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Estructura sensible a la temperatura Evolución de óxidos en capas ricos en litio y manganeso para baterías de iones

Haijun Yu¹, Yeong-Gi So², Yang Ren³

¹College of Materials Science & Engineering, Key Laboratory of Advanced Functional Materials, Ministry of Education , Beijing University of Technology , Pingleyuan #100 , Chaoyang District, Beijing , 100124 , People's Republic of China.

Journal of the American Chemical Society

|October 24, 2018

Resumen

Los cambios estructurales en los cátodos de óxido en capas ricos en litio durante el ciclo de la batería dependen de la temperatura. Comprender esta evolución es clave para diseñar baterías de iones de litio más estables y de alta energía para vehículos eléctricos.

Área de la Ciencia:

Ciencias de los materiales
La electroquímica
Almacenamiento de energía

Sus antecedentes:

Los óxidos en capas ricos en litio son materiales de cátodo prometedores para baterías de iones de litio de alta energía, particularmente para vehículos eléctricos.
Sus complejos mecanismos de reacción y su estabilidad estructural durante el ciclo electroquímico requieren una mayor investigación para su aplicación práctica.

Objetivo del estudio:

Investigar a fondo la evolución estructural de los óxidos en capas ricos en litio-manganeso a diversas temperaturas durante el ciclo electroquímico.
Comprender y diseñar para mejorar la estabilidad estructural de estos materiales catódicos.

Principales métodos:

Ciclo electroquímico de óxidos en capas ricos en litio y manganeso a diferentes temperaturas.
Análisis de los cambios estructurales, incluida la formación de la estructura del núcleo, la extracción de oxígeno, la migración de metales y la agregación superficial.

Principales resultados:

La conversión de la estructura observada en una estructura de núcleo-caparazón (núcleo de LiTMO2 monoclínico distorsionado, caparazón de espinela/sal de roca desordenada).
Extracción de oxígeno en celosía, densificación, migración de metales de transición y agregación superficial identificadas.
Se ha demostrado una sensibilidad significativa a la temperatura de la conversión estructural, acelerándose a temperaturas más altas.

Conclusiones:

Se aclaró el mecanismo de evolución estructural de los óxidos en capas ricos en litio durante el ciclo.
La conversión estructural es altamente dependiente de la temperatura y puede controlarse a través del diseño del material.
Proporciona información para el diseño de materiales de cátodo de alta energía con mayor estabilidad de ciclo para baterías avanzadas.

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