Combustion synthesis of nanocrystalline silicon from silica and magnesium silicide

Cordova, Sergio; Shafirovich, Evgeny

doi:10.1016/j.matchemphys.2020.123288

Cited by 8 publications

(8 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Combining the above XRD results and previous studies, it can be inferred that the reaction between Mg 2 Si and SiO can be divided into two steps of SiO + Mg 2 Si → MgO + Si 29,31 and MgO + SiO → Mg 2 SiO 4 + Si. 32 Since the first step is a violent exothermic reaction, when the n value is small, the heat released during the first step helps to promote the second-step reaction, resulting in the formation of Si and Mg 2 SiO 4 even at a low temperature.…”

Section: Resultssupporting

confidence: 75%

“…Furthermore, the exothermic reaction between Mg 2 Si and SiO triggers a disproportionation reaction of SiO. 29 Interestingly, the product exhibits a novel core−shell structure with uniformly distributed Mg 2 SiO 4 and Si as the shell and disproportionated SiO (d-SiO) as the core, which is named (Mg 2 SiO 4 /Si)@d-SiO (MSO). Mg 2 SiO 4 has a forsterite structure with [SiO 4 ] tetrahedrons and is electrochemically inert.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Mg₂SiO₄/Si-Coated Disproportionated SiO Composite Anodes with High Initial Coulombic Efficiency for Lithium Ion Batteries

Bian

Shi

et al. 2022

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

Silicon monoxide (SiO) is considered as one of the most promising anode material candidates for next-generation high-energy-density lithium ion batteries (LIBs) due to its high specific capacity and relatively lower volume expansion than that of Si. However, a large number of irreversible products are formed during the first charging and discharging process, resulting in a low initial Coulombic efficiency (ICE) of SiO. Herein, we report an economical and convenient method to increase the ICE of SiO without sacrificing its specific capacity by a solid reaction between magnesium silicide (Mg 2 Si) and micron-sized SiO. The reaction product (named MSO) exhibits a unique core−shell structure with uniformly distributed Mg 2 SiO 4 and Si as the shell and disproportionated SiO as the core. MSO exhibits a superior ICE and a high reversible capacity of 81.7% and 1306.1 mAh g −1 , respectively, which can be further increased to 88.7% and 1446.4 mAh g −1 after carbon coating, and improved cyclic stability compared to bare SiO. This work provides a simple yet effective strategy to address the low ICE issue of SiO anode materials to promote the practical application of SiO.

show abstract

Section: Resultssupporting

confidence: 75%

Section: Introductionmentioning

confidence: 99%

Mg₂SiO₄/Si-Coated Disproportionated SiO Composite Anodes with High Initial Coulombic Efficiency for Lithium Ion Batteries

Bian

Shi

et al. 2022

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

show abstract

“…At low Mg vapor pressures and higher temperatures, Mg silicates (MgSiO 4 and Mg 2 SiO 3 ) could form especially in the internal part of SiO 2 (Cordova and Shafirovich, 2020). The formation of Mg silicates is not with high probability and the concentration is usually low.…”

Section: Analysis Of Reaction By-productsmentioning

confidence: 99%

“…Therefore, KI could control the temperature in reaction more precisely and help to reduce the amount of SiC in products for a higher Si yield. MgCl 2 (Cordova and Shafirovich, 2020) and AlCl 3 (Lin et al, 2020) can also be used as heat absorption agents.…”

Section: Influence Of Heat Scavengermentioning

confidence: 99%

Mechanisms and Product Options of Magnesiothermic Reduction of Silica to Silicon for Lithium-Ion Battery Applications

Tan

Jiang

2021

Front. Energy Res.

View full text Add to dashboard Cite

Lithium-ion batteries (LIBs) have been one of the most predominant rechargeable power sources due to their high energy/power density and long cycle life. As one of the most promising candidates for the new generation negative electrode materials in LIBs, silicon has the advantages of high specific capacity, a lithiation potential range close to that of lithium deposition, and rich abundance in the earth’s crust. However, the commercial use of silicon in LIBs is still limited by the short cycle life and poor rate performance due to the severe volume change during Li++ insertion/extraction, as well as the unsatisfactory conduction of electron and Li+ through silicon matrix. Therefore, many efforts have been made to control and stabilize the structures of silicon. Magnesiothermic reduction has been extensively demonstrated as a promising process for making porous silicon with micro- or nanosized structures for better electrochemical performance in LIBs. This article provides a brief but critical overview of magnesiothermic reduction under various conditions in several aspects, including the thermodynamics and mechanism of the reaction, the influences of the precursor and reaction conditions on the dynamics of the reduction, and the interface control and its effect on the morphology as well as the final performance of the silicon. These outcomes will bring about a clearer vision and better understanding on the production of silicon by magnesiothermic reduction for LIBs application.

