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Microstructure and Li‐Ion Conductivity of Hot‐Pressed Cubic Li 7 La 3 Zr 2 O 12
Author(s) -
David Isabel N.,
Thompson Travis,
Wolfenstine Jeff,
Allen Jan L.,
Sakamoto Jeff
Publication year - 2015
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.13455
Subject(s) - hot pressing , grain boundary , microstructure , materials science , dielectric spectroscopy , conductivity , ionic conductivity , analytical chemistry (journal) , electrical resistivity and conductivity , grain size , grain growth , relative density , metallurgy , mineralogy , composite material , electrochemistry , chemistry , electrode , chromatography , electrolyte , electrical engineering , engineering
The effect of hot‐pressing temperature on the microstructure and Li‐ion transport of Al‐doped, cubic Li 7 La 3 Zr 2 O 12 ( LLZO ) was investigated. At fixed pressure (62 MPa), the relative density was 86%, 97%, and 99% when hot‐pressing at 900°C, 1000°C, and 1100°C, respectively. Electrochemical impedance spectroscopy showed that the percent grain‐boundary resistance decreased with increasing hot‐pressing temperature. Hot pressing at 1100°C resulted in a total conductivity of 0.37 mS/cm at room temperature where the grain boundaries contributed to 8% of the total resistance; one of the lowest grain‐boundary resistances reported. We believe hot pressing is an appealing technique to minimize grain‐boundary resistance and enable correlations between LLZO composition and bulk ionic conductivity.