Nanostructured Aqueous Lithium-Ion Conductors Formed by the Self-Assembly of Imidazolium-Type Zwitterions

Gao, Xinpei; Lü, Fei; Shi, Lijuan; Jia, Han; Gao, Hejun

doi:10.1021/am404288x

Cited by 43 publications

(42 citation statements)

References 38 publications

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“…The co-existence of lamellar structure with cubic phase (eg. Ia3d or Pn3m) has also been observed in the self-assembly of cationic surfactant/ethoxylated polyions complex salts by the addition of n-decanol [34] and imidazolium-based zwitterions with lithium bis(trifluoromethanesulfonyl)imide [35]. 26.5 and 34.9% (w/w).…”

Section: Poly [C 16 Vim + ][ Bf 4 -]mentioning

confidence: 81%

“…In this case, the bicontinuous cubic phase has to convert into lamellar structure in order to minimize the conformational energy. In fact, such a space-filling dependence can also be verified by the fact that the decrease of temperature facilitates the transition from a bicontinuous cubic phase to a lamellar phase [34,35]. ] displays a sharper first-order diffraction than the corresponding gel sample, implying that the former possesses more ordered lamellar structures.…”

Section: Saxsmentioning

confidence: 86%

See 1 more Smart Citation

Structural evolution of imidazolium-based poly (ionic liquid) assemblies during solvent evaporation

Ge¹,

Lou²,

Ju³

et al. 2017

Express Polym. Lett.

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The fabrication of polymer-based assemblies with molecular packing at different length scales has recently received a great deal of attention due to their promising potentials to produce functional, nanostructured materials [1][2][3][4][5]. Amphiphilic block or graft copolymers are common candidates for such self-assembled organization and ordering in nano-, and mesoscale. This self-assembly behavior is normally driven by a variety of covalent interaction and noncovalent interactions (e.g., electrostatics, hydrogen bonding, and van der Waals interactions). In terms of morphology versatility, copolymers with amphiphilic characteristic can self-assemble into various structures such as micelles, vesicles in their aqueous or organic solution, and lamellar, hexagonally packed cylinder, spherical, and gyroid structures in their solid bulk [6][7][8][9][10][11]. The size and morphology of these ordered structures are dependent on the composition, molecular weight, processing characteristics, especially on the balance between the hydrophobic domains and the hydrophilic domains. Ionic liquids (ILs) have been paid increasingly attention because of their unique properties such as non-volatility, nonflammability, high thermal stability and tunable solvation interactions [12]. Those unique properties can be tuned by modifying the combination of cations and anions, displaying a 'designer -]/DMF mixture shows a lamellar structure with a tiny minority of bicontinuous cubic phase that disappears instead in the corresponding dried samples caused by the decrease in space-filling requirement for alkyl chains arrangement. For poly [C 16 VIm + ][PF 6 -], there is almost no change in inner structures with solvent evaporation except a more ordered lamellar morphology observed in the dried sample. Notably, an interdigitated packing of alkyl tails dominates the lamellar sheets for all dried PIL samples. These results indicate that the design and fabrication of PIL assemblies with ordered structures can be achieved by simply changing counteranion and solvent content, which offers a feasible approach for engineering PIL-based nano-scale functional materials.

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Section: Poly [C 16 Vim + ][ Bf 4 -]mentioning

confidence: 81%

Section: Saxsmentioning

confidence: 86%

Structural evolution of imidazolium-based poly (ionic liquid) assemblies during solvent evaporation

Ge¹,

Lou²,

Ju³

et al. 2017

Express Polym. Lett.

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“…23 Our work here is the first such study of the H II to Q II transformations in oriented lipid systems, with any cubic phase morphology; the kinetics of H II to Q II transformations have been studied on unoriented systems, 24 and this particular transformation has been investigated as the basis for stimuli-responsive drug release. 10 Moreover, ours is the first study on the epitaxy of transformations between the hexagonal cylindrical and diamond bicontinuous cubic topologies in any material; the diamond phase is very rare in type I lyotropic liquid crystals or block copolymers, 4,25 so type II lipidic liquid crystals represent an attractive target system.…”

Section: ■ Introductionmentioning

confidence: 94%

Experimental Evidence for Proposed Transformation Pathway from the Inverse Hexagonal to Inverse Diamond Cubic Phase from Oriented Lipid Samples

et al. 2015

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A macroscopically oriented inverse hexagonal phase (HII) of the lipid phytantriol in water is converted to an oriented inverse double diamond bicontinuous cubic phase (QII(D)). The initial HII phase is uniaxially oriented about the long axis of a capillary with the cylinders parallel to the capillary axis. The HII phase is converted by cooling to a QII(D) phase which is also highly oriented, where the cylindrical axis of the former phase has been converted to a ⟨110⟩ axis in the latter, as demonstrated by small-angle X-ray scattering. This epitaxial relationship allows us to discriminate between two competing proposed geometric pathways to convert HII to QII(D). Our findings also suggest a new route to highly oriented cubic phase coatings, with applications as nanomaterial templates.

