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Na₃MnZr(PO₄)₃: Un cátodo de alto voltaje para las baterías de sodio

Hongcai Gao¹, Ieuan D Seymour², Sen Xin¹

¹Texas Materials Institute, The University of Texas at Austin , Austin , Texas 78712 , United States.

Journal of the American Chemical Society

|December 4, 2018

Resumen

Las baterías de sodio ofrecen un almacenamiento de energía a gran escala prometedor. El Na3MnZr(PO4)3 estructurado por NASICON demuestra un rendimiento superior como material de cátodo, logrando una alta capacidad y una excelente vida útil para el almacenamiento de energía de iones de sodio.

Área de la Ciencia:

Ciencias de los materiales
La electroquímica
Almacenamiento de energía

Sus antecedentes:

Las baterías de sodio son clave para el almacenamiento de energía a gran escala.
El desarrollo de materiales de cátodo de alto rendimiento es crucial.
Los cátodos de fosfato de manganeso están bajo investigación.

Objetivo del estudio:

Se comunicará el Na3MnZr(PO4)3 estructurado por NASICON como nuevo material de cátodo.
Para evaluar su rendimiento electroquímico para baterías de sodio.
Para entender sus propiedades estructurales y electroquímicas.

Principales métodos:

Pruebas electroquímicas (ciclos de carga y descarga).
El análisis estructural.
Cálculos de la teoría funcional de la densidad (DFT).

Principales resultados:

Na3MnZr ((PO4) 3) exhibe un rendimiento superior en comparación con otros fosfatos de manganeso.
Se alcanzó una alta capacidad de descarga de 105 mAh g-1.
Excelente estabilidad en ciclos con una retención de capacidad del 91% después de 500 ciclos.
Acceso reversible a las parejas redox Mn4+/Mn3+ y Mn3+/Mn2+ a 4,0 y 3,5 V.
Pequeño cambio de volumen durante la sodificación/desodificación.
Se suprime la distorsión de Jahn-Teller del Mn3+.

Conclusiones:

Na3MnZr ((PO4) 3) es un cátodo muy prometedor para las baterías de sodio.
Su estructura facilita una alta densidad de energía y una larga vida útil.
El material ofrece una vía electroquímica estable para la inserción/extracción de iones de sodio.

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