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Evolución estructural en catodos de sal de roca desordenados

Tianyu Li1,2, Tullio S Geraci3,4, Krishna Prasad Koirala5,6

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

Journal of the American Chemical Society
|August 22, 2024
PubMed
Resumen
Este resumen es generado por máquina.

Los óxidos de sal de roca desordenados con exceso de litio (DRX) se transforman en una "fase δ" beneficiosa al calentarse, mejorando la capacidad de la batería de iones de litio. Esta evolución estructural, impulsada por la migración catiónica, es más pronunciada en materiales ricos en manganeso.

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Área de la Ciencia:

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

Sus antecedentes:

  • Los óxidos de sal de roca desordenados con exceso de litio (DRX) son materiales de cátodo rentables para baterías de iones de litio con altas capacidades teóricas.
  • El DRX rico en Mn (Li1+MnM1-O2, y ≥ 0.5) muestra aumentos de capacidad durante el ciclo, vinculados a la formación de una "fase δ" con dominios similares a espineles.

Objetivo del estudio:

  • Investigar sistemáticamente la evolución estructural del DRX basado en Mn al calentarlo en varios estados de deslitización.
  • Comprender los reordenamientos estructurales durante el ciclo de la batería y el mecanismo de formación de la "fase δ".

Principales métodos:

  • Sincrotrón de rayos X y difracción de neutrones para analizar la estructura de la "fase δ".
  • Experimentos de difracción de rayos X con calentamiento in situ.
  • Estudios termoquímicos.

Principales resultados:

  • Todas las estructuras DRX estudiadas se relajan a la "fase δ" al calentarse, lo que lleva a una mejora de la capacidad.
  • La migración selectiva de Li y Mn/Ti dentro de la estructura de DRX causa los reordenamientos estructurales observados.
  • Tanto el DRX rico en Mn como el pobre en Mn pueden relajarse a la "fase δ" después de la deslitización, pero con diferentes estructuras de dominio.

Conclusiones:

  • La formación de la "fase δ" es un mecanismo clave para la mejora de la capacidad en el DRX basado en exceso de Li-Mn.
  • El DRX rico en Mn exhibe una mayor fuerza motriz termodinámica y una menor energía de activación para la relajación de "fase δ", lo que explica su prevalencia durante el ciclo de la batería.