The study of Mg2Si/carbon composites as anode materials for lithium ion batteries

Yan, Jiawei; Huang, Huizhen; Zhang, J.; Yang, Yong

doi:10.1016/j.jpowsour.2007.06.074

Cited by 37 publications

(16 citation statements)

References 34 publications

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“…This is a factor 2.75 higher than for pure Mg 2 Si at the same temperature. Similar effects can be expected from using MgO instead of TiO 2 as a dielectric component in Mg 2 Si, which seems to be easily achievable through magnesiothermic reduction of silica with an excess of magnesium (see equations 2 and 3). This has been shown by Szczech et al [18] who converted diatomaceous earth particles to Mg 2 Si/MgO composite powders via a gas-solid displacement reaction with magnesium vapor.…”

Section: Introductionmentioning

confidence: 58%

“…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%

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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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Section: Introductionmentioning

confidence: 58%

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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“…With cycling, a new peak at 0.25 V starts to develop. Based on the reference data, we suggest that the cathodic peak at 0.02 V is related to the lithiation of Mg [27], while the peaks at 0.16 and 0.20 V are associated with lithium insertion into Mg 2 Si [13]. Finally, the peaks at 0.09, 0.13 and 0.25 V are due to the formation of Li-Si alloys [14,28,29].…”

Section: Differential Capacity Plotsmentioning

confidence: 83%

“…Several studies has been conducted to improve the cyclic stability of Mg-Si system via different methods such as various synthesis techniques which further to the HDR and ball milling also included sputtering [5,8], variations in the Mg-Si composition ratio [8], pre-insertion of Li [9,10], and use of carbon composites/carbon coating [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

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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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Synthesis, Structure Transformation, and Electrochemical Properties of Li₂MgSi as a Novel Anode for Li‐lon Batteries

Liu

et al. 2014

Adv Funct Materials

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In this work, a novel hexagonal Li2MgSi anode is successfully prepared through a hydrogen‐driven chemical reaction technique. Electrochemical tests indicate significantly improved cycling stability for the as‐synthesized Li2MgSi compared with that of Mg2Si. Ball‐milling treatment induces a polymorphic transformation of Li2MgSi from a hexagonal structure to a cubic structure, suggesting that the cubic Li2MgSi is a metastable phase. The post‐24‐h‐milled Li2MgSi delivers a maximum capacity of 807.8 mAh g−1, which is much higher than that of pristine Li2MgSi. In particular, the post‐24‐h‐milled Li2MgSi retains 50% of its capacity after 100 cycles, which is superior to cycling stability of Mg2Si. XRD analyses correlated with CV measurements do not demonstrate the dissociation of metallic Mg and/or Li–Mg alloy involved in the lithiation of Mg2Si for the Li2MgSi anode, which contributes to the improved lithium storage performance of the Li2MgSi anode. The findings presented in this work are very useful for the design and synthesis of novel intermetallic compounds for lithium storage as anode materials of Li‐ion batteries.

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The study of Mg2Si/carbon composites as anode materials for lithium ion batteries

Cited by 37 publications

References 34 publications

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

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

Synthesis, Structure Transformation, and Electrochemical Properties of Li₂MgSi as a Novel Anode for Li‐lon Batteries

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The study of Mg2Si/carbon composites as anode materials for lithium ion batteries

Cited by 37 publications

References 34 publications

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

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

Synthesis, Structure Transformation, and Electrochemical Properties of Li2MgSi as a Novel Anode for Li‐lon Batteries

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Synthesis, Structure Transformation, and Electrochemical Properties of Li₂MgSi as a Novel Anode for Li‐lon Batteries