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Desarrollo basado en el mecanismo de un anólito multielectrónico de bajo potencial, soluble y ciclable para baterías
Christo S Sevov1, Sydney L Fisher2, Levi T Thompson2
1Department of Chemistry, University of Michigan , 930 North University Avenue, Ann Arbor, Michigan 48109, United States.
Journal of the American Chemical Society
|December 10, 2016
Resumen
Los investigadores desarrollaron nuevos complejos de coordinación de metales como anolitos para baterías de flujo redox no acuosas (NRFB). Estos materiales ofrecen una alta solubilidad, múltiples transferencias de electrones y estabilidad, superando las limitaciones clave en el desarrollo de NRFB.
Área de la Ciencia:
- La electroquímica
- Ciencias de los materiales
- Almacenamiento de energía
Sus antecedentes:
- Las baterías de flujo redox no acuosas (NRFB) requieren materiales electroactivos con alta solubilidad, estabilidad y potenciales más allá de los límites del agua.
- Los materiales existentes a menudo carecen de la combinación necesaria de propiedades para NRFB eficientes y duraderos.
Objetivo del estudio:
- Diseñar e identificar nuevos complejos de coordinación de metales (MCC) como anólitos para los NRFB.
- Para superar las limitaciones en el potencial redox, la solubilidad y la estabilidad electroquímica de los anólitos NRFB.
Principales métodos:
- Diseño basado en el mecanismo de los ligandos y centros metálicos de la isoindolina bipiridilimina tridentada (BPI).
- Variación sistemática de los componentes ligandos y metálicos.
- Investigación mecanicista de los ciclos electroquímicos y las vías de descomposición.
Principales resultados:
- Identificación de complejos BPI de níquel estables con una pérdida de capacidad <5% durante 200 ciclos.
- Se ha desarrollado un derivado con alta solubilidad (> 700 mM en acetonitrilo) y múltiples transferencias de electrones (-1,7 y -1,9 V frente a Ag/Ag+).
- Estabilidad demostrada del estado cargado en altas concentraciones durante períodos prolongados.
Conclusiones:
- Se ha identificado con éxito un candidato anolítico prometedor para los NRFB.
- Proporcionó información clave sobre los principios de diseño químico para futuros anólitos basados en MCC.
- Avanzó el desarrollo de baterías de flujo redox no acuosas de alto rendimiento.
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