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Mejorar la reversibilidad y la cinética de la química aniónica redox en los cátodos de óxido de iones de sodio a
Yao Wang1, Xudong Zhao2, Junteng Jin1
1Beijing Advanced Innovation Center for Materials Genome Engineering, Institute for Advanced Materials and Technology, State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China.
Journal of the American Chemical Society
|October 9, 2023
Resumen
Este estudio revela un mecanismo de acoplamiento reductivo en cátodos de óxido en capas, mejorando el rendimiento de la batería de iones de sodio. Este enfoque estabiliza las reacciones aniónicas redox, mejorando la densidad de energía y la vida del ciclo.
Área de la Ciencia:
- Ciencias de los materiales
- La electroquímica
- Almacenamiento de energía
Sus antecedentes:
- La activación de redox aniónico en óxidos en capas es clave para las baterías de iones de sodio de alta energía.
- El oxígeno redox excesivo conduce a una degradación irreversible del material y a un mal rendimiento de la batería.
Objetivo del estudio:
- Investigar el mecanismo de acoplamiento reductor (RCM) en un nuevo cátodo P2-Na0.8Cu0.22Li0.08Mn0.67O2.
- Mejorar la reversibilidad y la cinética de las reacciones redox aniónicas para mejorar la estabilidad y el rendimiento de las baterías de iones de sodio.
Principales métodos:
- Síntesis y caracterización del material del cátodo P2-Na0.8Cu0.22Li0.08Mn0.67O2.
- Técnicas de caracterización in situ y ex situ para elucidar los mecanismos de reacción.
- Cálculos teóricos para comprender la estructura electrónica y el enlace.
Principales resultados:
- Desentrañó el mecanismo de acoplamiento reductivo que implica la transferencia de electrones de oxígeno a iones de cobre.
- Se ha demostrado una fuerte unión covalente Cu-O-O, suprimiendo la pérdida de oxígeno y la migración de cationes.
- Se obtiene una excelente capacidad de velocidad (134,1 mAh g-1 a 0,1 °C, 63,2 mAh g-1 a 100 °C) y estabilidad de ciclo (82% de retención después de 500 ciclos a 10 °C).
Conclusiones:
- El mecanismo de acoplamiento reductor aumenta efectivamente la reversibilidad y la cinética de las reacciones aniónicas redox.
- Esta estrategia proporciona una nueva vía para el diseño de cátodos de óxido en capas estables y de alto rendimiento para baterías de iones de sodio.
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