxyethyl)-3-methylimidazolium alanine ([C1OC2mim][Ala]) and 1-(2-ethoxyethyl)-3-methylimidazolium alanine ([C2OC2mim][Ala]), were synthesized by a neutralization method and their structures confirmed by NMR spectroscopy. Density, surface tension, and refractive index were determined using the standard addition method. The strength of intermolecular interactions within these ionic liquids was examined in terms of standard entropy, lattice energy, and association enthalpy. A new polarity scale, PN, is now proposed, which divides polarity into two compartments: the surface and the body of the liquid. Surface tension is predicted via an improved Lorentz-Lorenz equation, and molar surface entropy is used to determine the polarity of the surface. This new PN scale is based on easily measured physicochemical parameters, is validated against alternative polarity scales, and is applicable to both ionic and molecular liquids.

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Rational Design of an Ionic Liquid‐Based Electrolyte with High Ionic Conductivity Towards Safe Lithium/Lithium‐Ion Batteries

Cited by 32 publications

References 30 publications

Thermally Stable and Nonflammable Electrolytes for Lithium Metal Batteries: Progress and Perspectives

Thermally Stable and Nonflammable Electrolytes for Lithium Metal Batteries: Progress and Perspectives

Pyrrolidinium Containing Ionic Liquid Electrolytes for Li-Based Batteries

A New Compartmentalized Scale (PN) for Measuring Polarity Applied to Novel Ether-Functionalized Amino Acid Ionic Liquids

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