|About this Abstract
|MS&T22: Materials Science & Technology
|Energy Materials for Sustainable Development
|Processing and Characterization of Li7La3Zr0.5Nb0.5Ta0.5Hf0.5O12 High-entropy Li-garnet Electrolyte
|On-Site Speaker (Planned)
We demonstrated the processing of Li7La3Zr0.5Nb0.5Ta0.5Hf0.5O12 high-entropy Li-garnet with promising properties for lithium batteries. We first synthesized the LLZNTH Li-garnet powders which have a single cubic garnet phase without any secondary phases as well as uniform elements distributions. The prepared powders were further densified to a relative density of ~94% with well-crystallized grains and a good contact area with the neighboring grains. Minimal grain growth can be observed in the sintering time range from 8 hours to 20 hours, likely due to high-entropy compounds' sluggish effects. The sample also maintains the cubic garnet phase and uniform elements distribution after sintering. Electrochemical characterizations indicate that the densified sample has an adequate ionic conductivity of 4.67×10-4 S cm-1 at room temperature, a low activation energy of 0.25eV, and a low electronic conductivity in the order of 10-8 S cm-1. Mechanical properties are also studied.