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Materiales de oxihálidos amorfos para lograr la conducción superiónica de litio

Shumin Zhang1, Feipeng Zhao1, Lo-Yueh Chang2

  • 1Department of Mechanical and Materials Engineering, Western University, London, ON N6A 5B9, Canada.

Journal of the American Chemical Society
|January 29, 2024
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Resumen
Este resumen es generado por máquina.

Los componentes amorfos en electrolitos sólidos halogenados (SE) son cruciales para la conducción rápida de iones en las baterías de estado sólido (ASSB). La incorporación de oxígeno en SE halogenados a base de zirconio crea estructuras amorfas que mejoran la conductividad iónica y el rendimiento de la batería.

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Área de la Ciencia:

  • Ciencias de los materiales
  • La electroquímica
  • Química del estado sólido

Sus antecedentes:

  • Los electrolitos sólidos basados en haluros son prometedores para las baterías de estado sólido debido a su conductividad iónica y estabilidad electroquímica.
  • El papel de los componentes amorfos en los SE halogenados, particularmente en la conducción de iones de litio, sigue siendo poco explorado.

Objetivo del estudio:

  • Investigar la presencia y el impacto comunes de los componentes amorfos en los SE halogenados preparados mecanicamente.
  • Para aclarar la relación entre la química local en las fases amorfas y la migración rápida de iones de litio.
  • Explorar el efecto de la incorporación de oxígeno en la amorfización y las propiedades de los SE halogenados basados en Zr.

Principales métodos:

  • Preparación mecanoquímica de las SE halogenadas.
  • Espectroscopia de absorción de rayos X (XAS) para el análisis estructural.
  • Análisis de las funciones de distribución de pares (PDF).
  • Modelado inverso de Montecarlo (RMC).
  • Mediciones de la conductividad iónica.

Principales resultados:

  • Los componentes amorfos prevalecen en las SE de haluros sintetizados mecanicamente y están vinculados al transporte rápido de iones de litio.
  • La incorporación de oxígeno en SE halogenados basados en Zr (por ejemplo, Li3ZrCl4O1.5) induce la amorfización, formando poliedros Zr-O/Cl que comparten las esquinas.
  • Esta estructura amorfa única reduce significativamente las barreras de energía de transporte de iones de litio, logrando una conductividad iónica de (1.35 ± 0.07) × 10^-3 S cm^-1 a 25 °C.
  • La amorfización mediante la incorporación de oxígeno también mejora la deformabilidad mecánica y el rendimiento electroquímico.

Conclusiones:

  • La presencia y la química específica local de las fases amorfas son críticas para optimizar la conducción de iones de litio en SE halogenados.
  • La incorporación de oxígeno ofrece una estrategia viable para diseñar SE de haluros amorfos con una mayor conductividad iónica, propiedades mecánicas y rendimiento electroquímico para ASSB.
  • Este estudio proporciona información fundamental para el diseño racional de SE de haluros avanzados para ASSB de alto rendimiento.