| 초록 |
A promising technology in rechargeable battery systems is lithium metal battery. Lithium metal battery has advantages such as large storage capacity and high efficiency, but Li dendrite which occurs during charging and discharging cycles leads to significant issues such as capacity loss and short circuits. In previous studies, the mechanism of Li dendrite formation was explained through morphological differences at the micro-scale. However, observations at the nano-scale are needed to elucidate the fundamental mechanism of dendrite formation. Herein, we observed the formation of micro-scale Li dendrite and mossy by SEM, and then analyzed the nucleation rate of Li nanoparticles in real time using synchrotron-based grazing incidence small angle X-ray scattering (GISAXS). As a result, it shows that the morphology of Li dendrites is affected by diffusion and kinetic limits at low and high current densities, respectively. According to the experimental results of this study, the formation mechanism discovered at the nano-scale will provide an idea that is based on a new suppression method of dendrite formation. |
