Enthalpy of formation of intermetallic compounds from the Li–Si system

Dębski, A.; Gąsior, W.; Góral, A.

doi:10.1016/j.intermet.2012.04.001

Cited by 24 publications

(17 citation statements)

References 17 publications

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“…The following compounds were studied: Li 22 Si 5 (Li 21 Si 5 ), Li 13 Si 4 , Li 7 Si 3 , and Li 12 Si 7 . The authors noted that there still is no common opinion about the composition of the lithium richest silicide [20,[48][49][50]; however, the difference in the lithium content (Li 0.815 Si 0.185 and Li 0.808 Si 0.192 ) is not too strong and the structural parameters are close. In [47], preference was given to the compound Li 22 Si 5 .…”

Section: E MVmentioning

confidence: 99%

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Lithium-silicon alloys: Phase diagram, electrochemical studies, thermodynamic properties, application in chemical power cells

Морачевский

Demidov

2015

Russ J Appl Chem

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Review summarizes and analyzes data on the phase diagram, electrochemical behavior in molten media, and thermodynamic properties of alloys in the lithium-silicon system in the solid and liquid states. The use of Li-Si alloys in medium-temperature chemical power cells and prospects for application of silicon and silicon-containing components as the anode material in lithium-ion batteries are discussed.Lithium is one of the most important metals presently determining the scientifi c-technological progress. The metal itself and its alloys and compounds fi nd use in various industries: light alloys, chemical power cells, nuclear technologies, and nonferrous metallurgy [1][2][3][4][5][6][7][8][9][10][11]. The world's production of lithium steadily grows, data on lithium resources, their geographical distribution, and application fi elds of lithium-containing products as of the year of 2006 can be found in [12]. Silicon is the most widely occurring semiconductor; its annual world's production constitutes thousands of tons and continues to grow. LITHIUM-SILICON ALLOYS in detail by nuclear magnetic resonance (NMR), Raman spectroscopy, and electrical measurements. Based on the results of [28,29], Okamoto included the compound LiSi into the phase diagram of the Li-Si system (Fig. 1) in an additional review [30].It should be noted that studies of the electrochemical behavior of a lithium-silicon electrode in molten media made a major contribution to analyses of the phase diagram of the Li-Si system, its modeling, and calculation of the thermodynamic properties of compounds of lithium with silicon.Lithium-silicon electrode. In [31], the discharge of an electrode of the following composition (wt %): 60Li and 40Si (86 at % Li and 14 at % Si) was studied in a molten LiCl-KCl eutectic mixture in the temperature range 360-440°C. The discharge curve at 40°C, presented in [31], demonstrates four clearly pronounced plateaus, which indicate, with the exception of the fi rst plateau corresponding to the potential of pure lithium, that there are double-phase regions and boundaries of these. According to [31], the following compounds are formed in the Li-Si system: The thermodynamic characteristics of these compounds were also evaluated (see below).Nearly simultaneously, charge and discharge curves were recorded in the above-mentioned study [19] for the lithium-silicon electrode, together with electromotive force measurements for circuit (1). In a slow discharge, the presence of double-phase regions was clearly indicated (407 and 487°C). The electrode behaves reversibly in the LiCl-KCl melt and the values obtained for the plateau potentials can be used for thermodynamic calculations. The same authors [32] carried out an extensive study of how electrodes fabricated from alloys of various compositions in the Li-Si system (Li 2 Si, Li 21 Si 8 , Li 15 Si 4 ) behave in measurements of chargedischarge curves in molten LiCl-KCl, LiF-LiCl-KCl, and LiF-LiCl-LiBr electrolytes in the temperature range 400-480°C. The current density was within the ...

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Section: E MVmentioning

confidence: 99%

“…Prior to making any conclusions, let us consider the enthalpies of formation of the compounds, obtained in [49,50] by direct calorimetric measurements.…”

Section: E MVmentioning

confidence: 99%

Lithium-silicon alloys: Phase diagram, electrochemical studies, thermodynamic properties, application in chemical power cells

Морачевский

Demidov

2015

Russ J Appl Chem

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“…Currently, it includes experimental data on the enthalpy of formation of the intermetallic phases from the Li-Si [2,3], B-Li [4] and Ca-Li [5] systems, the enthalpy of mixing for the Ca-Li system and the measurement results for the electromotive forces in the Li-Si system [6].…”

Section: Entall Databasementioning

confidence: 99%

Entall - Thermodynamic Database of Alloys

Dębski¹

2013

Archives of Metallurgy and Materials

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należą do grupy stopów, mających zastosowania aplikacyjne. Baza Entall zawiera eksperymentalne dane entalpii tworzenia faz międzymetalicznych należących do cytowanych układów oraz oprogramowanie dające możliwość wyliczenia innych funkcji termodynamicznych. Prezentowana baza Entall jest pierwszą propozycją bazy właściwości termodynamicznych, która będzie stopniowo rozbudowywana o nowe układy stopów metali. Jest to baza darmowa i dostępna pod adresem www.entall.imim.pl.

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“…Lithium rich intermetallic compounds could act as an alternative of which lithium silicides appear attractive due to the highest theoretical specific capacity of ~4200 mAh·g -1 (Li 22 Si 5 ) [8,9] and low discharge potentials [10,11]. Furthermore, lithium silicide phases possess rather high reversible hydrogen storage capability and may be used as safe hydrogen storage materials [12,13].…”

Section: Introductionmentioning

confidence: 99%