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Desacoplamiento de la estructura de conducción y solvación de iones de litio en electrolitos eutécticos profundos

Shida Xue1, Xiangming Yao1, Zhikang Deng2

  • 1School of Advanced Materials, Peking University Shenzhen Graduate School, Shenzhen 518055, China.

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Resumen

Este estudio mejora los electrolitos cuasi sólidos eutecticos profundos (DES) para baterías de iones de litio mediante la estabilización de las interfaces y la mejora de la conductividad. Una nueva estrategia equilibra la conductividad iónica y la estabilidad interfacial para el rendimiento de la batería de alto voltaje.

Palabras clave:
Electrolitos eutécticos profundosEl dimetil sulfónEstabilidad de la interfazConducción de iones de litioElectrolitos casi sólidos

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Área de la Ciencia:

  • Ciencias de los materiales
  • La electroquímica
  • Tecnología de baterías

Sus antecedentes:

  • Los electrolitos cuasi sólidos eutecticos profundos (DES) basados en dimetilsulfona (DMS) son prometedores para las baterías de iones de litio, pero sufren de inestabilidad interfacial.
  • Los métodos actuales para mejorar la estabilidad mediante la alteración de las vainas de solvación a menudo reducen la conductividad iónica, lo que dificulta el rendimiento de la batería.

Objetivo del estudio:

  • Desarrollar una estrategia que desacople la conducción de Li+ de la estructura de coordinación en DES para mejorar el rendimiento de la batería.
  • Para mejorar la estabilidad interfacial y la conductividad iónica simultáneamente en baterías de iones de litio de alto voltaje.

Principales métodos:

  • Incorporación de borato de difluoroalato de litio (LiDFOB) para crear una cubierta de solvación rica en aniones Li+ y promover las interfasas estables.
  • Integración de marcos de fluoruro de polivinileno (PVDF) para regular la coordinación local y establecer canales rápidos de transporte de Li+.

Principales resultados:

  • Logró una mejor conductividad iónica, permitiendo el funcionamiento a alta velocidad de las baterías de iones de litio.
  • Se garantiza la formación de interfasas estables tanto en los cátodos de LiCoO2 de 4,6 V como en los ánodos de grafito.
  • Se ha demostrado una estabilidad de funcionamiento excepcional en alta tensión para DES.

Conclusiones:

  • La estrategia de regulación jerárquica equilibra con éxito la conductividad y la estabilidad interfacial en DES.
  • Este enfoque ofrece ideas importantes para la aplicación práctica de DES en baterías de iones de litio de alto voltaje.