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Diseño basado en el ordenamiento catiónico de halospinas de litio superiónicas

Yubo Wang1, Manas Likhit Holekevi Chandrappa2, Issei Otani3

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Resumen

Los investigadores desarrollaron electrolitos sólidos rentables para baterías de estado sólido (ASSB) mediante la sustitución de escandio con metales más baratos. Estos nuevos materiales muestran una conductividad iónica prometedora, allanando el camino para el almacenamiento de energía de próxima generación.

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Área de la Ciencia:

  • Ciencias de los materiales
  • La electroquímica
  • Ciencias de los materiales computacionales

Sus antecedentes:

  • Las baterías de estado sólido (ASSB) requieren electrolitos sólidos inorgánicos (SE) rentables para el almacenamiento de energía de próxima generación.
  • El halospinel prometedor Li2Sc2/3Cl4 SE tiene una alta conductividad iónica, pero está limitado por el alto costo del escandio (Sc).
  • El desarrollo de alternativas de menor coste es crucial para la aplicación práctica de los ASSB.

Objetivo del estudio:

  • Para examinar y sintetizar composiciones de halospinel sustituidas por cationes de bajo costo para electrolitos sólidos.
  • Investigar el impacto de la sustitución catiónica en la conductividad iónica y la estabilidad.
  • Establecer una metodología para predecir y descubrir nuevos materiales sólidos de electrolitos.

Principales métodos:

  • Potencial interatómico de aprendizaje automático universal combinado de M3GNET (UMLIP) y teoría funcional de densidad (DFT) para el cribado eficiente de materiales.
  • Experimentalmente sintetizado predijo Mg2+, Al3+ y Zr4+ sustituido por Li2+, Sc2/3 y Cl4 espineles.
  • Empleó simulaciones de dinámica molecular (MD) con potenciales tensores de momento (MTP) para analizar los mecanismos de transporte de iones.

Principales resultados:

  • Los halospineles sustituidos por Mg2+, Al3+ y Zr4+ sintetizados con fracciones de sustitución del 20,9%37,5%, logran conductividades iónicas de hasta 1,85 mS cm−1.
  • Se ha logrado la sustitución de Fe3+, aunque con una impureza menor de Fe2+.
  • Las simulaciones de MD revelaron que el orden de Li+/Sc3+/Mn+ influye significativamente en la conductividad en composiciones sustituidas desordenadas.
  • Se han demostrado ASSB con Li1.75Sc0.416Zr0.25Cl4 que funcionan a altas densidades de corriente (2 mA cm-2) con una buena retención de capacidad (80% del rendimiento de baja velocidad).

Conclusiones:

  • La sustitución de cationes rentable es una estrategia viable para mitigar el costo del material de los electrolitos sólidos de halospinel a base de Sc.
  • La metodología computacional desarrollada acelera el descubrimiento de nuevos electrolitos sólidos de litio desordenados.
  • Este trabajo proporciona una base para el diseño de ASSB de alto rendimiento a través del diseño de materiales racionales.