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Maximizar el despliegue de vanadio en las baterías de flujo redox a través de la quelación

Scott E Waters1, Casey M Davis1, Jonathan R Thurston1

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Un nuevo electrolito de batería de flujo de vanadio que utiliza dietilenetriaminepentaacetato (DTPA) ofrece una alta solubilidad y potencial de reducción. Este avance permite un almacenamiento de energía eficiente a escala de red con mayor seguridad y doble densidad de energía.

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Área de la Ciencia:

  • La electroquímica
  • Ciencias de los materiales
  • Almacenamiento de energía

Sus antecedentes:

  • Las baterías de flujo de vanadio (VFB) son prometedoras para el almacenamiento de energía a escala de red.
  • Los VFB actuales enfrentan desafíos con la solubilidad, la densidad de energía y las condiciones de funcionamiento.

Objetivo del estudio:

  • Desarrollar un electrolito basado en vanadio altamente soluble y reductor para baterías de flujo.
  • Para investigar el rendimiento de un nuevo sistema de batería de flujo de vanadio quelado.

Principales métodos:

  • Adaptación de la coordinación del vanadio a una geometría de 7 coordenadas mediante el uso de dietilenetriaminapentaacetato (DTPA).
  • Espectroelectroquímica in situ para analizar los estados oxidados y reducidos.
  • Montaje y funcionamiento de las baterías de flujo en condiciones de pH casi neutro.

Principales resultados:

  • Se obtiene un electrolito altamente soluble (> 1,3 M) y reductor (-1,2 V frente a Ag/AgCl) [V(DTPA].
  • Baterías de flujo demostrado con densidades de energía de descarga de 12,5 Wh L-1 y alta eficiencia.
  • Desarrolló la primera batería de flujo quelado utilizando el mismo ligando aminopolycarboxylate para ambos electrolitos.

Conclusiones:

  • El electrolito de vanadio quelatado con DTPA ofrece un rendimiento comparable al de los VFB existentes.
  • Este sistema duplica la energía de descarga efectiva del vanadio y minimiza los riesgos de seguridad.
  • Presenta una alternativa viable para el almacenamiento de energía a escala de red.