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Almacenamiento eficiente de carga en condensadores electroquímicos de doble redox a través de la complejación sólida

Brian Evanko¹, Seung Joon Yoo², Sang-Eun Chun³

¹Materials Department, University of California , Santa Barbara, California 93106, United States.

Journal of the American Chemical Society

|July 22, 2016

Resumen

Los condensadores electroquímicos mejorados con redox (redox EC) muestran un rendimiento mejorado al retener electrolitos dentro de los electrodos. Un nuevo pentil viologen/electrolito de bromuro ofrece alta energía y estabilidad para el almacenamiento avanzado de energía.

Área de la Ciencia:

La electroquímica
Ciencias de los materiales
Almacenamiento de energía

Sus antecedentes:

Los condensadores electroquímicos mejorados con redox (redox EC) ofrecen un potencial de alta densidad de energía.
La retención de electrolitos dentro de los electrodos porosos es crucial para un rendimiento estable y eficiente.
Los métodos existentes a menudo enfrentan desafíos con la pérdida de electrolitos y la estabilidad limitada.

Objetivo del estudio:

Investigar mecanismos para mejorar la retención de electrolitos en EC redox.
Identificar nuevos sistemas de electrolitos para el almacenamiento de energía electroquímica de alto rendimiento.
Demostrar los principios de diseño para EC redóxicas estables y eficientes.

Principales métodos:

Utilizando la complejación sólida inducida por contreriones reversibles para retener especies redox activas (bromuro y viólogo).
Desarrollo y ensayo de un nuevo sistema de electrolitos de pentil viógeno/bromuro (PV/Br).
Caracterización del rendimiento electroquímico, incluida la energía específica, la eficiencia coulombina y la estabilidad del ciclo.

Principales resultados:

El PV/Br redox EC alcanzó una energía específica de 48,5 W·h/kg/día a 0,5 A/día.
Se ha demostrado una eficiencia de Coulomb excepcional (99,7%) y estabilidad durante 10.000 ciclos.
El dispositivo funcionó efectivamente con polaridad inversa, lo que indica un diseño robusto.

Conclusiones:

La complejación sólida inducida por contreriones reversibles es una estrategia eficaz para mejorar el rendimiento de la EC redox.
El electrolito de pentilviólogo/bromuro representa un avance significativo en el almacenamiento de energía de alto rendimiento.
Este trabajo proporciona principios clave de diseño para el desarrollo futuro de condensadores electroquímicos estables y eficientes.

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