A5089497486- Advancements in Battery Materials
- Magnetic and transport properties of perovskites and related materials
- Transition Metal Oxide Nanomaterials
- Electronic and Structural Properties of Oxides
- Inorganic Fluorides and Related Compounds
- Advanced Battery Materials and Technologies
- Iron-based superconductors research
- Solidification and crystal growth phenomena
- Molten salt chemistry and electrochemical processes
- 2D Materials and Applications
- Advanced Condensed Matter Physics
University of California, Santa Barbara
2024-2025
University of Utah
2023-2024
Here we demonstrate the floating zone crystal growth of $J_\mathrm{eff}=1/2$ Mott insulator Sr$_2$IrO$_4$. Historically, iridates from a ternary melt has been precluded by extreme vapor pressure metal oxide species and difficulty maintaining correct oxidation state Ir at high temperatures. Here, show that application high-pressure oxygen environment stabilizes Sr$_2$IrO$_4$ phase, leading to first demonstration cm$^{3}$-scale crystals. In contrast conventional SrCl$_2$ flux method, where...
Li-rich cathodes with an O2-type layer stacking offer high gravimetric capacities and fast charge-discharge rates, are structurally more stable respect to transition metal migration than O3-type cathodes....
Transition-metal dichalcogenides (TMDs) have long been attractive to researchers for their diverse properties and high degree of tunability. Most recently, interest in magnetically intercalated TMDs has resurged due potential applications spintronic devices. While certain compositions featuring the absence inversion symmetry such as Fe1/3NbS2 Cr1/3NbS2 garnered most attention, compositional space afforded through host matrix composition well intercalant identity concentration is large...
Of the few weberite-type Na-ion cathodes explored to date, Na2Fe2F7 exhibits best performance, with capacities up 184 mAh/g and energy densities 550 Wh/kg reported for this material. However, development of robust structure-property relationships material is complicated by its tendency form as a mixture metastable polymorphs, transform lower-energy Na y FeF3 perovskite compound during electrochemical cycling. Our first-principles-guided exploration Fe-based weberite solid solutions...
Fast charging remains one of the greatest safety challenges in Li-ion batteries due to Li-dendrite growth occurring on graphite anodes if they are lithiated too quickly. The search for high-rate has highlighted materials Wadsley–Roth (WR) shear phase family. relative abundance V compared with traditional WR compositions Nb and W makes V-based phases attractive. However, high voltage poor reversibility typically associated redox have made V-rich less studied than Nb- W-rich phases. Here, we...