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Pseudocapacitores de alta capacidad de intercalación de iones de litio en polímeros de coordinación 2D no porosos y

Harish Banda¹, Jin-Hu Dou¹, Tianyang Chen¹

¹Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02138, United States.

Journal of the American Chemical Society

|February 2, 2021

Resumen

Los investigadores desarrollaron un nuevo polímero de coordinación no poroso (CP) para condensadores electroquímicos (EC). Este material demuestra una alta conductividad eléctrica y intercalación de iones seudocapacitiva, aumentando el rendimiento de almacenamiento de energía.

Área de la Ciencia:

Ciencias de los materiales
La electroquímica
Almacenamiento de energía

Sus antecedentes:

Los condensadores electroquímicos (CE) ofrecen una alta densidad de potencia, pero están limitados por una baja densidad de energía.
El alto área de superficie específica y la conductividad eléctrica son cruciales para el rendimiento de la CE.
Los materiales no porosos con alta conductividad eléctrica, como los polímeros de coordinación (PC), a menudo se pasan por alto para aplicaciones CE.

Objetivo del estudio:

Investigar el potencial de los polímeros de coordinación no porosos (PC) como materiales de electrodos para condensadores electroquímicos (CE).
Explorar un nuevo CP no poroso, Ni3 ((benzenohexatiolato) (Ni3BHT), para mejorar el almacenamiento de energía.
Para aclarar el mecanismo de almacenamiento de carga en Ni3BHT para pseudocapacitores de alto rendimiento.

Principales métodos:

Síntesis y caracterización de un nuevo polímero de coordinación no poroso, el Ni3 (benzenohexatiolato) (Ni3BHT).
Prueba electroquímica del Ni3BHT como material de electrodo en electrolitos no acuosos.
Estudios estructurales y electroquímicos para determinar el mecanismo de almacenamiento de carga.

Principales resultados:

El Ni3BHT tiene una alta conductividad eléctrica (> 500 S/m).
El rendimiento del electrodo muestra excelentes capacidades específicas de 245 F/g y 426 F/cm3.
El rendimiento favorable se atribuye a la intercalación pseudocapacitiva de iones Li + entre las capas 2D de Ni3BHT.

Conclusiones:

Se ha demostrado por primera vez la intercalación de iones pseudocapacitivos en un polímero de coordinación no poroso (PC).
El Ni3BHT muestra un potencial significativo para pseudocapacitores de alta energía.
Destaca el vasto potencial de la exploración de PC no porosos para el almacenamiento de energía electroquímica avanzada.

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