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

Bon Min Koo; Daniel Alves Dalla Corte; Jean Noël Chazalviel; Fouad Maroun; Michel Rosso; François Ozanam

doi:10.1002/aenm.201702568

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

Bon Min Koo
, Daniel Alves Dalla Corte
, Jean Noël Chazalviel
, Fouad Maroun
, Michel Rosso
, François Ozanam

Université Paris-Saclay
Collège de France

Résultats de recherche: Contribution à un journal › Article › Revue par des pairs

Résumé

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.

langue originale	Anglais
Numéro d'article	1702568
journal	Advanced Energy Materials
Volume	8
Numéro de publication	13
Les DOIs	https://doi.org/10.1002/aenm.201702568
état	Publié - 4 mai 2018
Modification externe	Oui

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title = "Lithiation Mechanism of Methylated Amorphous Silicon Unveiled by Operando ATR-FTIR Spectroscopy",

abstract = "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.",

keywords = "Li-ion batteries, amorphous silicon, lithiation mechanisms, operando ATR-FTIR, silicon anodes",

author = "Koo, \{Bon Min\} and Corte, \{Daniel Alves Dalla\} and Chazalviel, \{Jean No{\"e}l\} and Fouad Maroun and Michel Rosso and Fran{\c c}ois Ozanam",

note = "Publisher Copyright: {\textcopyright} 2018 WILEY-VCH Verlag GmbH \& Co. KGaA, Weinheim",

year = "2018",

month = may,

day = "4",

doi = "10.1002/aenm.201702568",

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TY - JOUR

T1 - Lithiation Mechanism of Methylated Amorphous Silicon Unveiled by Operando ATR-FTIR Spectroscopy

AU - Koo, Bon Min

AU - Corte, Daniel Alves Dalla

AU - Chazalviel, Jean Noël

AU - Maroun, Fouad

AU - Rosso, Michel

AU - Ozanam, François

PY - 2018/5/4

Y1 - 2018/5/4

N2 - 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.

AB - 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.

KW - Li-ion batteries

KW - amorphous silicon

KW - lithiation mechanisms

KW - operando ATR-FTIR

KW - silicon anodes

UR - https://www.scopus.com/pages/publications/85040776963

U2 - 10.1002/aenm.201702568

DO - 10.1002/aenm.201702568

M3 - Article

AN - SCOPUS:85040776963

SN - 1614-6832

VL - 8

JO - Advanced Energy Materials

JF - Advanced Energy Materials

IS - 13

M1 - 1702568

ER -

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

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