Synthesis and characterization of highly conductive Ga/Y co-doped LLZO by facile combustion sol-gel method

Alizadeh, Siavash Mohammad; Moghim, Iman; Golmohammad, Mohammad

doi:10.1016/j.ssi.2023.116260

Cited by 18 publications

(7 citation statements)

References 58 publications

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“…Furthermore, excessive porosity in electrolytes can cause grain boundary resistance [52]. When the heating rate increases for sintering, the degree of insulation and porosity degradation increases, so lithium loss decreases [53]. Consequently, it will prevent the body from producing impurity phases by lowering the amount of lithium that evaporates during the flash sintering process.…”

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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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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“…Li 6.775 Al 0.05 La 3 Zr 1.925 Sb 0.075 O 12 exhibited the highest total conductivity, 4.1 × 10 −4 S/cm at 30 °C. Alizadeh et al [ 112 ] used the dual-doping of LLZ by Ga 3+ and Y 3+ (Li 6.4 Ga 0.2 La 3 Zr 2−x Y x O 12 ). The Li 6.4 Ga 0.2 La 3 Zr 21.7 Y 0.3 O 12 solid electrolyte had the maximum ionic conductivity (1.04 × 10 −3 S/cm 25 °C); such high values of conductivity can be caused by the efficiency of the Ga/Y introduction to promote ceramics sintering.…”

Section: Resultsmentioning

confidence: 99%

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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“…Although the stripping/plating performance of the Li metal anode was not shown, the Li//PI battery exhibited good cycling performance at −70 °C and good performance at low temperatures. However, based on the investigation of the Golmohammad group, the newly fabricated solid-state electrolytes show good stripping/plating performance toward the metallic Li anode under such conditions [ 64 , 65 , 66 ].…”

Section: Anodementioning

confidence: 99%

Challenges and Solutions for Low-Temperature Lithium–Sulfur Batteries: A Review

et al. 2023

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The lithium–sulfur (Li-S) battery is considered to be one of the attractive candidates for breaking the limit of specific energy of lithium-ion batteries and has the potential to conquer the related energy storage market due to its advantages of low-cost, high-energy density, high theoretical specific energy, and environmental friendliness issues. However, the substantial decrease in the performance of Li-S batteries at low temperatures has presented a major barrier to extensive application. To this end, we have introduced the underlying mechanism of Li-S batteries in detail, and further concentrated on the challenges and progress of Li-S batteries working at low temperatures in this review. Additionally, the strategies to improve the low-temperature performance of Li-S batteries have also been summarized from the four perspectives, such as electrolyte, cathode, anode, and diaphragm. This review will provide a critical insight into enhancing the feasibility of Li-S batteries in low-temperature environments and facilitating their commercialization.

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Synthesis and characterization of highly conductive Ga/Y co-doped LLZO by facile combustion sol-gel method

Cited by 18 publications

References 58 publications

Enhanced densification and ionic conductivity of LLZO by flash sintering

Enhanced densification and ionic conductivity of LLZO by flash sintering

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

Challenges and Solutions for Low-Temperature Lithium–Sulfur Batteries: A Review

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