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Crystalline Lithium Imidazolate Covalent Organic Frameworks with High Li-ion Conductivity.

08:00 EDT 15th April 2019 | BioPortfolio

Summary of "Crystalline Lithium Imidazolate Covalent Organic Frameworks with High Li-ion Conductivity."

Ionic covalent organic frameworks (ICOFs) have recently emerged as promising candidates for solid state electrolytes. Herein, we report the first example of a series of crystalline imidazolate-containing ICOFs as single-ion conducting COF solid electrolyte materials, where lithium cations freely travel through the intrinsic 2D channels with outstanding ion conductivity (up to 7.2 × 10-3 S cm-1) and impressively low activation energy (as low as 0.10 eV). These properties are attributed to the week Li ion-imidazolate binding interactions and well-defined porous 2D framework structures of such ICOFs. We also investigated the structure-property relationship by varying electronic properties of substituents (electron donating/withdrawing) that covalently attached to the imidazolate groups. We found electron withdrawing substituents significantly improve the ion conducting ability of imidazolate-ICOF by weakening ion pair interactions. Our study provides a convenient bottom-up approach toward a novel class of highly efficient single-ion conducting ICOFs which could be used in all solid-state electrolytic devices.

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This article was published in the following journal.

Name: Journal of the American Chemical Society
ISSN: 1520-5126
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