Methylated silicon: A longer cycle-life material for Li-ion batteries

Touahir, Larbi; Cheriet, A.; Chazalviel, J.‐N.; Villeneuve, Catherine Henry de; Ozanam, F.; Solomon, I.; Keffous, A.; Gabouze, N.; Rosso, Michel

doi:10.1016/j.jpowsour.2013.04.089

Cited by 7 publications

(9 citation statements)

References 26 publications

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“…A galvanostatic curve with potential limitation obtained during the first cycle is presented in Figure 1 . A similar curve is obtained when a‐Si:H is deposited on other substrates . The open circuit potential (OCP) value before the first lithiation is around 2.3 V versus Li/Li + , which is consistent with a silicon electrode free of lithium.…”

Section: Resultssupporting

confidence: 76%

“…[7] Methylated amorphous silicon is a material parented to hydrogenated amorphous silicon (a-Si:H). [7] Methylated amorphous silicon is a material parented to hydrogenated amorphous silicon (a-Si:H).…”

Section: Doi: 101002/aenm201702568mentioning

confidence: 99%

“…Various solutions to this problem were proposed, requiring the use of silicon in nanometric form. Several reviews summarize the recent literature on this subject, We recently showed that a homogeneous amorphous silicon/carbon alloy, in which carbon is inserted as methyl groups (a‐Si 1− x (CH 3 ) x :H), has an improved cyclability, related to its mechanical softening by incorporation of the CH 3 groups . Methylated amorphous silicon is a material parented to hydrogenated amorphous silicon (a‐Si:H).…”

Section: Introductionmentioning

confidence: 99%

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

Koo

Corte

Chazalviel

et al. 2018

Advanced Energy Materials

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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.

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Section: Resultssupporting

confidence: 76%

Section: Doi: 101002/aenm201702568mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Koo

Corte

Chazalviel

et al. 2018

Advanced Energy Materials

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“…Layers of various thicknesses (50-200 nm) were prepared by varying the deposition time. The density of the deposited material is estimated to be 2.26 g cm -3 and 1.93 g cm -3 for a-Si:H and a-Si0.9(CH3)0.1:H, respectively [5].…”

Section: Introductionmentioning

confidence: 99%

“…Besides nanostructuration strategies which offer attracting possibilities for overcoming some of these limitations [2][3][4], another approach is to act on the material itself. Methylated amorphous silicon a-Si1-x(CH3)x:H [5] was shown to better sustain volume variations than standard amorphous silicon, thus improving the electrode cyclability. The origin of this improvement was attributed to 2 two effects of the incorporation of methyl groups in the material: introduction of nano-voids and lowering of the reticulation degree of the silicon network.…”

Section: Introductionmentioning

confidence: 99%

Lithiation of pure and methylated amorphous silicon: Monitoring by operando optical microscopy and ex situ atomic force microscopy

Feng

Ngo

Panagopoulou

et al. 2019

Electrochimica Acta

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Operando color microscopy and ex situ AFM were used to investigate the lithiation process in pure (a-Si:H) and methylated (a-Si1-x(CH3)x:H) amorphous silicon thin layers. Color analysis of optical images allows for monitoring thickness changes of a-Si:H layers. Unlike pure a-Si:H, the first lithiation of a-Si1-x(CH3)x:H is found to be spatially non-uniform: lithiation starts at a limited number of locations then expands radially, forming circular lithiation spots. The morphology of the lithiation spots and their evolution is accurately measured by ex situ AFM. A mechanism is proposed to explain this phenomenon, involving the high resistivity of methylated silicon and the existence of low-resistance point defects.

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Formation mechanism of amorphous silicon nanoparticles with additional counter-flow quenching gas by induction thermal plasma

Zhang

Liu

Tanaka

et al. 2021

Chemical Engineering Science

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Methylated silicon: A longer cycle-life material for Li-ion batteries

Cited by 7 publications

References 26 publications

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

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

Lithiation of pure and methylated amorphous silicon: Monitoring by operando optical microscopy and ex situ atomic force microscopy

Formation mechanism of amorphous silicon nanoparticles with additional counter-flow quenching gas by induction thermal plasma

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