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Recorrido rápido de transporte de iones proporcionado por el polietileno glicol confinado en marcos orgánicos

Zhenbin Guo¹, Yuanyuan Zhang¹, Yu Dong¹

¹Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials, Key Laboratory of Cluster Science, Ministry of Education, School of Chemistry and Chemical Engineering , Beijing Institute of Technology , Beijing 100081 , People's Republic of China.

Journal of the American Chemical Society

|January 19, 2019

Resumen

La incorporación de polietileno glicol (PEG) en marcos orgánicos covalentes (COF) mejora la conducción de iones de litio (Li +). Esta estrategia mejora el transporte de iones en electrolitos en estado sólido, ofreciendo una ruta prometedora para materiales avanzados de baterías.

Área de la Ciencia:

Ciencias de los materiales
La electroquímica
Nanotecnología

Sus antecedentes:

Las estructuras orgánicas covalentes (COF) poseen canales adaptados para la conducción iónica.
La incorporación directa de sales de litio en los COF limita el transporte de iones debido a las fuertes interacciones y la falta de un medio de transporte.

Objetivo del estudio:

Desarrollar una estrategia para mejorar la conducción de Li+ en los FOC.
Investigar el papel del polietilenglicol (PEG) en la facilitación del transporte de iones dentro de los canales de COF.

Principales métodos:

Incorporación de polietileno glicol de bajo peso molecular (PEG) en COF con cargas esqueléticas variables (aniónicas, neutras, catiónicas).
Caracterización de la conductividad iónica en los COF infundidos con PEG.

Principales resultados:

El PEG confinado dentro de los canales de COF mantiene la flexibilidad y la capacidad de solvatación de Li+.
Se logró una conductividad iónica de 1,78 × 10^-3 S cm^-1 a 120 °C para el PEG en un COF catiónico.
La estrategia es simple y aplicable a diversos materiales porosos cristalinos.

Conclusiones:

La incorporación de PEG en los COF acelera significativamente la conducción de Li+.
Este enfoque ofrece un método prometedor para diseñar conductores iónicos de alto rendimiento en estado sólido.
La versatilidad de los COF y la eficacia del PEG presentan oportunidades para soluciones avanzadas de almacenamiento de energía.

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