Mechanical alloying of Fe–Si and milling of α- and β-FeSi2 bulk phases

Dézsi, I.; Fetzer, Cs.; Bujdosó, L.; Brötz, Joachim; Balogh, Adam G.

doi:10.1016/j.jallcom.2010.07.178

Cited by 20 publications

(7 citation statements)

References 17 publications

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“…The isomer shift of the resulting powder was measured to be +0.201 mm/s, which is lower than the isomer shift of crystalline α-FeSi 2 . This value is comparable with that found for mechanically milled Fe 0.8 Si 2 reported by Dézsi et al 30 It should be noted that the increased content of FeSi in this sample is expected to increase the isomer shift, since it has been observed that lowering the Fe content in Fe-Si alloys results in an increased isomer shift. 25 Therefore, the decreased isomer shift observed here must be due to changes in the α-FeSi 2 phase and demonstrates that the electron density is higher in ball milled α-FeSi 2 , than its crystalline state.…”

Section: Resultssupporting

confidence: 91%

“…28,29 Reported isomer shift values of α-FeSi 2 are around +0.260 mm/s, based on measurements of either crystalline α-FeSi 2 or thin films. 28,30 These values may not be the same for ball milled alloys. In order to determine the isomer shift of balled milled α-FeSi 2 , crystalline α-FeSi 2 was synthesized by arc-melting a stoichiometric ratio of Fe and Si and the resulting ingot was ground by mortar and pestle into a powder.…”

Section: Resultsmentioning

confidence: 99%

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An Investigation of the Fe-Mn-Si System for Li-Ion Battery Negative Electrodes

Cao

Scott

Dunlap

et al. 2019

J. Electrochem. Soc.

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Fe-Mn-Si alloys prepared by ball milling were investigated as negative electrodes for Li-ion batteries. X-ray diffraction and room temperature 57 Fe Mössbauer measurements were used to characterize alloy structure, which revealed the formation of ternary (Fe,Mn,) 11 Si 19 solid solutions. During cycling in Li cells, the formation of crystalline Li 15 Si 4 was effectively suppressed by inactive transition metal silicide phases, resulting in good cycling performance. In addition, Fe was found to be superior to Mn in avoiding excessive side reactions with electrolyte during cycling.

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Section: Resultssupporting

confidence: 91%

Section: Resultsmentioning

confidence: 99%

An Investigation of the Fe-Mn-Si System for Li-Ion Battery Negative Electrodes

Cao

Scott

Dunlap

et al. 2019

J. Electrochem. Soc.

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“…A SiO 2 concentration of about 23 mol.% in the precursor mixture can thus be estimated. Moreover, freshly reduced metallic Fe is expected to react with Si by mechanical alloying forming FeSi and α-Fe 1−δ Si 2 as already reported in the literature 18,44,45. The formation of the high temperature allotrope of the disilicide upon milling highlights the energetic conditions in the vial during the milling.…”

supporting

confidence: 55%

Magnesioreduction Synthesis of Co-Doped β-FeSi₂: Mechanism, Microstructure, and Improved Thermoelectric Properties

Tonquesse

Verastegui

Huynh

et al. 2019

ACS Appl. Energy Mater.

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β-FeSi 2 and β-Co 0.07 Fe 0.93 Si 2 thermoelectric silicides were synthesized from Fe 2 O 3 and Si powders using a magnesiothermic process. Detailed study of the reaction mechanism by X-ray diraction reveals that liquid Mg is mandatory to initiate the reduction. After completion of the reaction in relatively short time (10 h at 1173 K), the magnesiosynthesized iron disilicides are characterized as powders with grain sizes ranging from 30 to 400 nm and containing a high concentration of stacking faults quantied for 1 Page 1 of 33 ACS Paragon Plus Environment ACS Applied Energy Materials the rst time using a dedicated renement software. The thermoelectric properties of spark plasma sintered pellets with submicrometric grain sizes, high stacking fault density and residual micro-to nanoporosities are presented and compared to corresponding materials synthesized by conventional arc-melting process. Strong thermal conductivity reduction of % at K has been achieved thanks to the mesostructuration induced by the magnesioreduction. It results in an improved maximum gure-of-merit ZT reaching 0.18 at 773 K for β-Co 0.07 Fe 0.93 Si 2 .

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“…Fe–Si alloy powder was produced, wherein Si was nano-crystallized using a mechanical alloying process, and a matrix (iron silicide) was formed through its reaction with Fe. When Si reacts with Li, it is designed such that the matrix can suppress minimized volume expansion [ 26 , 28 , 29 , 30 , 31 ]. Afterwards, comprehensive studies were conducted to evaluate how the electrochemical performance was affected by several factors, such as milling time (milling energy), the grain size of the Si phase, and new matrix (silicide phase) generation due to over-milling [ 20 , 27 , 32 , 33 ].…”

Section: Introductionmentioning

confidence: 99%

Properties of Fe–Si Alloy Anode for Lithium-Ion Battery Synthesized Using Mechanical Milling

Lee

Jeong

Chu³

et al. 2022

Materials

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Silicon (Si)-based anode materials can increase the energy density of lithium (Li)-ion batteries owing to the high weight and volume capacity of Si. However, their electrochemical properties rapidly deteriorate due to large volume changes in the electrode resulting from repeated charging and discharging. In this study, we manufactured structurally stable Fe–Si alloy powders by performing high-energy milling for up to 24 h through the reduction of the Si phase size and the formation of the α-FeSi2 phase. The cause behind the deterioration of the electrochemical properties of the Fe–Si alloy powder produced by over-milling (milling for an increased time) was investigated. The 12 h milled Fe–Si alloy powder showed the best electrochemical properties. Through the microstructural analysis of the Fe–Si alloy powders after the evaluation of half/full coin cells, powder resistance tests, and charge/discharge cycles, it was found that this was due to the low electrical conductivity and durability of β-FeSi2. The findings provide insight into the possible improvements in battery performance through the commercialization of Fe–Si alloy powders produced by over-milling in a mechanical alloying process.

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Mechanical alloying of Fe–Si and milling of α- and β-FeSi2 bulk phases

Cited by 20 publications

References 17 publications

An Investigation of the Fe-Mn-Si System for Li-Ion Battery Negative Electrodes

An Investigation of the Fe-Mn-Si System for Li-Ion Battery Negative Electrodes

Magnesioreduction Synthesis of Co-Doped β-FeSi₂: Mechanism, Microstructure, and Improved Thermoelectric Properties

Properties of Fe–Si Alloy Anode for Lithium-Ion Battery Synthesized Using Mechanical Milling

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Mechanical alloying of Fe–Si and milling of α- and β-FeSi2 bulk phases

Cited by 20 publications

References 17 publications

An Investigation of the Fe-Mn-Si System for Li-Ion Battery Negative Electrodes

An Investigation of the Fe-Mn-Si System for Li-Ion Battery Negative Electrodes

Magnesioreduction Synthesis of Co-Doped β-FeSi2: Mechanism, Microstructure, and Improved Thermoelectric Properties

Properties of Fe–Si Alloy Anode for Lithium-Ion Battery Synthesized Using Mechanical Milling

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Magnesioreduction Synthesis of Co-Doped β-FeSi₂: Mechanism, Microstructure, and Improved Thermoelectric Properties