Thermodynamic Optimization of Lithia–Alumina

Kulkarni, Nagraj; Besmann, Theodore M.; Spear, Karl E.

doi:10.1111/j.1551-2916.2008.02753.x

Cited by 26 publications

(9 citation statements)

References 13 publications

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“…According to our study, these areas were also oxygen-rich regions. As seen in Figure 4a and b, EDS maps at a higher resolution showed that the compounds at the grain boundary and in the smaller particles mainly contained [46], a eutectic composition with 23 mol% Al 2 O 3 is formed that has a melting temperature of 1055°C, which is lower than the sintering temperature (i.e., 1100°C) in our study.…”

Section: Morphology and Elemental Analysismentioning

confidence: 42%

Effect of Al2O3 on the sintering of garnet-type Li6.5La3Zr1.5Ta0.5O12

et al. 2016

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It is widely recognized that Al plays a dual role in the fabrication of garnet-type solid electrolytes, i.e., as a dopant that stabilizes the cubic structure and a sintering aid that facilitates the densification. However, the sintering effect of Al 2 O 3 has not been well understood so far because Al is typically "unintentionally" introduced into the sample from the crucible during the fabrication process. In this study, we have investigated the sintering effect of Al on the phase composition, microstructure, and ionic conductivity of Li 6.5 La 3 Zr 1.5 Ta 0.5 O 12 by using an Al-free crucible and intentionally adding various amounts of γ-Al 2 O 3. It was found that the densification of Li 6.5 La 3 Zr 1.5 Ta 0.5 O 12 occurred via liquid-phase sintering, with evidence of morphology change among different compositions. Among all of the compositions, samples with 0.05 mol Al per unit formula of garnet oxide (i.e., 0.3 wt% Al 2 O 3) exhibited the optimal microstructure and the highest total ionic conductivity of 5  10-4 S cm-1 at room temperature.

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Section: Morphology and Elemental Analysismentioning

confidence: 42%

Effect of Al2O3 on the sintering of garnet-type Li6.5La3Zr1.5Ta0.5O12

et al. 2016

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“…Upon heating to 900 °C, the thermodiffraction pattern exhibited the formation of γ-LiAlO 2 (JCPDS 38-1464). The Li 5 AlO 4 decomposed to form γ-LiAlO 2 , which may have occurred via the sublimation of lithium, according to the following reaction : Li 5 AlO 4 ( s ) → 4 Li false( normalg false) + normalO 2 ( g ) + LiAlO 2 ( s ) …”

Section: Resultsmentioning

confidence: 99%

CO₂Chemisorption and Cyclability Analyses of Lithium Aluminate Polymorphs (α- and β-Li₅AlO₄)

Ávalos-Rendón

Lara

Pfeiffer

2012

Ind. Eng. Chem. Res.

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The α- and β-Li5AlO4 polymorphs were synthesized using a solid-state reaction. The polymorphs were then characterized by X-ray diffraction (XRD), X-ray thermodiffraction (XRTD), and N2 adsorption. To determine the CO2 chemisorption capacity, the lithium aluminate polymorphs were analyzed thermogravimetrically in the presence of a CO2 flux. In addition, a cyclability study was performed on these ceramic materials. Although the results appear very similar for the two phases, α-Li5AlO4 exhibits a better CO2 chemisorption performance. The cyclic performance tests indicate that both materials exhibit a gradually reduced chemisorption capacity after multicycle processes. However, even after many cycles, the chemisorption capacity is considerably high in comparison to other lithium ceramics tested as CO2 absorbents.

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“…Figure S1 in Supplementary Information (SI) shows the phase diagram of Al2O3-Li2O optimized by Kulkarni and Besmann. 33 As one can see that these lithium aluminates are stable at wide range of temperatures although with increasing the ratio of Li2O:Al2O3 the melting temperature is decreased. In addition, the Al2O3-Na2O and Al2O3-K2O have similar phase diagrams.…”

Section: Introductionmentioning

confidence: 93%

Electronic structural and lattice thermodynamic properties of MAlO2 and M5AlO4 (M=Li, Na, K) sorbents for CO2 capture applications

Duan

2022

Preprint

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The electronic properties and thermal stabilities of MAlO2 and M5AlO4 (M=Li, Na, K) are investigated by the density functional theory and lattice phonon dynamics. Based on the calculated electronic and lattice thermodynamic properties, their abilities to capture CO2 as solid sorbents are analyzed. The calculated electronic structural properties of MAlO2 and M5AlO4 indicate that all of these alkali aluminates are semiconductors with bandgap range of 2.4~6.4 eV. The 1st valence bands of these alkali aluminates are located in 0~-6 eV under Fermi levels and are mainly contributed by p orbitals of O, s and p orbitals of Al and M. The phonon vibrational frequencies of M5AlO4 spread at lower frequency range compared to their MAlO2 phases. With increasing temperature, the calculated phonon free energies of M5AlO4 decrease faster than their corresponding MAlO2 while their entropies have opposite trends. The reaction 2MAlO2 + CO2 = M2CO3 + Al2O3 has higher reaction heat and Gibbs free energy change than those of corresponding reaction 2/5M5AlO4 + CO2 = M2CO3 + 1/5Al2O3, which shows the former reaction possesses lower turnover temperature. Among these alkali aluminates studied, the β-NaAlO2, lt-KAlO2, and γ-LiAlO2 are better candidates that could be applied for CO2 capture technologies.

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Thermodynamic Optimization of Lithia–Alumina

Cited by 26 publications

References 13 publications

Effect of Al2O3 on the sintering of garnet-type Li6.5La3Zr1.5Ta0.5O12

Effect of Al2O3 on the sintering of garnet-type Li6.5La3Zr1.5Ta0.5O12

CO₂Chemisorption and Cyclability Analyses of Lithium Aluminate Polymorphs (α- and β-Li₅AlO₄)

Electronic structural and lattice thermodynamic properties of MAlO2 and M5AlO4 (M=Li, Na, K) sorbents for CO2 capture applications

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Thermodynamic Optimization of Lithia–Alumina

Cited by 26 publications

References 13 publications

Effect of Al2O3 on the sintering of garnet-type Li6.5La3Zr1.5Ta0.5O12

Effect of Al2O3 on the sintering of garnet-type Li6.5La3Zr1.5Ta0.5O12

CO2Chemisorption and Cyclability Analyses of Lithium Aluminate Polymorphs (α- and β-Li5AlO4)

Electronic structural and lattice thermodynamic properties of MAlO2 and M5AlO4 (M=Li, Na, K) sorbents for CO2 capture applications

Contact Info

Product

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CO₂Chemisorption and Cyclability Analyses of Lithium Aluminate Polymorphs (α- and β-Li₅AlO₄)