About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Powder and Ceramic Materials Science
|
| Presentation Title |
Tunable Grain Boundary Conductivity in Sodium Doped High Entropy Oxides |
| Author(s) |
Justin Cortez, Alexander Dupuy, Hasti Vahidi, Yiheng Xiao, William Bowman, Julie Schoenung |
| On-Site Speaker (Planned) |
Justin Cortez |
| Abstract Scope |
Concerns with the safety and sourcing of lithium-ion batteries have prompted significant research into sodium-based systems. High entropy oxides (HEO), which contain five or more oxide components in equimolar quantities, are ideal for battery applications due to their ability to accommodate a substantial quantity of mobile charge carriers (such as Na), while also demonstrating promising stability, conductivity, and capacity retention. Here we investigate the influence of sodium doping and microstructure on charge transport in bulk sintered (Cu,Co,Mg,Ni,Zn)1-xNaxO. We find that the conductivity increases with increasing dopant amount, up to 1.4x10-5 S×cm-1 at x=0.33. Much of this increase is attributed to the high grain boundary conductivity, which originates from a NaCoO2 layered structure that forms in the grain boundaries during high temperature sintering. The relative contributions of the grain boundaries and the bulk to the charge transport are discussed, along with the ability to engineer grain boundaries in doped HEO materials. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Ceramics, Electronic Materials, Powder Materials |