About this Abstract |
| Meeting |
MS&T26: Materials Science & Technology
|
| Symposium
|
Energy Materials for Sustainable Development
|
| Presentation Title |
Redox-Driven Defect Engineering in Wadsley-Roth Battery Anode Materials |
| Author(s) |
Roque Santiago, Jessica Lyza, Iva Milisavljevic, Ruby Kavanagh, CJ Sturgill, Morgan Stefik, Scott Misture |
| On-Site Speaker (Planned) |
Roque Santiago |
| Abstract Scope |
Wadsley-Roth (WR) crystallographic shear phases have emerged as promising anode materials for lithium-ion batteries due to their three-dimensional tunnel networks that enable rapid lithium-ion transport. Opportunities remain to further tailor performance through defect engineering. This work investigates defects introduced via coupled reduction and reoxidation treatments and their impact on average crystallographic structure, local and mid-range structure, morphology, and electrochemical behavior. In-situ high-temperature X-ray diffraction (HT-XRD) tracked phase evolution and controlled treatment extent, while in-situ and ex-situ scanning electron microscopy (SEM) captured morphological changes including metal exsolution and surface reconstruction. High-resolution transmission electron microscopy (HR-TEM) revealed atomic-scale structural modifications including variations in shear plane densities and site irregularities consistent with changes in the distribution of local coordination environments observed via pair distribution function (PDF). These changes produced order-of-magnitude variations in lithium diffusivity, providing insight into structure-property relationships in WR materials. |