Estimation of free energies for Li8SiO6 and Li4SiO4 and calculation of the phase diagram of the Li-Si-O system

Migge, H.

doi:10.1016/0022-3115(88)90061-x

Cited by 19 publications

(11 citation statements)

References 6 publications

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“…Crystals were synthesized by programmed cooling from an isochemical melt. As the melt temperature of the orthosilicate is 1528 K (Migge, 1988), the cooling trajectory was initiated with a 2 h hold at 1548 K followed by cooling to 1508 K with a ramp of 0.6 K min-1. Optical inspection of the resulting large transparent and colorless crystals showed polysynthetic twinning for most crystals, as already observed by Tranqui, Shannon, Chen, Iijima & Baur (1979).…”

Section: Methodsmentioning

confidence: 99%

Low-temperature structure of lithium nesosilicate, Li₄SiO₄, and its Li_1s and O_1s X-ray photoelectron spectrum

Jong¹,

Ellerbroek²,

Spek³

1994

Acta Crystallogr Sect B

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Section: Methodsmentioning

confidence: 99%

Low-temperature structure of lithium nesosilicate, Li₄SiO₄, and its Li_1s and O_1s X-ray photoelectron spectrum

Jong¹,

Ellerbroek²,

Spek³

1994

Acta Crystallogr Sect B

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“…However, the diagram for the Li-Si-O system has only been reported at high temperatures above 600 K with the aim of the production of ceramics [54,55], and there has been no report at room temperature. Accordingly, in this section the ternary phase diagram is constructed at 298 K from the reported thermodynamic data of the compounds.…”

Section: Thermodynamic Calculationsmentioning

confidence: 99%

Thermodynamic analysis and effect of crystallinity for silicon monoxide negative electrode for lithium ion batteries

Yasuda

Kashitani²,

Kizaki³

et al. 2016

Journal of Power Sources

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The electrochemical behavior of SiO negative electrodes for lithium ion batteries is thermodynamically and experimentally investigated. The analysis of the reaction pathway and the calculation of the reaction potentials during the Li insertion/extraction reactions are carried out by the construction of the ternary phase diagram for the Li-Si-O system. In the initial reaction of Li insertion, metallic Si and lithium silicates are formed above 0.37 V vs. Li/Li + as a conversion reaction of the SiO negative electrode. Further Li insertion produces Li-Si alloys as reversible reaction phases. The decomposition of the Li 4 SiO 4 phase begins before the formation of the Li-Si alloy is completed. The measured electrode behavior of the SiO negative electrode basically agrees with the thermodynamic calculations, especially at a low reaction rate; deviations can be ascribed to kinetic factors and electrode resistance. The values of over 1898 mA h g −1 and 71.0% were obtained for the discharge capacity and the coulombic efficiency, respectively. Furthermore, the overvoltage for an amorphous SiO electrode was smaller than that for a disproportionated SiO electrode into Si and SiO 2 phases. Highlights-Thermodynamic analysis of SiO electrodes-Highest discharge capacity and relatively high coulombic efficiency for SiO anode-Superior characters of amourphous SiO than disproportionated SiO

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“…Apart from Li 4 SiO 4 , other lithium silicates could be tested as CO 2 captors. Lithium oxosilicate (Li 8 SiO 6 ) [36][37][38][39] has not been fully analyzed in any scientic eld, although it may present interesting properties due to its high Li : Si molar ratio. A few researchers have prepared Li 8 SiO 6 via the solid-state reaction of Li 2 O and SiO 2 , doping it with transition elements and analyzing its crystallographic characteristics.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the CO2 chemisorption reaction mechanism in lithium oxosilicate (Li8SiO6): a new option for high-temperature CO2 capture

2013

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Lithium oxosilicate (Li 8 SiO 6 ) was successfully synthesized via a solid-state reaction. The sample's structure and microstructure were characterized using X-ray diffraction, scanning electron microscopy and N 2 adsorption. The CO 2 chemisorption capacity was evaluated dynamically and isothermally. Li 8 SiO 6 was found to chemisorb CO 2 over a wide temperature range with a maximum weight increase of 52.1 wt%, which corresponds to 11.8 mmol CO 2 per gram ceramic. Using different thermogravimetric analyses with some structural and microstructural analyses, a CO 2 chemisorption mechanism could be proposed, and the chemical species formed (Li 4 SiO 4 , Li 2 SiO 3 and Li 2 CO 3 ) during the CO 2 capture process in Li 8 SiO 6 could be elucidated. The kinetic parameter values (k) obtained for the Li 8 SiO 6 -CO 2 reaction were higher than the k values previously reported for the Li 4 SiO 4 -CO 2 reaction system. Additionally, DH ‡ was found to be 53.1 kJ mol À1 . According to these results, the Li 8 SiO 6 -CO 2 chemisorption mechanism depends on the reaction temperature. Thus, Li 8 SiO 6 may find potential applications as an alternative for CO 2 capture because of its wide temperature range, CO 2 chemisorption capacity and kinetic parameters.

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Estimation of free energies for Li8SiO6 and Li4SiO4 and calculation of the phase diagram of the Li-Si-O system

Cited by 19 publications

References 6 publications

Low-temperature structure of lithium nesosilicate, Li₄SiO₄, and its Li_1s and O_1s X-ray photoelectron spectrum

Low-temperature structure of lithium nesosilicate, Li₄SiO₄, and its Li_1s and O_1s X-ray photoelectron spectrum

Thermodynamic analysis and effect of crystallinity for silicon monoxide negative electrode for lithium ion batteries

Analysis of the CO2 chemisorption reaction mechanism in lithium oxosilicate (Li8SiO6): a new option for high-temperature CO2 capture

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Estimation of free energies for Li8SiO6 and Li4SiO4 and calculation of the phase diagram of the Li-Si-O system

Cited by 19 publications

References 6 publications

Low-temperature structure of lithium nesosilicate, Li4SiO4, and its Li1s and O1s X-ray photoelectron spectrum

Low-temperature structure of lithium nesosilicate, Li4SiO4, and its Li1s and O1s X-ray photoelectron spectrum

Thermodynamic analysis and effect of crystallinity for silicon monoxide negative electrode for lithium ion batteries

Analysis of the CO2 chemisorption reaction mechanism in lithium oxosilicate (Li8SiO6): a new option for high-temperature CO2 capture

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Product

Resources

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Low-temperature structure of lithium nesosilicate, Li₄SiO₄, and its Li_1s and O_1s X-ray photoelectron spectrum

Low-temperature structure of lithium nesosilicate, Li₄SiO₄, and its Li_1s and O_1s X-ray photoelectron spectrum