Ulsan National Institute of Science and Technology · 工学
Professor Kyeong-Min Jeong's research lab specializes in advanced energy storage systems, with a focus on lithium-ion batteries and electrode engineering. The lab investigates fundamental electrochemical behaviors such as reaction heterogeneity, electrode curvature effects, and interfacial kinetics in composite electrodes, particularly in silicon–graphite anodes and high-nickel cathodes. They also develop innovative fabrication techniques for thick, dense cathodes and explore real-time imaging and holography for in-situ characterization of electrochemical processes. Their work bridges materials science, electrochemistry, and system-level design to enhance battery performance, stability, and manufacturability.
Figures are computed from collected data and may differ slightly.
Reaction heterogeneity is a crucial factor that influences the design of composite electrodes. Silicon–graphite composites exhibit practical use as anodes, but the complex mechanisms in blended electrodes have not been investigated. Considering mechanisms at an electrode level, intra-/interparticle heterogeneity depending on state-of-charge (SOC) becomes problematic due to their complex kinetic properties. We investigate the complex dynamics of a silicon–graphite blended electrode using side-vie
Dry-processed thick cathodes designed with a porous spherical conductive agent exhibit superior electrochemical performances, even with high areal capacities of up to 20 mA h cm −2 and a high composite density of 3.65 g cm −3 .
Advanced driver assistance system (ADAS) can recognize traffic signals, vehicles, pedestrians, and so on all over the vehicle. However, because the ADAS is based on images taken in an outdoor environment, it is susceptible to ambient weather such as fog. So, preprocessing such as de-fog and de-hazing techniques is required to prevent degradation of object recognition performance due to decreased visibility. But, if such a fog removal technique is applied in an environment where there is little o
• Electrode curvature in cylindrical LIBs affects N/P ratio, causing capacity variations and lithium-metal deposition. • High-nickel cathodes show increased sensitivity to curvature. • Tailored design strategies are proposed to mitigate curvature effects on cell performance. Cylindrical lithium-ion batteries offer several advantages over their flat-body counterparts, including a more robust structure. However, their inherent electrode curvature restricts both electrochemical performance and stab
The time-averaged current distribution over the surface of a rotating-disk electrode is calculated under conditions of periodic current reversal by simultaneously solving the transient-convective-diffusion equation and Laplace's equation. The calculated results compare well with experiments performed using the copper/copper sulfate system. The grid search technique is used to determine the optimum plating conditions in terms of uniform thickness of electrodeposits by varying the duty fa
Speed enhancement of integral imaging based incoherent Fourier hologram capture using a graphic processing unit is reported. Integral imaging based method enables exact hologram capture of real-existing three-dimensional objects under regular incoherent illumination. In our implementation, we apply parallel computation scheme using the graphic processing unit, accelerating the processing speed. Using enhanced speed of hologram capture, we also implement a pseudo real-time hologram capture and op
GPU based acceleration of incoherent Fourier hologram capture technique using integral imaging is reported. Using integral imaging, it is possible to capture hologram of a real-existing three-dimensional object under incoherent illumination. However, signal processing involved in the technique requires heavy computational load, reducing processing speed. The digital reconstruction of a generated hologram at various distances is also computationally expensive. In this report, we use GPU to genera
ABSTRACT Thick electrodes are essential for achieving high‐energy‐density lithium‐ion batteries, yet their performance is often constrained by transport limitations. A central factor is the carbon‐binder domain (CBD), which plays a dual role in electrode. It provides electronic pathways but simultaneously impedes ionic transport. The coexistence of pores between active materials and nanoscale pores within the CBD has previously been recognized, but their individual contributions have not been qu
Understanding the internal microstructure of lithium-ion battery slurries is essential for achieving high-performance electrodes. However, conventional rheological metrics such as viscosity and modulus offer only indirect insight into the electrically active network formed by conductive agents. Here, we present a standardized coin cell-based impedance spectroscopy framework that directly quantifies the internal structure of lithium-ion battery slurries. By applying the distribution of relaxation
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