Mg2Si and MSi2 (M=Ca, Fe) silicon alloys as possible anodes for lithium batteries

Santos-Peña, J.; Brousse, Thierry; Schleich, D. M.

doi:10.1007/bf02375557

Cited by 19 publications

(16 citation statements)

References 9 publications

(11 reference statements)

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“…This gives rise to mechanical stresses that lead to cracks and eventual disintegration of the electrode and a failure of the battery [5]. Intermetallic compounds, such as silicides M-Si (with M: Mg [6][7][8], Mn [2,9], Mo [10], Fe [9,11], Ni [12], Nb, Ta, V, Ca, Cr [13,14], and Ti) [1] were first reported by Anani and Huggins as anode materials for Liion batteries [14], especially Mg 2 Si [6] and CrSi 2 [14]. Since, more work have been performed on silicon and silicon-metal alloys; on this regard, two interesting reviews have recently been published on the subject by Park et al [15] and Larcher et al [2].…”

Section: Introductionmentioning

confidence: 99%

“…Mg 2 Si has an anti-fluorine structure that was shown to accommodate Li-insertion according to the following path: Mg 2 Si + 2Li + 2e → Li 2 MgSi + Mg, followed by reaction of Mg with lithium to form an MgLi alloy [14,16]. However, other groups reported the following reaction pathway [7,8]: Mg 2 Si + 3Li + 3e → 2MgLi + SiLi. Initial capacities are typically usually high but the reversible capacity is quite low.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Investigation of CrSi2 and MoSi2 as anode materials for lithium-ion batteries

Courtel

Duguay

Abu-Lebdeh

et al. 2012

Journal of Power Sources

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigation of CrSi2 and MoSi2 as anode materials for lithium-ion batteries

Courtel

Duguay

Abu-Lebdeh

et al. 2012

Journal of Power Sources

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“…1) [1]. In recent years, it has attracted an increasing amount of interest for a wide range of applications in various fields, such as thermoelectrics and optics and in lithium-ion batteries, largely due to its low toxicity, unique optical and electrical properties, low costs of production, and environmental compatibility [2][3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

From sol–gel prepared porous silica to monolithic porous Mg2Si/MgO composite materials

Hayati-Roodbari

Berger

Bernardi

et al. 2018

J Sol-Gel Sci Technol

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Mg 2 Si is apart from its conductivity properties expected to be a promising candidate for thermoelectric applications due to its low toxicity, low costs, and the high abundance of its precursor chemicals. Through the addition of a homogeneous distribution of nanoparticles (e.g. MgO) and by reducing the size of Mg 2 Si to the nanometer regime, it is possible to decrease the thermal conductivity by increasing phonon-interface scattering and, as a result, improve the thermoelectric properties. However, classical approaches do not allow for the synthesis of nanocomposites from Mg 2 Si and MgO. In this work, a straightforward route is presented towards homogeneously mixed Mg 2 Si/MgO via a two-step magnesiothermic reduction process starting from sol-gel derived hierarchically organized porous silica. Monolithic materials composed of Mg 2 Si and MgO in variable molar ratios are built up from a macroporous network of Mg 2 Si with homogeneously distributed MgO particles exhibiting a crystallite size in the range of 24-37 nm. Highlights •We present a new and versatile method to prepare macroporous Mg 2 Si/MgO composites.• Both components, Mg 2 Si and MgO, are homogeneously distributed in the final composite.• Our approach can easily be extended to other highly porous silica templates.• The Mg 2 Si/MgO network comprises nanosized MgO particles in a 3D interconnected Mg 2 Si network.

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“…Pena et.al [7] have shown that Mg 2 Si delivers a much lower yet quite high initial capacity of about 690 mAh/g. Unfortunately, this value rapidly decreases down to 30 mAh/g already after 25 cycles.…”

Section: Introductionmentioning

confidence: 99%

Nanostructured magnesium silicide Mg2Si and its electrochemical performance as an anode of a lithium ion battery

Nazer

Denys

Andersen

et al. 2017

Journal of Alloys and Compounds

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Nano-crystalline Mg 2 Si (Mg 67 Si 33 ) and its Si-rich eutectic (Mg 47 Si 53 ) composition were synthesized by hydrogen desorption-recombination process, casting and rapid solidification techniques. The synthesis of Mg 2 Si meets experimental challenges due to a significant difference in the melting temperatures of Mg (650 °C) and Si (1414 °C) and due to easy vaporization of magnesium metal. As cast alloys were obtained by induction melting the precursors, Mg and Si, followed by the casting and water quenching. These alloys were rapidly solidified using a chill block melt spinning which produces ribbons with fine dendritic morphology and a grain size close to 100 nm. Hydrogen desorption-recombination process of MgH 2 -Si mixture resulted in a release of ~ 4.67 wt. % H and formation of Mg 2 Si. The microstructure of the alloys has been studied using Scanning Electron Microscopy and the relationship between microstructure and electrochemical properties as anodes of the lithium ion batteries was characterised. The electrochemical tests indicate that Si rich eutectic electrode shows a higher charge-discharge capacity than the Mg 2 Si intermetallic. Rapidly solidified Mg 2 Si and Mg 2 Si + Si alloys showed the highest initial discharge capacities of 989 mAh/g and 1283 mAh/g, respectively, superior to the alloys prepared by hydrogen desorption-recombination process and casting. The presence of electrolyte additives FEC (5 %) and VC (1 %) resulted in the formation of the stable SEI layer and enhanced the cycling capacity of the electrodes. Electrochemical Impedance Spectroscopy (EIS) was used to characterize the anode electrodes on cycling. A mathematical model for accounting the impedance response was utilised. The EIS response showed an increased overall resistance for the Mg 2 Si eutectic Si-containing alloy electrodes when compared to the electrodes based on a stoichiometric Mg 2 Si. Long-term cycling resulted in increased charge transfer resistance, which slowed down the electrochemical processes at the surface of the electrodes.

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Mg2Si and MSi2 (M=Ca, Fe) silicon alloys as possible anodes for lithium batteries

Cited by 19 publications

References 9 publications

Investigation of CrSi2 and MoSi2 as anode materials for lithium-ion batteries

Investigation of CrSi2 and MoSi2 as anode materials for lithium-ion batteries

From sol–gel prepared porous silica to monolithic porous Mg2Si/MgO composite materials

Nanostructured magnesium silicide Mg2Si and its electrochemical performance as an anode of a lithium ion battery

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