Electrochemical properties of Li–Mg alloy electrodes for lithium batteries

Zhong, Shengwen; Liu, Meilin; Naik, Devang; Gole, James L.

doi:10.1016/s0378-7753(00)00521-8

Cited by 115 publications

(105 citation statements)

References 12 publications

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“…After excluding the contribution from dealloying of Li x Mg (600 mAh g -1 , assuming full reversibility) from the total charge capacity, the remaining 600 mAh g -1 could be attributed to the delithiation of Li 2 S. The observed total capacity during charge proves the reversibility of Mg + Li 2 S. The extraction of lithium occur in two steps one at 0.21 V which is in accordance with the extraction potential of lithium from Li-Mg alloy [32] and the second plateau centered at 0.6 V is due to the formation of MgS from Li 2 S and Mg. The reversibility of magnesium based anode material is known from Mg + LiH system as reported by Tarascon group [21].…”

supporting

confidence: 60%

“…On subsequent cycling, two cathodic and anodic peaks were observed corresponding to the two step lithiation and delithiation process. The cathodic peak at 0.25 V was due to the lithiation of MgS and that observed at 0.005 V was due to the alloying of Li with Mg that is formed during the reduction of MgS [32][33][34]. From previous studies, alloying of Li with Mg is proved to occur below 0.1 V vs Li/Li + in anode materials like pure Mg [33], Mg-Ni Fig .…”

mentioning

confidence: 84%

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Magnesium Sulphide as Anode Material for Lithium-Ion Batteries

Helen

Fichtner

2015

Electrochimica Acta

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supporting

confidence: 60%

mentioning

confidence: 84%

Magnesium Sulphide as Anode Material for Lithium-Ion Batteries

Helen

Fichtner

2015

Electrochimica Acta

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“…Also, much research has focussed on the development of new systems capable of alloying with lithium, namely: Bi [8], Mg [9], Sb [10], Si [11] and Zn [12]. Lead composite materials, in particular, can undergo reversible Li alloying/de-alloying over the potential range of 0.0 Á/1.5 V [13,14].…”

Section: Introductionmentioning

confidence: 99%

Lead-based systems as suitable anode materials for Li-ion batteries

Martos

Morales

Sánchez

2003

Electrochimica Acta

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Three lead-based materials formed by PbO 2 , PbO and Pb as main phases were prepared by following different synthetic procedures and tested as anodic materials in Li-ion batteries by using potentiostatic and galvanostatic methods. While the reduction of Pb(IV) to Pb(II) takes place in a single step, that of Pb(II) to Pb is a complex process involving several steps. Both reduction reactions are irreversible. Lead, whether electrochemically or chemically formed, undergoes an electrochemical reaction with lithium that over the 1.0 Á/0.0 V potential range yields Li x Pb alloys (0 5/x 5/4.4). The anodic and cathodic potentiostatic curves exhibit various signals that account for: (i) the formation of different intermediates with variable lithium contents; (ii) the reversibility of the alloying/de-alloying processes; (iii) the increase in complexity of such processes as the oxidation state of lead in them decreases. This results in capacity fading with cycling, particularly in the samples having Pb as the main component. One way of avoiding the capacity loss on cycling involves depositing the active material on lead sheets from spraying suspensions. These coatings exhibit a good capacity retention, which can be ascribed to the formation of a Li x Pb layer at the active material/substrate interface that facilitates electron and ion transfer across the electrode. #

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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: 84%

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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Electrochemical properties of Li–Mg alloy electrodes for lithium batteries

Cited by 115 publications

References 12 publications

Magnesium Sulphide as Anode Material for Lithium-Ion Batteries

Magnesium Sulphide as Anode Material for Lithium-Ion Batteries

Lead-based systems as suitable anode materials for Li-ion batteries

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

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