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La cicatrización por autocalentamiento de las dendritas de litio
Lu Li1, Swastik Basu1, Yiping Wang2
1Department of Mechanical, Aerospace and Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180, USA.
Resumen
Las altas densidades de corriente pueden curar sorprendentemente las dendritas de litio en las baterías recargables. Este mecanismo de autocuración permite el ciclo estable de las baterías de litio-azufre con una eficiencia mejorada.
Área de la Ciencia:
- Ciencias de los materiales
- La electroquímica
- Almacenamiento de energía
Sus antecedentes:
- Los electrodos de metal de litio son cruciales para las baterías recargables de alta densidad energética.
- El crecimiento de dendritas durante el revestimiento de litio / desmontaje causa fallas en la batería y preocupaciones de seguridad.
- Este problema suele empeorar con altas densidades de corriente.
Objetivo del estudio:
- Para investigar un régimen inusual de evolución de la dendrita de litio.
- Explorar el potencial de las altas densidades de corriente para la mitigación de la dendrita.
- Para permitir el ciclo seguro y eficiente de las baterías de litio-azufre.
Principales métodos:
- Investigación experimental del revestimiento y desmontaje con litio a diferentes densidades de corriente.
- Monitoreo de la morfología de las dendritas y la evolución de la superficie.
- Aplicación de tratamientos de alta densidad de corriente a los electrodos metálicos de litio.
- Baterías de litio-azufre con electrodos tratados.
Principales resultados:
- Se identificó un umbral crítico de densidad de corriente (~ 9 mA / cm2) para la autocuración de las dendritas.
- Las altas densidades de corriente inducen el autocalentamiento, promoviendo la migración y curación de la superficie de litio.
- Los tratamientos repetidos de alta densidad de corriente alisaron efectivamente las superficies de litio.
- Se ha demostrado el ciclo seguro de las baterías de litio-azufre con alta eficiencia coulombica.
Conclusiones:
- Las altas densidades de corriente pueden revertir los efectos perjudiciales del crecimiento de la dendrita a través de la autocuración.
- Este nuevo enfoque ofrece una vía para el despliegue de ánodos de metal de litio sin dendrito.
- Permite el desarrollo de baterías recargables más seguras y de alto rendimiento, en particular sistemas de litio-azufre.
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