Juhyun’s research is about mathematical modeling of electrochemical impedance spectra (EIS) of porous electrodes. In his first project he revisited the bounded diffusion impedance appearing in modern battery electrodes and studied the effects of nanoparticle geometry and size distribution on the bounded diffusion impedance. The study includes application of the model to a silicon nanowire electrode that has cylindrical particles with distributed radius. It also inspires the inverse application where we can assess configurational status of electrodes using EIS. His second topic is about theoretical calculation of EIS of battery electrodes with anisotropic particles. These days, he is working on modeling of impedance at overlimiting currents through porous media, building on to the group’s specialty. His current interests also include dynamic response of room temperature ionic liquids (RTILs) and inversion of some integral transforms appearing in his models. Juhyun’s recent publications are:
 Song, J. and Bazant, M.Z., 2013. Effects of nanoparticle geometry and size distribution on diffusion impedance of battery electrodes. Journal of The Electrochemical Society, 160 (1), pp.A15-A24.
 Song, J. and Bazant, M.Z., 2014. Electrochemical Impedance of a Battery Electrode with Anisotropic Active Particles. Electrochimica Acta, 131, pp.214-227.