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“…Zhou and co-workers explored a new SPE based on N-ethyl-N-methyl imidazolium tetrafluoroborate (EMIBF 4 ), lithium tetrafluoroborate (LiBF 4 ) and poly(vinylidene difluoride-co-hexafluoropropylene)[P(VdF-HFP)] copolymer. [217] They also formed nanostructures of aqueous Li + conductors with different geometries such as hexagonal, lamellar, and bicontinuous cubic through the self-assembly of this electrolyte. Energy Mater.…”

Section: Wwwadvancedsciencenewscommentioning

confidence: 99%

“…Energy Mater. [217] The incorporation of well-defined and ordered crystal structures into this IL modified the mechanism of conduction from diffusion to hopping and enhanced the Li + conductivity. [216] Li 4 Ti 5 O 12 /SPE/LiCoO 2 cells exhibited the capacities of 78, 65, and 57 mAh g −1 at 0.1, 0.2, and 0.5 mA cm −2 current densities, subsequently, very less than theoretical value of 175 mAh g −1 .…”

Section: Wwwadvancedsciencenewscommentioning

confidence: 99%

Zwitterions for Organic/Perovskite Solar Cells, Light‐Emitting Devices, and Lithium Ion Batteries: Recent Progress and Perspectives

Islam

Pervaiz

et al. 2019

Advanced Energy Materials

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are covalently bonded and their unique characteristics enable them to demonstrate special performance in applications and distinguish them from other conventional organic salts. [12][13][14] Recently, a significant attention has been paid to the use of zwitterions owing to their solubility in polar solvents for solution processing, [15][16][17] and dipole formation for the transfer of carriers [18][19][20] and ions. [21][22][23] Zwitterions have emerged as alternatives to the widely used building blocks such as conventional ionic groups, for developing new functional materials. The presence of both negative and positive ions in the same molecule enables zwitterions to develop interfacial dipole. The ability of zwitterions to develop interfacial dipole provides a new pathway to utilize them as interfacial layer in optoelectronic devices, including organic solar cells (OSCs), perovskite solar cells (PVSCs), and organic light-emitting devices (OLEDs), as well as electrolyte additives for energy devices such as lithium ion batteries (LIBs).It is well known that the ability to transport the charge carriers between the electrodes and organic layers is very crucial to obtain highly efficient electronic devices. [24] A mismatch between the energy levels of organic layers and inorganic electrodes leads to the generation of an energy barrier that hampers the extraction or injection of charge carriers. [25] To get rid of this obstacle, an interlayer between the electrodes and organic layers is applied to facilitate the transfer of charges in organic devices. In OLEDs, interlayers are used to enhance charge injection and reduce the height of Schottky barrier. While in the case of OSCs and PVSCs, apart from the enhancement in charge injection, they also play an important role to increase the built-in electric field across the active layer, ensuring efficient extraction of photogenerated charge carriers. [26][27][28][29][30] Therefore, the design and development of effective interlayer materials for interfacial modification are crucial for high-performance electronic devices. Recently, some significant advances have been demonstrated by applying an interfacial layer between the electrodes and organic layers, resulting in power conversion efficiencies (PCEs) to exceed 14% for single-junction OSCs by choosing appropriate photoactive layer. [31,32] Among different interlayer materials used so far, zwitterionic materials have been proved Zwitterions, a class of materials that contain covalently bonded cations and anions, have been extensively studied in the past decades owing to their special features, such as excellent solubility in polar solvents, for solution processing and dipole formation for the transfer of carriers and ions. Recently, zwitterions have been developed as electrode modifiers for organic solar cells (OSCs), perovskite solar cells (PVSCs), and organic light-emitting devices (OLEDs), as well as electrolyte additives for lithium ion batteries (LIBs).With the rapid advances of zwitterionic materials, high-performan...

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Nanostructured Aqueous Lithium-Ion Conductors Formed by the Self-Assembly of Imidazolium-Type Zwitterions

Cited by 43 publications

References 38 publications

Structural evolution of imidazolium-based poly (ionic liquid) assemblies during solvent evaporation

Structural evolution of imidazolium-based poly (ionic liquid) assemblies during solvent evaporation

Experimental Evidence for Proposed Transformation Pathway from the Inverse Hexagonal to Inverse Diamond Cubic Phase from Oriented Lipid Samples

Zwitterions for Organic/Perovskite Solar Cells, Light‐Emitting Devices, and Lithium Ion Batteries: Recent Progress and Perspectives

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