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http://dx.doi.org/10.5229/JKES.2019.22.3.128

Comparison of Characteristics of Electrodeposited Lithium Electrodes Under Various Electroplating Conditions  

Lim, Rana (Department of Chemical Engineering, Dong-A University)
Lee, Minhee (Department of Chemical Engineering, Dong-A University)
Kim, Jeom-Soo (Department of Chemical Engineering, Dong-A University)
Publication Information
Journal of the Korean Electrochemical Society / v.22, no.3, 2019 , pp. 128-137 More about this Journal
Abstract
A lithium is the lightest metal on the earth. It has some attractive characteristics as a negative electrode material such as a low reduction potential (-3.04 V vs. SHE) and a high theoretical capacity ($3,860mAh\;g^{-1}$). Therefore, it has been studied as a next generation anode material for high energy lithium batteries. The thin lithium electrode is required to maximize the efficiency and energy density of the battery, but the physical roll-press method has a limitation in manufacturing thin lithium. In this study, thin lithium electrode was fabricated by electrodeposition under various conditions such as compositions of electrolytes and the current density. Deposited lithium showed strong relationship between process condition and its characteristics. The concentration of electrolyte affects to the shape of deposited lithium particle. As the concentration increases, the shape of particle changes from a sharp edged long one to a rounded lump. The former shape is favorable for suppressing dendrite formation and the elec-trode shows good stripping efficiency of 92.68% (3M LiFSI in DME, $0.4mA\;cm^{-2}$). The shape of deposited particle also affected by the applied current density. When the amount of current applied gets larger the shape changes to the sharp edged long one like the case of the low concentration electrolyte. The combination of salts and solvents, 1.5M LiFSI + 1.5M LiTFSI in DME : DOL [1 : 1 vol%] (Du-Co), was applied to the electrolyte for the lithium deposition. The lithium electrode obtained from this electrolyte composition shows the best stripping efficiency (97.26%) and the stable reversibility. This is presumed to be due to the stability of the surface film induced by the Li-F component and the DOL effect of providing film flexibility.
Keywords
Lithium Metal Battery; High Energy Density; Advanced Anode Material; Electrodeposition; Thin Lithium Electrode;
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