Lithium metal anodes have the lowest potential (-3.04 V vs. SHE) and highest specific capacity of 3860 mAh g-1 of any metal anodes. [1] However, they still face critical problems, such as lithium dendrites, which may cause internal short circuit, and lithium pulverization. [2] Lithium pulverization increases the surface area of the whole lithium metal anode, which consumes increased amount of electrolytes, forming a solid electrolyte interphase (SEI) which covers these newly exposed Li surfaces. The end result is the depletion of electrolyte and formation of “dead” lithium. [3] The accumulation of the SEI significantly increases the cell impedance and a sudden voltage polarization is seen at the end of Li metal cycling. [4] Fundamentally, the uneven Li deposition is related to the diffusion process of Li+ in the electrolyte. An electrochemical tool has been developed by using lab-made micro-electrodes to measure critical kinetic parameters such as diffusion coefficients, limited current densities, and the onset voltages of the diffusion-controlled region in different electrolytes. The morphologies of electrochemically plated Li, on the surface of these micro-electrodes, in various electrolytes, are also compared and correlated to the measured kinetic parameters. An effective electrochemical method has been built to quickly screen compatible electrolytes providing new insights for understanding the mass-transport controlled Li plating process. Reference: 1) Xu, W., Wang, J., Ding, F., Chen, X., Nasybulin, E., Zhang, Y. and Zhang, J.G., 2014. Lithium metal anodes for rechargeable batteries. Energy & Environmental Science, 7(2), pp.513-537. 2) Wu, B., Lochala, J., Taverne, T. and Xiao, J., 2017. The interplay between solid electrolyte interface (SEI) and dendritic lithium growth. Nano Energy, 40, pp.34-41. 3) Zhang, S.S., 2018. Problem, status, and possible solutions for lithium metal anode of rechargeable batteries. ACS Applied Energy Materials, 1(3), pp.910-920. 4) Lu, D., Shao, Y., Lozano, T., Bennett, W.D., Graff, G.L., Polzin, B., Zhang, J., Engelhard, M.H., Saenz, N.T., Henderson, W.A. and Bhattacharya, P., 2015. Failure mechanism for fast‐charged lithium metal batteries with liquid electrolytes. Advanced Energy Materials, 5(3), p.1400993.