https://scholar.dgist.ac.kr/handle/20.500.11750/6312 Sat, 04 Apr 2026 17:14:38 GMT 2026-04-04T17:14:38Z https://scholar.dgist.ac.kr/handle/20.500.11750/60117 Title: Digital Twin-Driven Mechanical Degradation Diagnostics: Unraveling Microstructure Evolution of Silicon-based Lithium-Ion Battery Anodes Author(s): Lim, Jaejin; Choi, Junhyeok; Kim, Kyung-Geun; Song, Jihun; Lee, Hyobin; Lee, Yong Min Abstract: Silicon is a promising anode material due to its high theoretical capacity, but its extreme volume change (>300%) during cycling leads to contact loss, electrode delamination, and crack propagation, ultimately compromising mechanical integrity. While operando imaging captures morphological evolution, it remains insufficient to resolve the coupled electrochemical, mechanical, and microstructural dynamics that govern degradation. Here, a microstructure-resolved digital twin model of SiOx/graphite composite electrodes is presented to diagnose electrochemo-mechanical behavior. A 3D structure reconstructed from high-resolution FIB-SEM tomography is integrated into a coupled simulation framework that captures Li+ diffusion, interfacial electrochemical reactions, and concentration-dependent mechanical strain. Simulations reveal that volumetric expansion distorts internal conduction pathways-enhancing electronic conduction via broadened solid-solid interfaces while impeding ion transport through increased tortuosity. Moreover, charge-rate-dependent analysis shows that the charging rate governs the balance between the state of charge (SoC) and local stress. Increasing the rate from 0.5C to 4C reduces stress by limiting the SoC level, thereby mitigating mechanical degradation and enhancing cycling stability. This digital twin framework enables quantitative diagnostics of stress-driven failure and offers design guidelines for the development of mechanically robust, high-performance silicon-based anodes. Wed, 31 Dec 2025 15:00:00 GMT https://scholar.dgist.ac.kr/handle/20.500.11750/60117 2025-12-31T15:00:00Z https://scholar.dgist.ac.kr/handle/20.500.11750/60113 Title: Impact of Conductive Agents in Sulfide Electrolyte Coating on Cathode Active Materials for Composite Electrodes in All-Solid-State Batteries Author(s): Kim, Dongyoung; Lee, Jongjun; Choi, Seungyeop; Song, Myunggeun; Lee, Hyobin; Lee, Yong Min Abstract: All-solid-state batteries (ASSBs) with sulfide-based solid electrolytes (SEs) are promising next-generation lithium-ion batteries owing to their high energy density and safety. The composite electrode is crucial in electrochemical performance, and SE coating on the cathode active material (CAM) is an effective strategy for improving the composite electrode structure. However, despite the importance of conducting agents (CAs) in composite electrodes, their impact on the SE coating process has not been thoroughly investigated. Here, the effect of CA incorporation during the SE coating process on the morphology of the coating layer, composite electrode structure, and resulting electrochemical performance of ASSBs were examined. When the SE coating excluded CA (SE@CAM), a dense SE layer was formed on the CAM surface. By contrast, incorporating carbon black (Super P) during SE coating (SE–SP@CAM) resulted in a Super P-rich SE coating layer, reducing the active surface area and electrical conductivity of electrode and resulting in poor electrochemical performance. Meanwhile, incorporating vapor-grown carbon fibers (VGCF, 1D CA) during the SE coating process (SE–VGCF@CAM) resulted in the formation of VGCF-embedded SE coating layer. This enlarged the active surface area and facilitated electron conduction, yielding an electrochemical performance higher than that of SE–SP@CAM and comparable to that of SE@CAM. This study revealed the impact of CA incorporation during the SE coating process on the morphology of the coating layer and composite electrode structure. Furthermore, it emphasizes the importance of the mixing protocol and CA selection in electrode fabrication, offering valuable insights into developing high-performance ASSBs. © 2025 Elsevier B.V., All rights reserved. Fri, 31 Oct 2025 15:00:00 GMT https://scholar.dgist.ac.kr/handle/20.500.11750/60113 2025-10-31T15:00:00Z https://scholar.dgist.ac.kr/handle/20.500.11750/59955 Title: Surface and interfacial cutting analysis system for adhesive strength measurement in rechargeable lithium batteries Author(s): Bak, Cheol; Choi, Seungyeop; Yang, Wonseok; Kim, Hyemin; Seo, Jun-pyo; Kang, Dongyoon; Lim, Jaejin; Choi, Jaecheol; Lee, Yong Min Abstract: The adhesive strength of composite electrodes in rechargeable batteries significantly affects their long-term reliability and electrochemical performance. As an alternative to the conventional peel test, the surface and interfacial cutting analysis system (SAICAS) offers an advanced characterization of adhesive strength through precise force measurements with a microblade at microscale depths. This review comprehensively summarizes the recent progress in SAICAS applications for measuring the adhesive properties of lithium-ion battery (LIB) electrodes and ceramic-coated separators under various conditions such as liquid electrolyte impregnation (i.e., wet adhesion). In addition, SAICAS applications extend beyond LIBs to all-solid-state, lithium‑sulfur, and aqueous Zn-ion batteries. However, because these studies have only reported measured results without standard measurement protocols, this review critically examines them to suggest better measurement conditions or provide more reasonable discussion points. This leads to a better understanding of adhesive strength and suggests agreed-upon measurement protocols depending on the battery type or measurement conditions. Sat, 28 Feb 2026 15:00:00 GMT https://scholar.dgist.ac.kr/handle/20.500.11750/59955 2026-02-28T15:00:00Z https://scholar.dgist.ac.kr/handle/20.500.11750/59352 Title: Regularly Arranged Micropore Architecture Enables Efficient Lithium-Ion Transport in SiOx/Artificial Graphite Composite Electrode Author(s): Lim, Jaejin; Kang, Dongyoon; Bak, Cheol; Choi, Seungyeop; Lee, Mingyu; Lee, Hongkyung; Lee, Yong Min Abstract: To enhance the electrochemical performance of lithium-ion battery anodes with higher silicon content, it is essential to engineer their microstructure for better lithium-ion transport and mitigated volume change as well. Herein, we suggest an effective approach to control the micropore structure of silicon oxide (SiOx)/artificial graphite (AG) composite electrodes using a perforated current collector. The electrode features a unique pore structure, where alternating high-porosity domains and low-porosity domains markedly reduce overall electrode resistance, leading to a 20% improvement in rate capability at a 5C-rate discharge condition. Using microstructure-resolved modeling and simulations, we demonstrate that the patterned micropore structure enhances lithium-ion transport, mitigating the electrolyte concentration gradient of lithium-ion. Additionally, perforating current collector with a chemical etching process increases the number of hydrogen bonding sites and enlarges the interface with the SiOx/AG composite electrode, significantly improving adhesion strength. This, in turn, suppresses mechanical degradation and leads to a 50% higher capacity retention. Thus, regularly arranged micropore structure enabled by the perforated current collector successfully improves both rate capability and cycle life in SiOx/AG composite electrodes, providing valuable insights into electrode engineering. Tue, 30 Sep 2025 15:00:00 GMT https://scholar.dgist.ac.kr/handle/20.500.11750/59352 2025-09-30T15:00:00Z