Al-doped Li7La3Zr2O12 garnet-type solid electrolytes for solid-state Li-Ion batteries

Ashuri, Mahnaz; Golmohammad, Mohammad; Mehranjani, Alireza Soleimany; Sani, Mohammadali Faghihi

doi:10.1007/s10854-021-05353-3

Cited by 26 publications

(9 citation statements)

References 54 publications

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“…The dopant content in this study is controlled at 0.125, resulting in the doped LLZO formula of Li 6.625 A 0.125 La 3 Zr 16 O 12 (A = Ga, Al, and Fe). As supported by previous experimental studies, 22–25 c-LLZO doped with Ga, Al, or Fe maintains a consistent and stable cubic phase with such diluted dopant content. We employed first-principles density functional theory (DFT) calculations to identify the most energetically favorable configurations in accordance with the Li distribution principle to minimize the repulsion force 26 and considered two possible doping scenarios: replacing an existing Li atom or occupying an empty tetrahedral (24d) site.…”

Section: Introductionsupporting

confidence: 74%

Dopant-induced modulation of lithium-ion conductivity in cubic garnet solid electrolytes: a first-principles study

Lu¹,

Tian²

2023

Phys. Chem. Chem. Phys.

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Section: Introductionsupporting

confidence: 74%

Dopant-induced modulation of lithium-ion conductivity in cubic garnet solid electrolytes: a first-principles study

Lu¹,

Tian²

2023

Phys. Chem. Chem. Phys.

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“…Consequently, it will prevent the body from producing impurity phases by lowering the amount of lithium that evaporates during the flash sintering process. Other techniques, including conventional sintering, employ higher temperatures, which evaporate more lithium during the sintering process [54].…”

Section: Resultsmentioning

confidence: 99%

Enhanced densification and ionic conductivity of LLZO by flash sintering

Sazvar,

Sarpoolaky,

Golmohammad

2023

Advances in Applied Ceramics: Structural, Functional and Biocer

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Flash sintering arouses the interest since high-density ceramics can be obtained at shorter dwell times and lower temperatures than conventional sintering. In this study, the cubic garnet Li 6.25 Al 0.25 La 3 Zr 2 O 12 (Al-LLZO) was successfully synthesised by the solid-state method. The powders were uniaxially pressed and were subjected to flash sintering at 850°C in a tube furnace under a DC bias using various current densities. It is evidenced that control of the flash electric current is a crucial factor for densification of Al-LLZO. The sample sintered in 50 V cm −1 and 200 mA mm −2 showed a cubic LLZO, 94 ± 0.4% relative density, 0.37 mS cm −1 total ionic conductivity and 0.32 eV activation energy. In addition, it was demonstrated that increasing the current density had a considerable impact on the relative density. This outstanding ionic conductivity might be due to the lower lithium loss and higher density as a result of flash sintering method applied.

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“…Lithium-ion conductivity values of Al-doped solid electrolytes are equal to ~10 −4 S/cm at 25 °C [ 20 , 28 ]. Li 7−3x Al x La 3 Zr 2 O 12 solid electrolytes were obtained by various methods (solid-state reaction, sol–gel, spark plasma sintering, self-consolidation method) and under different final heat-treatment conditions, which have a significant effect on the lithium content in the compound, the stabilization of highly conductive cubic modification, the phase composition and density of ceramic membranes, and, as a result, on the total conductivity of the obtained solid electrolytes [ 20 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 ]. Rangasamy et al [ 36 ] studied the effect of the Li and Al ions concentration on the cubic LLZ formation.…”

Section: Resultsmentioning

confidence: 99%

“…Ga 3+ is another successfully used doping element [ 20 , 47 , 48 , 49 , 50 , 51 , 52 , 53 ]. The effect of Ga-doping on the structure of garnet-type LLZ was investigated using force-field-based simulation [ 49 ].…”

Section: Resultsmentioning

confidence: 99%

“…These elements act as sintering additives; their addition leads to the significant growth of the samples’ relative densities with the annealing temperature increasing; see Figure 3 . Sharifi et al [ 52 ] synthesized Li 7−3x Ga x La 3 Zr 2 O 12 (x = 0.2–0.3) solid electrolytes with cubic structure using the sol–gel method. The solid electrolyte with x = 0.2 exhibited the highest conductivity of 5.85 mS/cm at 20 °C.…”

Section: Resultsmentioning

confidence: 99%

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Recent Strategies for Lithium-Ion Conductivity Improvement in Li7La3Zr2O12 Solid Electrolytes

Il’ina

2023

IJMS

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The development of solid electrolytes with high conductivity is one of the key factors in the creation of new power-generation sources. Lithium-ion solid electrolytes based on Li7La3Zr2O12 (LLZ) with a garnet structure are in great demand for all-solid-state battery production. Li7La3Zr2O12 has two structural modifications: tetragonal (I41/acd) and cubic (Ia3d). A doping strategy is proposed for the stabilization of highly conductive cubic Li7La3Zr2O12. The structure features, density, and microstructure of the ceramic membrane are caused by the doping strategy and synthesis method of the solid electrolyte. The influence of different dopants on the stabilization of the cubic phase and conductivity improvement of solid electrolytes based on Li7La3Zr2O12 is discussed in the presented review. For mono-doping, the highest values of lithium-ion conductivity (~10−3 S/cm at room temperature) are achieved for solid electrolytes with the partial substitution of Li+ by Ga3+, and Zr4+ by Te6+. Moreover, the positive effect of double elements doping on the Zr site in Li7La3Zr2O12 is established. There is an increase in the popularity of dual- and multi-doping on several Li7La3Zr2O12 sublattices. Such a strategy leads not only to lithium-ion conductivity improvement but also to the reduction of annealing temperature and the amount of some high-cost dopant. Al and Ga proved to be effective co-doping elements for the simultaneous substitution in Li/Zr and Li/La sublattices of Li7La3Zr2O12 for improving the lithium-ion conductivity of solid electrolytes.

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Al-doped Li7La3Zr2O12 garnet-type solid electrolytes for solid-state Li-Ion batteries

Cited by 26 publications

References 54 publications

Dopant-induced modulation of lithium-ion conductivity in cubic garnet solid electrolytes: a first-principles study

Dopant-induced modulation of lithium-ion conductivity in cubic garnet solid electrolytes: a first-principles study

Enhanced densification and ionic conductivity of LLZO by flash sintering

Recent Strategies for Lithium-Ion Conductivity Improvement in Li7La3Zr2O12 Solid Electrolytes

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