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Cuantificación espacio-temporal del litio tanto en el electrodo como en el electrolito con precisión atómica a través

Peter-Paul R M L Harks¹, Tomas W Verhallen², Chandramohan George^2,3

¹Materials for Energy Conversion and Storage (MECS), Department of Chemical Engineering , Delft University of Technology , P.O. Box 5045, 2600 GA Delft , The Netherlands.

Journal of the American Chemical Society

|August 27, 2019

Resumen

El perfil de profundidad de neutrones revela cómo se mueven los polisulfuros de litio y están contenidos dentro de las baterías de litio-azufre (Li-S). Esto ayuda a comprender y mejorar el rendimiento y la vida útil de la batería Li-S.

Área de la Ciencia:

Ciencias de los materiales
La electroquímica
Almacenamiento de energía

Sus antecedentes:

Las baterías de litio-azufre (Li-S) ofrecen una alta densidad de energía teórica, pero sufren una vida útil de ciclo pobre.
El deterioro del rendimiento en las baterías Li-S se debe principalmente a la disolución del polisulfuro de litio y al transporte.
La falta de técnicas analíticas in situ dificulta la comprensión de la dinámica del polisulfuro en las células Li-S.

Objetivo del estudio:

Visualizar espacial y temporalmente la distribución del litio (Li) en los electrodos Li-S.
Obtener conocimientos mecanicistas sobre la regulación de los polisulfuros en los componentes de las baterías Li-S.
Para correlacionar el comportamiento del polisulfuro con la capacidad y longevidad de la batería Li-S.

Principales métodos:

Se utilizó el perfil de profundidad de neutrones (NDP) con el isótopo 6Li para el análisis espacial directo de Li.
Investigó tres tipos de electrodos Li-S: carbono-azufre, carbono-azufre con óxido de litio (LTO) y carbono-azufre con una membrana LTO.
Migración, adsorción y confinamiento de polisulfuro dentro de las células Li-S en funcionamiento analizadas.

Principales resultados:

Proporcionó pruebas espaciales directas de migración, adsorción y confinamiento de polisulfuro en electrodos Li-S.
Se ha demostrado la influencia de la composición de los electrodos (adición de LTO, membrana de LTO) en el comportamiento del polisulfuro.
Dinámica del polisulfuro relacionada con la capacidad observada de la batería Li-S y la vida útil del ciclo.

Conclusiones:

NDP es una herramienta poderosa para elucidar los mecanismos de las baterías Li-S.
La comprensión de la regulación de los polisulfuros es crucial para el diseño de baterías Li-S estables y de larga duración.
Los hallazgos guían el diseño racional de electrodos para baterías Li-S de alta energía, seguras y rentables.

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