Ryu, Ill
Seoul National University · 材料科学
研究室紹介
Professor Ryu's research lab specializes in advanced materials design for energy storage and mechanical behavior at the nanoscale, with a primary focus on silicon-based anodes for high-performance lithium-ion batteries. The lab investigates the fundamental mechanisms of volume expansion, fracture, and interfacial instability during electrochemical cycling, employing advanced in situ and ex situ characterization techniques such as TEM and SEM. Key research directions include nanostructured silicon architectures (e.g., hollow spheres, yolk–shell, nanopillars), surface oxide effects, and mechanical stabilization strategies to enhance cycle life and rate capability. The lab also explores defect dynamics and mechanical properties in functional materials, including doped tungsten, using multiscale simulations and nanoindentation.
Research Overview
Research Output Trend
Figures are computed from collected data and may differ slightly.
Selected Papers
15Silicon is a promising candidate for the anode material in lithium-ion batteries due to its high theoretical specific capacity. However, volume changes during cycling cause pulverization and capacity fade, and improving cycle life is a major research challenge. Here, we report a novel interconnected Si hollow nanosphere electrode that is capable of accommodating large volume changes without pulverization during cycling. We achieved the high initial discharge capacity of 2725 mAh g(-1) with less
With its high specific capacity, silicon is a promising anode material for high-energy lithium-ion batteries, but volume expansion and fracture during lithium reaction have prevented implementation. Si nanostructures have shown resistance to fracture during cycling, but the critical effects of nanostructure size and native surface oxide on volume expansion and cycling performance are not understood. Here, we use an ex situ transmission electron microscopy technique to observe the same Si nanowir
Si is an attractive negative electrode material for lithium ion batteries due to its high specific capacity (≈3600 mAh g –1 ). However, the huge volume swelling and shrinking during cycling, which mimics a breathing effect at the material/electrode/cell level, leads to several coupled issues including fracture of Si particles, unstable solid electrolyte interphase, and low Coulombic efficiency. In this work, the regulation of the breathing effect is reported by using Si–C yolk–shell nanocomposit
Following an explosion of studies of silicon as a negative electrode for Li-ion batteries, the anomalous volumetric changes and fracture of lithiated single Si particles have attracted significant attention in various fields, including mechanics. However, in real batteries, lithiation occurs simultaneously in clusters of Si in a confined medium. Hence, understanding how the individual Si structures interact during lithiation in a closed space is necessary. Here, we demonstrate physical and mecha