Spectroscopic and DFT studies to understand the liquid formation mechanism in the LiTFSI/acetamide complex system

Hu, Yuwei; Wang, Zhaoxiang; Li, Hong; Huang, Xuejie; Chen, Liquan

doi:10.1016/j.saa.2004.07.032

Cited by 28 publications

(17 citation statements)

References 17 publications

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“…From the view of these results, COF with amine functional groups in structure (dCOF‐NH 2 ‐60) shows higher conductivity compared with the defect‐free one (TPB‐DHTP‐COF). This phenomenon may be owing to the factor that polar amine groups can interact with the oxygen atom of OSO groups in TFSI − through hydrogen bonding, which could result in weakening and even interrupting the bonding between the Li + and TFSI − , thereby facilitating the dissociation of ion pairs and enhancing Li + transport in the electrolyte . Obviously, COFs incorporated with higher density cationic imidazolium functional groups after postfunctionalization and TFSI − as counter‐ion in the frameworks exhibit higher lithium‐ion conductivity.…”

Section: Resultsmentioning

confidence: 99%

Defective 2D Covalent Organic Frameworks for Postfunctionalization

Liu

et al. 2020

Adv Funct Materials

130

107

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Defects are deliberately introduced into covalent organic frameworks (COFs) via a three‐component condensation strategy. The defective COFs (dCOF‐NH2‐Xs, X = 20, 40, and 60) possess favorable crystallinity and porosity, as well as have active amine functional groups as anchoring sites for further postfunctionalization. By introducing imidazolium functional groups onto the pore walls of COFs via the Schiff‐base reaction, dCOF‐ImBr‐Xs‐ and dCOF‐ImTFSI‐Xs‐based materials are employed as all‐solid‐state electrolytes for lithium‐ion conduction with a wide range of working temperatures (from 303 to 423 K), and the ion conductivity of dCOF‐ImTFSI‐60‐based electrolyte reaches 7.05 × 10−3 S cm−1 at 423 K. As far as it is known, it is the highest value for all polymeric crystalline porous material based all‐solid‐state electrolytes. Furthermore, Li/dCOF‐ImTFSI‐60@Li/LiFePO4 all‐solid Li‐ion battery displays satisfactory battery performance under 353 K. This work not only provides a new methodology to construct COFs with precisely controlled defects for postfunctionalization, but also makes them promising candidate materials as all‐solid‐state electrolytes for lithium‐ion batteries operate at high temperatures.

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Section: Resultsmentioning

confidence: 99%

Defective 2D Covalent Organic Frameworks for Postfunctionalization

Liu

et al. 2020

Adv Funct Materials

130

107

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“…[30][31][32][33][34][35][36][37][38] vibration of the amide with a very weak hydrogen bond with the bulky TFSIanion. 31,32,37 The N-H stretch around 3326 cm -1 is red-shifted due to more effective hydrogen bonding with the other amide molecules. The band located at 3600 cm -1 can be attributed to absorbed water in the liquid DES.…”

Section: Resultsmentioning

confidence: 99%

Eutectogels: A New Class of Solid Composite Electrolytes for Li/Li-Ion Batteries

et al. 2018

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Here, we introduce deep eutectic solvent (DES)-silica composites as a promising candidate for solid composite electrolytes (SCEs). The proposed DES-based gel electrolytes, further referred to as eutectogels (ETGs), are characterized by high ionic conductivity (1.46 mS cm-1), thermal (up to 130 °C), and electrochemical stability (up to 4.8 volts) and are chemically inert to solvents and water. These ETGs can be easily processed and potentially at lower costs compared to ionicliquid-based composite electrolytes. The good prospects of ETGs for application in Li/Li-ion batteries are demonstrated by stable cycling of Li/ETG/LiFePO4 cells over 100 cycles at C/10.

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“…4). The 400 cm À1 peak is most likely the two SO 2 wagging mode peaks in LiTFSI at 388 cm À1 and 437 cm À1 shifted together and broadened due to a change in surrounding, as has previously been observed for other systems [17][18][19]. Furthermore, Fujii et al [20] obtained a similar broad peak for the EMITFSI IL system, and concluded it to consist of contributions due to both cisoid (C 1 ) and transoid (C 2 ) TFSI conformers.…”

Section: Molecular Structure and Interactionsmentioning

confidence: 55%