About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Energy Materials for Sustainable Development
|
| Presentation Title |
Enhancing Battery Performance through Structural Design of Wadsley-Roth Shear Phases |
| Author(s) |
C.J. Sturgill, Sean Wechsler, Iva Milisavljevic, Md Abdullah Al Muhit, Manish Kumar, Hans-Conrad zur Loye, Christopher Sutton, Scott Misture, Morgan Stefik |
| On-Site Speaker (Planned) |
Scott Misture |
| Abstract Scope |
Wadsley-Roth (WR) niobate shear phases are promising candidates for next-generation, fast-charging, and durable lithium-ion batteries. This study explores performance-enhancing strategies for TiNb2O7 and Nb12WO33 through detailed structural and electrochemical analysis. Advanced characterization techniques, including XRD with Rietveld refinement, XPS, XANES, EXAFS, TEM, and SEM, and others, were used to investigate structure-property relationships before and after extensive in-situ cycling. The results indicated a significant increase in the 10C capacity (233 mAh/g) of TiNb2O7 annealed at 800°C. This improvement was attributed to the complex local atomic and architectural changes that occur during crystallization. For Nb12WO33, the intentional introduction of oxygen defects led to a 1.4X increase in lithium diffusivity and a 27% reduction in cell resistance, significantly improving rate performance. These findings highlight the critical role of atomic-scale features, point defects, and microstructure in enhancing electrochemical behavior, offering insights for the rational design of high-performance battery materials. |