show abstract

“…Recently, the process has been commonly used to produce nanoporous silicon structures primarily for applications in lithium-ion batteries as silicon anodes, in solar cells, and optoelectronics. [24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42] More recently, magnesiothermic reduction of silica-based minerals such as forsterite (2MgO•SiO 2 ) was proposed as an alternative to carbothermic reduction at industrial levels to produce metallurgical grade silicon. [43] Magnesio-milling reduction of SiO 2 is an alternative method to produce elemental silicon.…”

Section: Sio 2mgmentioning

confidence: 99%

Direct Synthesis of Methyl Chlorosilanes from Pd‐Mg‐SiO₂ Substrates Using Mechanochemistry

Sparschu¹,

Larsen²,

Katsoulis³

2021

Macromol. Rapid Commun.

View full text Add to dashboard Cite

The direct reaction of methyl chloride with magnesium and palladium infused silica substrates to synthesize methyl chlorosilanes is reported. First, high energy ball milling on solid Mg‐SiO2 mixtures produces elemental silicon and MgO. When PdCl2 is infused into the mixture, after additional ball milling and high‐temperature reduction under H2, dipalladium silicide (Pd2Si) is produced. The silicon of the Pd2Si readily reacts with MeCl under Müller–Rochow reaction conditions, to produce methyl chlorosilanes at yield ratios analogous to those of the traditional process. The dominant product is Me2SiCl2 (selectivity > 30%), followed by MeSiCl3 and Me3SiCl, with minor amounts of the remaining chlorosilanes. Silicon conversion exceeds 20% for most of the substrates. The elemental palladium, which remains within the Pd‐Mg‐SiO2 contact mass is re‐converted to Pd2Si at the next H2/high‐temperature treatment and reacts again with MeCl to repeat the methyl chlorosilane production. In principle, the resulting cycle of the mechanochemically induced formation of Pd2Si followed by the reaction with MeCl can be repeated until the starting SiO2 converts completely to methyl chlorosilanes.

show abstract

Combustion synthesis of nanocrystalline silicon from silica and magnesium silicide

Cited by 8 publications

References 36 publications

Mg₂SiO₄/Si-Coated Disproportionated SiO Composite Anodes with High Initial Coulombic Efficiency for Lithium Ion Batteries

Mg₂SiO₄/Si-Coated Disproportionated SiO Composite Anodes with High Initial Coulombic Efficiency for Lithium Ion Batteries

Mechanisms and Product Options of Magnesiothermic Reduction of Silica to Silicon for Lithium-Ion Battery Applications

Direct Synthesis of Methyl Chlorosilanes from Pd‐Mg‐SiO₂ Substrates Using Mechanochemistry

Contact Info

Product

Resources

About

Combustion synthesis of nanocrystalline silicon from silica and magnesium silicide

Cited by 8 publications

References 36 publications

Mg2SiO4/Si-Coated Disproportionated SiO Composite Anodes with High Initial Coulombic Efficiency for Lithium Ion Batteries

Mg2SiO4/Si-Coated Disproportionated SiO Composite Anodes with High Initial Coulombic Efficiency for Lithium Ion Batteries

Mechanisms and Product Options of Magnesiothermic Reduction of Silica to Silicon for Lithium-Ion Battery Applications

Direct Synthesis of Methyl Chlorosilanes from Pd‐Mg‐SiO2 Substrates Using Mechanochemistry

Contact Info

Product

Resources

About

Mg₂SiO₄/Si-Coated Disproportionated SiO Composite Anodes with High Initial Coulombic Efficiency for Lithium Ion Batteries

Mg₂SiO₄/Si-Coated Disproportionated SiO Composite Anodes with High Initial Coulombic Efficiency for Lithium Ion Batteries

Direct Synthesis of Methyl Chlorosilanes from Pd‐Mg‐SiO₂ Substrates Using Mechanochemistry