About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
|
Symposium
|
Advanced Materials for Energy Conversion and Storage 2024
|
Presentation Title |
Designing Cathode Materials that Circumvent Phase Transitions: Insight from Scanning Transmission X-ray Microscopy and Resonant Inelastic X-ray Scattering |
Author(s) |
Justin L. Andrews |
On-Site Speaker (Planned) |
Justin L. Andrews |
Abstract Scope |
Li-ion intercalation in low-dimensional transition metal oxides is often accompanied by significant lattice expansion. The resulting coexistence of multiple lattice-mismatched phases within individual cathode particles has profound implications for the stability and performance of electrode materials. Here I will present our recent collaborative efforts to couple the chemical specificity of X-ray microscopy techniques with data analytics and modeling to provide accurate and quantitative mapping of intraparticle inhomogeneities and stress gradients. We have further leveraged this insight in the design metastable cathode materials with altered geometric and electronic structures that exhibit an increased ability to circumvent phase transitions. Ultimately, this approach has enabled the reversible intercalation of nearly three lithium ions per V2O5. Two-dimensional vanadium L-edge and O K-edge RIXS mapping collected across several metastable polymorphs of V2O5 suggests the importance of vanadium-oxygen hybridization in mitigating irreversible phase transformations in these systems and provides a blueprint for further vanadium-based cathode design. |
Proceedings Inclusion? |
Planned: |