层状插入式电池阴极的电极应变动力学
近日，美国得克萨斯大学奥斯汀分校Yijin Liu团队研究了层状插入式电池阴极的电极应变动力学。相关论文发表在2025年12月18日出版的《科学》杂志上。
基于插层化学的可充电电池电极材料展现出显著的循环稳定性，但其性能仍受化学机械降解的制约。
研究组通过联用多种原位显微技术，探究了电极应变演化过程，并观测到电化学激励下复杂的颗粒团簇重排现象。研究表明，插层正极材料的早期应变积累发生于颗粒间电荷转移与氧化还原反应阶段，其根源在于化学（脱）插层过程与物理晶粒运动之间的异步耦合与解耦。这种相互作用导致非均质氧化还原活性、局部电荷平衡以及多尺度应变级联现象，并通过化学-机械相互作用的异步网络在电极中传递。这些发现共同揭示了集体颗粒动力学与多级应变传递如何主导插层正电极的形变与退化过程。
附：英文原文
Title: Electrode strain dynamics in layered intercalation battery cathodes
Author: Tianxiao Sun, Guannan Qian, Ruqing Fang, Guibin Zan, Zhichen Xue, Stephen E. Trask, Arturo Gutierrez, Wenlong Li, Shimao Deng, Luxi Li, Wenbing Yun, Piero Pianetta, Guihua Yu, Jason R. Croy, William C. Chueh, Juner Zhu, Yijin Liu
Issue&Volume: 2025-12-18
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.
DOI: aea2763
Source: https://www.science.org/doi/10.1126/science.aea2763
