Microstructure and Li‐Ion Conductivity of Hot‐Pressed Cubic Li7La3Zr2O12. Issue 4 (12th January 2015)

• Record Type: Journal Article
• Authors: David, Isabel N.; Thompson, Travis; Wolfenstine, Jeff; Allen, Jan L.; Sakamoto, Jeff; Viyas, B.
• Is Part Of: Journal of the American Ceramic Society. Volume 98:Issue 4(2015)
• Page Start: 1209
• Page End: 1214
• Publication Date: 2015-01-12
• Subjects: Ceramics -- Periodicals; 620.1405
• DOI: 10.1111/jace.13455
• Languages: English
• ISSNs: 0002-7820

Abstract

<abstract abstract-type="main" id="jace13455-abs-0001"> <title> <x xml:space="preserve">Abstract</x> </title> <p>The effect of hot‐pressing temperature on the microstructure and Li‐ion transport of Al‐doped, cubic Li₇La₃Zr₂O₁₂ (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.</p> </abstract>