About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Advanced Materials for Energy Conversion and Storage 2023
|
Presentation Title |
D-6: Lithium-Ion Battery Silicon Anodes: Reducing Mechanical Degradation through Morphological Design |
Author(s) |
Sierra J. Gross, Meng-Ting Hsieh, Ali Mohraz, Daniel R. Mumm, Lorenzo Valdevit |
On-Site Speaker (Planned) |
Sierra J. Gross |
Abstract Scope |
Silicon (Si) anodes for lithium-ion batteries are desirable due to their high theoretical capacity and low working potential. However, Si undergoes large volume variations (~300 vol%) during cycling that can lead to mechanical degradation and loss of active material, resulting in an overall decline in electrochemical performance. Efforts to mitigate this include the use of composites and nanostructures, which decrease active material loading or require complex synthesis routes. Alternatively, bicontinuous porous architectures with conductive backbones and thin coatings of Si have proven promising for balancing power and energy density, while maintaining mechanical integrity. This project uses finite element analysis to study the mechanics of Si layers coated on spinodal, inverse opal, gyroid, and Schwartz primitive nickel backbones during expansion. This presentation will highlight the importance of surface curvature, and show the promise of spinodal structures for alleviating expansion-induced mechanical degradation while also being amenable to scalable synthesis routes. |
Proceedings Inclusion? |
Planned: |
Keywords |
Energy Conversion and Storage, Modeling and Simulation, Mechanical Properties |