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Conductores superiónicos mediante conducción interfacial a granel

Chenji Hu1,2, Yanbin Shen2, Ming Shen3

  • 1School of Chemistry and Chemical Engineering, Frontiers Science Center for Transformative Molecules, and in situ Center for Physical Sciences, Shanghai Jiao Tong University, Shanghai 200240, P. R. China.

Journal of the American Chemical Society
|September 28, 2020
PubMed
Resumen
Este resumen es generado por máquina.

Los investigadores desarrollaron nuevos conductores superiónicos de interfaz masiva (BISC) para baterías de estado sólido. Estos materiales utilizan interfaces continuas para la conducción iónica, logrando altas conductividades iónicas y permitiendo el ciclo estable de la batería de metal de litio.

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Área de la Ciencia:

  • Ciencias de los materiales
  • La electroquímica
  • Iónicos de estado sólido

Sus antecedentes:

  • Los conductores superiónicos son cruciales para las baterías de estado sólido (SSB), pero las opciones actuales se limitan a familias estructurales específicas.
  • La conducción interfacial en sistemas compuestos se reconoce como una vía potencial, pero las aplicaciones prácticas siguen sin realizarse.

Objetivo del estudio:

  • Desarrollar una nueva clase de conductores superiónicos basados en mecanismos de conducción interfacial.
  • Demostrar el potencial de estos materiales en aplicaciones de baterías de estado sólido.

Principales métodos:

  • Fabricación a granel de películas finas compuestas con interfaces continuas.
  • Caracterización de la conductividad iónica para los iones de litio, sodio y magnesio BISC.
  • Pruebas de baterías simétricas de litio en estado sólido utilizando BISC de iones de litio.

Principales resultados:

  • Se han logrado conductividades iónicas de 1,16 mS cm-1 (Li+), 0,40 mS cm-1 (Na+), y 0,23 mS cm-1 (Mg2+) a 25 °C.
  • Se ha demostrado una alta conductancia de área, que alcanza hasta 464 mS cm-2 para Li+.
  • Se han observado ciclos de sobrepotencia ultrabajos y estables (> 5000 h) en baterías simétricas de litio.

Conclusiones:

  • Se han introducido conductores superiónicos de interfaz a granel (BISC) como una nueva clase de materiales conductores de iones.
  • Abrió nuevas posibilidades estructurales para los conductores superiónicos más allá de las familias tradicionales.
  • Destacó la necesidad de seguir investigando los mecanismos de conducción y los principios de diseño de los materiales para los BISC.