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Conductividad iónica rápida en el fosfido-silicato más rico en litio Li14SiP6
Stefan Strangmüller1, Henrik Eickhoff1, David Müller1
1Department of Chemistry , Technische Universität München , Lichtenbergstrasse 4 , D-85747 Garching , Germany.
Journal of the American Chemical Society
|August 13, 2019
Resumen
Los investigadores desarrollaron un nuevo electrolito sólido para baterías de estado sólido. Este material de fosfido-silicato "rico en litio" exhibe una conductividad superiónica, allanando el camino para tecnologías avanzadas de baterías.
Área de la Ciencia:
- Ciencias de los materiales
- Química del estado sólido
- La electroquímica
Sus antecedentes:
- Las baterías de estado sólido requieren electrolitos sólidos con alta conductividad iónica para un almacenamiento de energía seguro y eficiente.
- Los electrolitos sólidos existentes se enfrentan a desafíos para lograr una alta conductividad y estabilidad.
- Los fosfido-trelatos de litio representan una clase prometedora de materiales para electrolitos sólidos.
Objetivo del estudio:
- Para sintetizar y caracterizar un nuevo electrolito sólido de fosfido-silicato "rico en litio".
- Investigar la conductividad iónica y los mecanismos de transporte de iones de litio dentro de este nuevo material.
- Ampliar la familia de fosfido-trelatos de litio para aplicaciones potenciales en baterías.
Principales métodos:
- Síntesis en molino de bolas seguida de tratamiento térmico para obtener el material cristalino.
- Cálculos de difracción de neutrones en polvo dependientes de la temperatura y DFT para analizar las vías de difusión.
- Método de entropía máxima, espectroscopia de impedancia y espectroscopia de RMN 7Li para estudiar la movilidad de iones de litio.
Principales resultados:
- Se sintetizó un nuevo fosfido-silicato cristalino "rico en litio" con vías conductoras en 3D.
- El material exhibe una conductividad superiónica (σ > 10^-3 S cm^-1) a temperatura ambiente con una baja energía de activación (30-32 kJ mol^-1).
- El análisis reveló la difusión de litio a través de huecos tetraédricos y octaédricos, facilitada por la ocupación desordenada de Li / Si.
Conclusiones:
- El fosfido-silicato "rico en litio" desarrollado es un electrolito sólido prometedor para baterías de estado sólido.
- La estructura y la composición del material permiten una alta conductividad y movilidad de iones de litio.
- Este trabajo contribuye al avance de los materiales electrolitos sólidos para el almacenamiento de energía de próxima generación.
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