Microstructure and Li‐Ion Conductivity of Hot‐Pressed Cubic Li7La3Zr2O12
Abstract
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.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jan 12, 2015
- Source ID
- 10.1111/jace.13455
Entities
People
- Isabel N. David
- Jan L Allen
- Jeff Sakamoto
- Jeff Wolfenstine
- Travis Thompson
Organizations
- Army Research Office
- Michigan State University
- United States Army Research Laboratory