Abstract
Li metal is a promising candidate for negative electrode of next-generation batteries. However, the dendrite growth during cycles is fatal problem for commercialization. It is indispensable to control the morphological variation of Li metal electrode during cycles. Generally, the evaluation of Li metal electrode is performed by coin cells and pouch cells. These cells utilize electrodes with cm-scale. In that case, the reaction distribution sometimes happens to make the analysis difficult. In this study, an ultra-micro-electrode (UME) is utilized as a model electrode in order to discuss the mechanism of electrodeposition and electrochemical dissolution of Li metal. The electrodeposited Li metal onto UME was analyzed by several technique mentioned below. The morphological variation of electrodeposited Li metal was observed by a SEM. 3D structure of the electrodeposited Li metal was observed by cut and see technique of a cryo-FIB-SEM. The nano-scale surface layer of the electrodeposited Li metal was analyzed by a cryo-TEM and STEM-EELS measurement. This presentation will discuss the mechanism of the electrodeposition of Li metal from mm to nm scale based on those measurement.
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