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Fase de aleación de metal a base de solución sólida para el ánodo de metal de litio altamente reversible

Song Jin1,2, Yadong Ye1,2, Yijie Niu1,3

  • 1Hefei National Laboratory for Physical Sciences at the Microscale, Hefei 230026, China.

Journal of the American Chemical Society
|April 21, 2020
PubMed
Resumen
Este resumen es generado por máquina.

Los investigadores desarrollaron un nuevo ánodo de metal de litio que placa el litio internamente en una lámina de metal. Este diseño libre de dendritas mejora la estabilidad y la seguridad del ciclo de las baterías de alta densidad energética.

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Área de la Ciencia:

  • La electroquímica
  • Ciencias de los materiales
  • Almacenamiento de energía

Sus antecedentes:

  • Las baterías de metal de litio ofrecen una alta densidad de energía, pero sufren de reactividad de ánodo, formación de dendrito y mala estabilidad de ciclo.
  • Las estrategias actuales para mitigar estos problemas a menudo no previenen la deposición en la superficie y las reacciones parasitarias asociadas.
  • El crecimiento de la dendrita en los ánodos metálicos de litio sigue siendo un desafío crítico para la seguridad y el rendimiento de la batería.

Objetivo del estudio:

  • Para demostrar un nuevo mecanismo de recubrimiento de crecimiento hacia el interior para ánodos de metal de litio.
  • Para superar las limitaciones del recubrimiento superficial y la formación de dendritas en las baterías de metal de litio.
  • Mejorar la estabilidad del ciclo y la seguridad de los dispositivos de almacenamiento de energía de alta densidad.

Principales métodos:

  • Utilizando un cambio de fase de aleación basado en solución sólida reversible para impulsar el revestimiento de litio.
  • Lograr el recubrimiento de átomos de litio hacia el interior en una lámina metálica (de decenas de micrómetros de espesor).
  • Investigación de los procesos de litio y delitio que involucran la aleación de solución sólida.

Principales resultados:

  • Se ha demostrado con éxito un revestimiento de litio libre de dendrita a través del crecimiento hacia adentro en una lámina metálica.
  • Se obtiene una eficiencia coulombina mejorada del 99,5 ± 0,2%.
  • Se obtiene una alta capacidad reversible de 1660 mA h g-1 (3.3 mA h cm-2).

Conclusiones:

  • La estrategia de recubrimiento de crecimiento hacia adentro evita efectivamente la deposición superficial y la formación de dendritas.
  • Este método mejora significativamente la estabilidad del ciclo y la seguridad de los ánodos metálicos de litio.
  • El ánodo desarrollado es muy prometedor para la próxima generación de baterías de alta densidad energética.