Liquid crystalline lithium-ion electrolytes derived from biodegradable cyclodextrin
| Autor: | Vladimir K. Michaelis, Kyle Hofstetter, Amit Bhattacharya, Haoyang Yu, Vance E. Williams, Simon Trudel, Sourav Bag, Chang-Chun Ling, Venkataraman Thangadurai, David Ester, Carson Zellman, Pier-Luc Champagne |
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| Rok vydání: | 2019 |
| Předmět: |
chemistry.chemical_classification
Materials science Cyclodextrin Renewable Energy Sustainability and the Environment Metal ions in aqueous solution chemistry.chemical_element 02 engineering and technology General Chemistry 021001 nanoscience & nanotechnology Thermotropic crystal chemistry Chemical engineering Ionic conductivity Molecule General Materials Science Lithium Cyclic voltammetry 0210 nano-technology Alkyl |
| Zdroj: | Journal of Materials Chemistry A. 7:12201-12213 |
| ISSN: | 2050-7496 2050-7488 |
| DOI: | 10.1039/c9ta01852b |
| Popis: | The first family of lithium-ion electrolytes based on thermotropic liquid crystalline (LC) cyclodextrin (CD) is reported. The new electrolytes consist of composites of self-assembling and environment-friendly amphiphilic β-CDs with lithium bistrifluoromethanesulfonimidate (LiTFSI). The unique geometry of the CD scaffold allows for efficient control of the amphiphilicity of the molecule through chemical derivatizations. The introduction of non-polar alkyl chains at the primary face of CD and multiple short and polar nitrile-terminated tetraethylene glycol chains at the other face provides a new class of LC materials capable of self-organization into homeotropically-aligned smectic mesophases, which retain long-range order over a wide temperature window. The assembly of numerous ethoxy groups at the secondary face of CD serves as an elegant pre-organization of the ion-chelating groups to form two-dimensional ion-conducting pathways, facilitating the directional motion of metal ions. Studies of several LC composites with LiTFSI have revealed promising thermal stability and ionic conductivity. Solid-state NMR studies have uncovered an activation energy of 0.14 eV for lithium diffusion, while cyclic voltammetry confirmed the composites remain electrochemically stable over a potential range of up to ∼3 V versus Li/Li+. These results demonstrate the great potential of this new class of organic electrolytes for different metal ions. |
| Databáze: | OpenAIRE |
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