Department of Chemistry, Bar-Ilan University, Ramat-Gan 52900, Israel.
School of Chemistry, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel-Aviv University, Ramat Aviv 69978, Israel.
Nat Mater. 2016 May;15(5):570-5. doi: 10.1038/nmat4577. Epub 2016 Feb 29.
A primary atomic-scale effect accompanying Li-ion insertion into rechargeable battery electrodes is a significant intercalation-induced change of the unit cell volume of the crystalline material. This generates a variety of secondary multiscale dimensional changes and causes a deterioration in the energy storage performance stability. Although traditional in situ height-sensing techniques (atomic force microscopy or electrochemical dilatometry) are able to sense electrode thickness changes at a nanometre scale, they are much less informative concerning intercalation-induced changes of the porous electrode structure at a mesoscopic scale. Based on a electrochemical quartz-crystal microbalance with dissipation monitoring on multiple overtone orders, herein we introduce an in situ hydrodynamic spectroscopic method for porous electrode structure characterization. This new method will enable future developments and applications in the fields of battery and supercapacitor research, especially for diagnostics of viscoelastic properties of binders for composite electrodes and probing the micromechanical stability of their internal electrode porous structure and interfaces.
锂离子嵌入可充电电池电极伴随的一个主要原子尺度效应是晶态材料的单元胞体积发生显著的嵌入诱导变化。这会产生各种二次多尺度维度变化，并导致储能性能稳定性恶化。尽管传统的原位测高技术（原子力显微镜或电化学膨胀计）能够在纳米尺度上感知电极厚度变化，但它们在介观尺度上对嵌入诱导的多孔电极结构变化的信息量要少得多。基于电化学石英晶体微天平（EQCM）在多个泛音阶的耗散监测，我们在此引入一种用于多孔电极结构表征的原位流体动力光谱学方法。这种新方法将为电池和超级电容器研究领域的未来发展和应用提供支持，特别是在复合电极的粘合剂的粘弹性性质的诊断以及探测其内部电极多孔结构和界面的微机械稳定性方面。
