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Kim, Youngsik
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  • Ionic conducting ceramic electrolyte membranes, energy conversion and storage materials and devices

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Characterization of hot-pressed von Alpen type NASICON ceramic electrolytes

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Title
Characterization of hot-pressed von Alpen type NASICON ceramic electrolytes
Author
Valle, Joseph M.Huang, ClaireTatke, DhruvWolfenstine, JeffreyGo, WooseokKim, YoungsikSakamoto, Jeff
Issue Date
2021-10
Publisher
ELSEVIER
Citation
SOLID STATE IONICS, v.369, pp.115712
Abstract
The Na-ion conducting solid electrolyte NASICON is a promising solid state electrolyte (SSE) for use in Na based electrochemical systems. The effects of particle morphology and synthesis of von Alpen type NASICON via hotpressing were investigated. Spray dried particles were shown to improve mechanical and electrochemical properties. X-ray diffraction, scanning electron microscopy, impulse excitation measurements, Vickers hardness, and impedance spectroscopy were used to correlate relationships between phase purity, microstructure, mechanical properties, and electrochemical properties. Scanning electron microscopy showed the presence of a glass phase as between 19.08% and 28.23% area percentage and a ZrO2 phase between 0.46% and 3.51% area percentage in the hot-pressed samples. Impulse excitation showed elastic modulus varying from 83.65 to 97.65 GPa. The first values of Poisson's ratio and shear modulus of NASICON are reported as between 0.23 and 0.26 and 33.87 to 38.79 GPa, respectively. Vickers hardness and fracture toughness measurements showed Vickers hardness ranging from 4.30 to 4.68 GPa and fracture toughness ranging from 1.05 to 1.09 MPa m(1/2). Impedance spectroscopy showed grain conductivities ranging from 1.023 to 1.287 mS/cm, with grain boundary resistance percentages between 73.22 and 47.5%. Total conductivities ranged from 0.292 to 0.596 mS/cm, with 0.596 mS/cm being achieved at room temperature for the spray dried powders with lower grain boundary resistance percentages.
URI
https://scholarworks.unist.ac.kr/handle/201301/53948
URL
https://www.sciencedirect.com/science/article/pii/S016727382100165X?via%3Dihub
DOI
10.1016/j.ssi.2021.115712
ISSN
0167-2738
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