|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Advanced Materials for Energy Conversion and Storage 2022
||Film Strains Enhance the Reversible Cycling of Intercalation Electrodes
||Delin Zhang, A. Renuka Balakrishna
|On-Site Speaker (Planned)
A key cause of chemo-mechanical degradation in battery electrodes is that they undergo abrupt phase transformation during the charging/discharging cycle. This phase transformation is accompanied by lattice misfit strains that nucleate microcracks, induce fracture, and in extreme cases, amorphizes the electrode. In today's talk, I will show that by engineering suitable film strains in the electrode, we can regulate phase transformation voltages and thus circumvent the chemo-mechanical degradation. We have tested our strategy using a combination of theory and experiment, and we find (for LixV2O5) that tensile film strains lower the voltage for phase transformations to facilitate their reversible cycling across a wider voltage window without chemo-mechanical degradation. These results suggest that film strain engineering is an alternative approach to preventing chemo-mechanical degradation in intercalation electrodes. Beyond thin-film electrodes, our findings are applicable to the study of stress-induced phase transformations in particle-based electrodes and the thin-surface-layers forming on cathode particles.
||Energy Conversion and Storage, Phase Transformations, Thin Films and Interfaces