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Thermal Scanning Conductometry TSC as a General Method for Studying and Controlling the Phase Behavior of Conductive Physical Gels
Published on: January 23, 2018
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In situ marcos orgánicos covalentes gelificados electrolito con esqueletos interconectados de largo alcance para una
Chaoqun Niu1,2, Shu Zhao1,2, Yuxi Xu2
1Zhejiang University, Hangzhou 310027, Zhejiang Province, China.
Journal of the American Chemical Society
|December 19, 2023
Resumen
Desarrollamos un nuevo método para crear electrolitos de gel de COF (CGEs) para un mejor rendimiento de la batería. Estos CGE mejoran el transporte de iones y permiten baterías de metal de litio estables.
Área de la Ciencia:
- Ciencias de los materiales
- La electroquímica
- Química de los polímeros
Sus antecedentes:
- Los marcos orgánicos covalentes (COF) ofrecen nanocanales ordenados ideales para el transporte de iones.
- Existen desafíos en la integración de la síntesis de COF con la fabricación de baterías para obtener electrolitos óptimos.
- Los métodos existentes luchan para crear canales de iones continuos e interfaces de baja impedancia.
Objetivo del estudio:
- Desarrollar un método de gelación in situ para la producción de electrolitos en gel de COF.
- Para integrar la síntesis de COF directamente en el entorno de preparación del electrolito de la batería.
- Mejorar el transporte de iones y las propiedades de la interfaz electroquímica en los electrolitos de la batería.
Principales métodos:
- Se empleó una técnica de gelación in situ para sintetizar electrolitos de gel de COF dentro de electrolitos de carbonato líquido.
- El método utiliza la precoordinación entre sales de litio y bloques de construcción de COF para esqueletos de COF interconectados y cristalinos.
- Se incorporaron grupos de afinidad de litio a los COF para mejorar la conducción iónica.
Principales resultados:
- Los CGEs desarrollados demostraron un aumento de 3 veces en la conductividad iónica (10,5 mS cm-1) en comparación con los electrolitos líquidos.
- La baja energía de activación (0,068 eV) facilitó el transporte eficiente de iones y la deposición de litio sin dendrito durante más de 1800 horas.
- Se logró un rendimiento de velocidad excelente (101 mAh g-1 a 3C) y estabilidad de ciclo en condiciones extremas (158 mAh g-1 en estado plegado).
Conclusiones:
- El método de gelación in situ integra con éxito la síntesis de COF con la preparación de electrolitos de la batería.
- Los CGE resultantes mejoran significativamente la conductividad iónica, la estabilidad y el rendimiento de las baterías de iones de litio.
- La metodología es versátil y aplicable a varios sistemas de baterías de iones metálicos (K, Mg, Zn, Na, Ca).
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