Crystalline Lithium Imidazolate Covalent Organic Frameworks with High Li-Ion Conductivity
Por:
Hu Y., Dunlap N., Wan S., Lu S., Huang S., Sellinger I., Ortiz M., Jin Y., Lee S.-H., Zhang W.
Publicada:
1 ene 2019
Resumen:
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 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 weak Li ion-imidazolate binding interactions and well-defined porous 2D framework structures of such ICOFs. We also investigated the structure-property relationship by varying the 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. Copyright © 2019 American Chemical Society.
Filiaciones:
Hu Y.:
Department of Chemistry, University of Colorado, Boulder, CO 80309, United States
Dunlap N.:
Department of Mechanical Engineering, University of Colorado, Boulder, CO 80309, United States
Wan S.:
NCO Technologies LLC, Concord, NC 28027, United States
Lu S.:
Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi, 214122, China
Huang S.:
Department of Chemistry, University of Colorado, Boulder, CO 80309, United States
Sellinger I.:
Department of Chemistry, University of Colorado, Boulder, CO 80309, United States
Ortiz M.:
Department of Chemistry, University of Colorado, Boulder, CO 80309, United States
Jin Y.:
NCO Technologies LLC, Concord, NC 28027, United States
Lee S.-H.:
Department of Mechanical Engineering, University of Colorado, Boulder, CO 80309, United States
Zhang W.:
Department of Chemistry, University of Colorado, Boulder, CO 80309, United States
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