2025-12-18 テキサス大学オースチン校
＜関連情報＞
- https://news.utexas.edu/2025/12/18/batteries-lose-charge-when-they-breathe/
- https://www.science.org/doi/10.1126/science.aea2763
層状インターカレーション電池正極における電極ひずみダイナミクス Electrode strain dynamics in layered intercalation battery cathodes
Tianxiao Sun, Guannan Qian, Ruqing Fang, Guibin Zan, […] , and Yijin Liu
Science Published:18 Dec 2025
DOI:https://doi.org/10.1126/science.aea2763
Editor’s summary
Electrode deformation induced by internal strain accumulation represents a major failure mode in lithium-ion batteries. However, little is known about how local strain forms and evolves during battery operation. Sun et al. explored the strain dynamics in lithium-ion battery cathodes and identified substantial heterogeneity in the states of charge among electrode particles at the onset of operation, which induces local strain. Using optical flow mapping and grain-resolved synchrotron x-ray diffraction, the authors tracked particle behavior and revealed an intriguing coupling between charge transfer and particle motion. A larger out-of-plane deformation compared with the in-plane counterpart was also confirmed to be responsible for electrode wrinkling. —Jack Huang
Abstract
Rechargeable batteries using electrodes based on intercalation chemistry exhibit notable cyclability, yet their performance still suffers from chemomechanical degradation. In this study, by combining a suite of operando microscopy methods, we explored electrode strain evolution and observed intricate particle cluster rearrangement under electrochemical stimuli. We show that early-stage strain accumulation in intercalation cathodes occurs during the period of interparticle charge transfer and redox reactions stemming from asynchronous coupling and decoupling between chemical (de)intercalation and physical grain motion. This interplay drives heterogeneous redox activity, localized charge equilibration, and multiscale strain cascades that propagate through an asynchronous network of chemical-mechanical interactions. Together, these findings reveal how collective particle dynamics and hierarchical strain transmission dictate electrode deformation and degradation in intercalation cathodes.
