Non-equilibrium microstructure of Li1.4Al0.4Ti1.6(PO4)3 superionic conductor by spark plasma sintering for enhanced ionic conductivity

BaCe0.9−xZrxY0.1O3−δpowders were synthesized by a solid-state reaction. Different contents of cerium and zirconium were studied. Pellets were sintered using either conventional sintering in air at1700∘Cor the Spark Plasma Sintering (SPS) technique. The density of the samples sintered by SPS is much higher than by conventional sintering. Higher values of ionic conductivity were obtained for the SPS sample.

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Dual Substitution and Spark Plasma Sintering to Improve Ionic Conductivity of Garnet Li7La3Zr2O12

Nanomaterials ◽

10.3390/nano9050721 ◽

2019 ◽

Vol 9 (5) ◽

pp. 721 ◽

Cited By ~ 3

Author(s):

Zhencai Dong ◽

Chao Xu ◽

Yongmin Wu ◽

Weiping Tang ◽

Shufeng Song ◽

...

Keyword(s):

Solid State ◽

Ionic Conductivity ◽

Spark Plasma Sintering ◽

Solid Electrolytes ◽

Room Temperature ◽

Ionic Conductivities ◽

Plasma Sintering ◽

Spark Plasma ◽

Total Ionic Conductivity ◽

Ta Doping

Garnet Li7La3Zr2O12 is one of the most promising solid electrolytes used for solid-state lithium batteries. However, low ionic conductivity impedes its application. Herein, we report Ta-doping garnets with compositions of Li7-xLa3Zr2-xTaxO12 (0.1 ≤ x ≤ 0.75) obtained by solid-state reaction and free sintering, which was facilitated by graphene oxide (GO). Furthermore, to optimize Li6.6La3Zr1.6Ta0.4O12, Mg2+ was select as a second dopant. The dual substitution of Ta5+ for Zr4+ and Mg2+ for Li+ with a composition of Li6.5Mg0.05La3Zr1.6Ta0.4O12 showed an enhanced total ionic conductivity of 6.1 × 10−4 S cm−1 at room temperature. Additionally, spark plasma sintering (SPS) was applied to further densify the garnets and enhance their ionic conductivities. Both SPS specimens present higher conductivities than those produced by the conventional free sintering. At room temperature, the highest ionic conductivity of Li6.5Mg0.05La3Zr1.6Ta0.4O12 sintered at 1000 °C is 8.8 × 10−4 S cm−1, and that of Li6.6La3Zr1.6Ta0.4O12 sintered at 1050 °C is 1.18 × 10−3 S cm−1.

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Spark plasma sintering of a commercially available granulated zirconia powder—II. Microstructure after sintering and ionic conductivity

Acta Materialia ◽

10.1016/j.actamat.2008.05.031 ◽

2008 ◽

Vol 56 (17) ◽

pp. 4658-4672 ◽

Cited By ~ 28

Author(s):

G. Bernard-Granger ◽

C. Guizard ◽

S. Surblé ◽

G. Baldinozzi ◽

A. Addad

Keyword(s):

Ionic Conductivity ◽

Spark Plasma Sintering ◽

Zirconia Powder ◽

Plasma Sintering ◽

Spark Plasma

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Fabrication of YSZ/SNDC Bilayer Electrolytes by Spark Plasma Sintering

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.281.748 ◽

2018 ◽

Vol 281 ◽

pp. 748-753

Author(s):

Tian Jun Li ◽

Meng Fei Zhang ◽

Ya Jie Yuan ◽

Xiao Hui Zhao ◽

Wei Pan

Keyword(s):

Ionic Conductivity ◽

Solid Oxide Fuel Cells ◽

Spark Plasma Sintering ◽

Electronic Conductivity ◽

Doped Ceria ◽

X Ray Diffraction ◽

Promising Candidate ◽

Plasma Sintering ◽

Spark Plasma ◽

Bilayer Electrolyte

Doped ceria has been reported as a promising candidate of electrolyte applicable for solid oxide fuel cells (SOFCs) and oxygen sensors due to its high ionic conductivity at intermediate temperature. However, it suffers from certain limitations including the existence of electronic conductivity at reduced atmosphere, which would thus increase the leakage current in cells, and the low fracture strength. In this work, we fabricated a bilayer electrolyte with samarium and neodymium co-doped ceria (SNDC) and yttrium stabilized zirconia (YSZ) using spark plasma sintering (SPS) method, which possess the advantages of two layers, high conductivity of SNDC and good electron blocking ability of YSZ. Both layers of the specimen we obtained were dense and well crystallized according to the scanning electron microscope (SEM) and X-ray diffraction (XRD). The bilayer electrolyte exhibits improved ionic conductivity than YSZ with the value of 1.7 S/cm at 550.

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