†Department of Energy Science, Sungkyunkwan University, Suwon 440-746, Republic of Korea.
‡Department of Energy Engineering, Hanyang University, Seoul 133-791, Republic of Korea.
ACS Nano. 2015 May 26;9(5):5470-7. doi: 10.1021/acsnano.5b01378. Epub 2015 Apr 16.
To monitor dynamic volume changes of electrode materials during electrochemical lithium storage and removal process is of utmost importance for developing high performance lithium storage materials. We herein report an in operando probing of mesoscopic structural changes in ordered mesoporous electrode materials during cycling with synchrotron-based small angel X-ray scattering (SAXS) technique. In operando SAXS studies combined with electrochemical and other physical characterizations straightforwardly show how porous electrode materials underwent volume changes during the whole process of charge and discharge, with respect to their own reaction mechanism with lithium. This comprehensive information on the pore dynamics as well as volume changes of the electrode materials will not only be critical in further understanding of lithium ion storage reaction mechanism of materials, but also enable the innovative design of high performance nanostructured materials for next generation batteries.
监测电化学锂存储和去除过程中电极材料的动态体积变化对于开发高性能锂存储材料至关重要。在此，我们通过基于同步加速器的小角 X 射线散射 (SAXS) 技术报告了在循环过程中有序介孔电极材料的介观结构变化的实时探测。与电化学和其他物理特性相结合的实时 SAXS 研究直接表明了多孔电极材料在充电和放电的整个过程中如何根据其与锂的反应机制发生体积变化。这种有关电极材料的孔动力学和体积变化的综合信息不仅对于进一步理解材料的锂离子存储反应机制至关重要，而且还能够为下一代电池的高性能纳米结构材料的创新设计提供支持。
