Abstract
Li metal negative electrode is expected for the next-generation Li battery electrode material, and the control of morphological variation of the Li metal electrode surface is very important issue. In-situ observation of the Li dendrite growth in an ionic liquid by an optical microscope was done in order to discuss the relationship between the Li dendrite growth and the Li+ ionic mass transfer rate. Li dendrite growth in the ionic liquid starts before the surface Li+ ion concentration which is calculated by a simple model become zero. The development of the dendrite length shows the linearity with the square root of time, and this slope has a bending point just after the Li+ ion is depleted. These phenomena mean the Li+ ionic mass transfer rate is also an important parameter for the Li dendrite growth, as well as the surface state of the Li metal electrode.
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