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Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface
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Nanohojas de marco orgánico cationico para la conducción rápida de iones de litio
Hongwei Chen1, Hangyu Tu1, Chenji Hu2
1College of Materials Science and Engineering, Huaqiao University , Xiamen 361021, People's Republic of China.
Journal of the American Chemical Society
|January 6, 2018
Resumen
Las estructuras orgánicas covalentes (COF) con esqueletos catiónicos incorporados mejoran la conductividad de iones de litio al dividir pares de iones. Este avance ofrece una vía prometedora para electrolitos avanzados en estado sólido en baterías.
Área de la Ciencia:
- Ciencias de los materiales
- La electroquímica
- Iónicos en estado sólido
Sus antecedentes:
- Los marcos orgánicos covalentes (COF) se exploran como electrolitos de estado sólido para baterías de iones de litio debido a su estructura porosa.
- Las sales de litio infiltradas en los COF a menudo forman pares de iones, lo que dificulta la conducción eficiente de iones de litio (Li +).
- El desarrollo de estrategias para disociar estos pares de iones es crucial para mejorar la conductividad iónica.
Objetivo del estudio:
- Para mejorar la conductividad iónica de los COF para aplicaciones de conductores de iones de litio en estado sólido.
- Para abordar la limitación de la difusión iónica lenta causada por el emparejamiento de iones Li+ sal dentro de los poros de COF.
- Investigar el efecto de la incorporación de un esqueleto catiónico en los FOC para mejorar el transporte de Li+.
Principales métodos:
- Diseño y síntesis de COF con un esqueleto catiónico integrado.
- Incorporación de sales de Li+ en la estructura modificada de COF.
- Caracterización electroquímica para medir la conductividad de Li+.
- Análisis de la disociación de pares de iones y de los efectos del cribado dieléctrico.
Principales resultados:
- El esqueleto catiónico filtra efectivamente los pares de iones Li +, aumentando la concentración de iones Li + libres.
- Logró una conductividad de Li+ significativamente mejorada de hasta 2,09 × 10^-4 S cm^-1 a 70 °C.
- Se ha demostrado una alta conductividad iónica en ausencia de cualquier disolvente líquido.
Conclusiones:
- La incorporación de esqueletos catiónicos en los COF es una estrategia efectiva para mejorar la conductividad de Li+ en electrolitos en estado sólido.
- El material COF desarrollado muestra potencial para su uso en baterías avanzadas de iones de litio en estado sólido.
- Este enfoque supera las limitaciones del emparejamiento iónico en los electrolitos tradicionales basados en COF.
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