Department of Chemistry, Southern University of Science and Technology, 518055, Shenzhen, China.
Research Center for Chemical Biology and Omics Analysis, School of Science, Southern University of Science and Technology, 518055, Shenzhen, China.
Chem Asian J. 2022 Nov 16;17(22):e202200824. doi: 10.1002/asia.202200824. Epub 2022 Sep 29.
Dendrites can severely impair zinc battery performance. An in-depth understanding of the dynamic morphology evolution of dendrites with operando approaches is pivotal when addressing these issues. However, in previous studies, the corresponding electrochemical signals are usually ensemble and averaged. It is very challenging to obtain detailed information about the key morphology-performance relationship. Herein, correlated high-resolution operando optical and electrochemical studies of single dendrites on Pt reflective nanopore electrodes are reported. The zinc deposition and dissolution can be directly imaged by a high NA optical microscope, while corresponding galvanic charging and discharging curves are obtained. The correlated information of morphology changes and dynamic overpotential fluctuations under different circumstances unveils the competition between active growth vs. passivation. The isolated zinc formation at the single dendrite level is also evaluated. The methodology can be further extended to elucidate the direct relationship between dendrite evolution and electrochemical responses in various battery systems.
枝晶会严重影响锌电池的性能。在解决这些问题时，深入了解枝晶的动态形态演变并采用原位方法是至关重要的。然而，在以前的研究中，对应的电化学信号通常是整体平均的。因此很难获得有关关键形态-性能关系的详细信息。在此，报道了在 Pt 反射纳米孔电极上的单个枝晶的相关高分辨率原位光学和电化学研究。通过高数值孔径的光学显微镜可以直接对锌的沉积和溶解进行成像，同时获得相应的恒流充放电曲线。在不同情况下，形态变化和动态过电势波动的相关信息揭示了活性生长与钝化之间的竞争。还评估了单个枝晶水平上的孤立锌的形成。该方法可以进一步扩展到阐明各种电池系统中枝晶演化与电化学响应之间的直接关系。
