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La estructura y las vías de transporte de litio en los cátodos Li2FeSiO4 para baterías de litio
A Robert Armstrong1, Navaratnarajah Kuganathan, M Saiful Islam
1School of Chemistry, University of St. Andrews, North Haugh, St. Andrews, Fife KY16 9ST, UK.
Journal of the American Chemical Society
|July 12, 2011
Resumen
La exploración de nuevos cátodos de baterías de litio como Li(2)FeSiO(4) es crucial. El modelado por computadora revela que su estructura ciclada se transforma, alterando las rutas de transporte de iones de litio para mejorar el rendimiento de la batería.
Área de la Ciencia:
- Ciencia de los materiales Ciencia de los materiales.
- La electroquímica es electroquímica.
- Química del estado sólido.
Sus antecedentes:
- Li(2)FeSiO(4) es un prometedor material de cátodo de bajo costo para baterías de litio a gran escala.
- Comprender los cambios estructurales durante el ciclo de la batería es esencial para la optimización del material.
Objetivo del estudio:
- Para dilucidar la transformación estructural de Li(2)FeSiO(4) durante el ciclo electroquímico.
- Para caracterizar los cambios en las vías de transporte de iones de litio en el material ciclado.
Principales métodos:
- Análisis de difracción de rayos X de Li(2)FeSiO(4) como preparado y en ciclo.
- Modelado computacional para determinar la estructura atómica y las vías de difusión de iones.
Principales resultados:
- El polimorfo γ(s) preparado como as se transforma en un polimorfo inverso β(II) tras el ciclo.
- Esta transformación implica la inversión de los tetraedros, alterando el enlace catión-oxígeno y la estructura de las capas.
- El modelado por computadora reveló distintas vías de transporte zigzag Li ((+) en la estructura ciclada, que difieren del material preparado como.
Conclusiones:
- La evolución estructural de Li(2)FeSiO(4) tiene un impacto significativo en sus propiedades electroquímicas.
- Los mecanismos identificados de transporte de Li (((+) en el material reciclado proporcionan ideas para el diseño de baterías de litio avanzadas.
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