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Ingeniería de deficiencias de litio en óxido en capas rico en litio Li1.098Mn0.533Ni0.113Co0.138O2 para cátodo de
Pengfei Liu1, Hong Zhang2, Wei He1
1State Key Lab of Physical Chemistry of Solid Surface, Collaborative Innovation Center of Chemistry for Energy Materials, College of Materials , Xiamen University , Xiamen 361005 , China.
Journal of the American Chemical Society
|June 18, 2019
Resumen
La reducción del contenido de litio en los óxidos en capas ricos en litio mejora el rendimiento del cátodo. Este enfoque de deficiencia de litio mejora la cinética, la estabilidad y la capacidad de velocidad de las baterías avanzadas.
Área de la Ciencia:
- Ciencias de los materiales
- La electroquímica
- Almacenamiento de energía
Sus antecedentes:
- Los óxidos en capas ricos en litio ofrecen una alta capacidad específica para aplicaciones de almacenamiento de energía.
- Los desafíos incluyen poca cinética, desintegración de voltaje y desvanecimiento de capacidad en estos materiales.
Objetivo del estudio:
- Para abordar las limitaciones de rendimiento en óxidos en capas ricos en litio utilizando una estrategia de deficiencia de litio.
- Investigar los efectos de las vacantes de litio en las propiedades del material del cátodo.
Principales métodos:
- Sintetizó un material de cátodo con deficiencia de Li: Li1.098Mn0.533Ni0.113Co0.138O2.
- Investigó las propiedades estructurales y electroquímicas del cátodo modificado.
Principales resultados:
- Logró una mejor eficiencia inicial de Coulombic y una excelente capacidad de velocidad.
- Se ha demostrado la supresión del decaimiento de tensión y la estabilidad en ciclos a largo plazo (93,1% de retención después de 500 ciclos a 1 °C).
- Se ha observado un recubrimiento de espineles en la superficie in situ y un dopaje de níquel inducido por vacíos de litio.
Conclusiones:
- El método de deficiencia de litio mejora efectivamente el rendimiento electroquímico de los cátodos de óxido en capas ricos en litio.
- Las vacantes de litio son una estrategia prometedora para el desarrollo de materiales de cátodo de alto rendimiento para baterías.
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