3 years ago

Lithiation Mechanism of Methylated Amorphous Silicon Unveiled by Operando ATR-FTIR Spectroscopy

Lithiation Mechanism of Methylated Amorphous Silicon Unveiled by Operando ATR-FTIR Spectroscopy
Bon Min Koo, Jean-Noël Chazalviel, François Ozanam, Fouad Maroun, Michel Rosso, Daniel Alves Dalla Corte
The lithiation mechanism of methylated amorphous silicon, a-Si1−x(CH3)x:H, with various methyl contents (x = 0 - 0.12) is investigated using operando attenuated total reflection Fourier transform infrared spectroscopy. As in hydrogenated amorphous silicon, a-Si:H, the first lithiation proceeds via a two-phase mechanism. The concentration of the invading Li-rich phase nonmonotonously depends on the methyl content of the active material. This behavior is tentatively explained by two distinct effects: a softening of the material due to a methyl-induced lowering of its reticulation degree and its cohesion, and the presence of nanovoids at high enough methyl content. The first lithiation of a-Si1−x(CH3)x:H is biphasic. Methyl groups lower the material cohesion and at concentrations >5%, induce the formation of nanovoids. It yields a nontrivial dependence of the Li-content of the invading phase as a function of the methyl content of the material.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/aenm.201702568

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