Artículo de revista
Quantum chemical model for lithium electrochemical intercalation into molybdenum disulfide
Date
2003Registration in:
Journal of the Chilean Chemical Society, Volumen 48, Issue 4, 2018, Pages 69-75
07179324
Author
Mendizábal Emaldía, Fernando
Santa Ana, María Angélica
Benavente Espinosa, Eglantina
González Moraga, Guillermo
Institutions
Abstract
Voltage- and incremental charge capacity-composition curves for the electrochemical formation of intercalates LixMoS2 were analyzed at the molecular level by developing a quantum chemical model focused on the variation of the electron chemical potential. Experimentally observed trends of the charge capacity in the range 0<x<0.6 are successfully described by the global hardness index as defined within the density functional theory. Contrasting with classical descriptions like the gas lattice model assuming complete lithium-MoS2 one electron transfer, proposed model leads, agreeing with previous experimental evidence, to a system in which electron density is partially retained in the lithium atom. The model permits moreover to identify a sequence of octahedral and tetrahedral sites as the more favorable migration pathway for the diffusion of lithium through the interlaminar space.