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Impact of anion shape on Li solvation and on transport properties for lithium-air batteries: a molecular dynamics study

Fiates, Juliane ; Zhang, Yong ; Franco, Luís F. M ; Maginn, Edward J ; Doubek, Gustavo

Physical chemistry chemical physics : PCCP, 2020-07, Vol.22 (28), p.15842-15852 [Periódico revisado por pares]

Cambridge: Royal Society of Chemistry

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  • Título:
    Impact of anion shape on Li solvation and on transport properties for lithium-air batteries: a molecular dynamics study
  • Autor: Fiates, Juliane ; Zhang, Yong ; Franco, Luís F. M ; Maginn, Edward J ; Doubek, Gustavo
  • Assuntos: Dimethyl sulfoxide ; Dynamic structural analysis ; Energy storage ; Lithium ; Metal air batteries ; Molecular dynamics ; Solvation ; Storage batteries ; Transport properties
  • É parte de: Physical chemistry chemical physics : PCCP, 2020-07, Vol.22 (28), p.15842-15852
  • Notas: 10.1039/d0cp00853b
    Electronic supplementary information (ESI) available. See DOI
    ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
    AC02-06CH11357
    USDOE
  • Descrição: Lithium-air batteries have emerged as an interesting alternative for advanced energy storage devices. The complexity of such systems imposes great challenges. One of them resides in the selection of the lithium salt/solvent pair. Many electrolyte properties affect the operation of the batteries. Among these, the transport properties and structural features have a special place. Via molecular dynamics simulations, we have calculated solution viscosity, ionic diffusivities and conductivities, as well as structural information, for two different salts in dimethyl sulfoxide (DMSO): lithium hexafluorophosphate - LiPF 6 , and lithium pyrrolide - LiPyr, at different temperatures and salt molalities. We show that, despite similar ionic transport properties, Li + solvation in the different salts is significantly different. Therefore, solutions with different solvation properties, which impact the overall battery performance, might present analogous ionic dynamics. Here we report the influence of the anion shape over the solvation structure and transport properties over commonly employed Li-O 2 electrolytes and discuss their implications for the device.
  • Editor: Cambridge: Royal Society of Chemistry
  • Idioma: Inglês
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