https://scholar.dgist.ac.kr/handle/20.500.11750/6123 2026-04-05T07:27:35Z https://scholar.dgist.ac.kr/handle/20.500.11750/60159 Title: 4전극 시스템 및 이를 이용한 전위 측정 방법 Author(s): 최승엽; 임재진; 이용민 Abstract: 본 발명은 전위를 측정하기 원하는 전극인 제1전극부재 및 제2전극부재; 저 분극형 기준전극인 제1기준전극부재; 및 상기 제1기준전극부재의 사전 리튬화를 위한 제2기준전극부재;를 포함하며, 상기 제1전극부재, 제2전극부재, 제1기준전극부재 및 제2기준전극부재는 외장부재의 4면에 한 개씩 위치하고, 상기 제1전극부재와 상기 제2전극부재는 상호 대향하게 일정거리 이격 배치되며, 상기 제1기준전극부재와 상기 제2기준전극부재는 서로 대항하게 일정거리 이격 배치되어 십자형 구조를 형성하는 4전극 시스템 및 이를 이용한 전위 측정 방법에 관한 것이다. https://scholar.dgist.ac.kr/handle/20.500.11750/60152 Title: 다공성 프레임 기반 박막형 고체전해질막 조성물 및 그 제조방법 그리고 이를 적용한 전고체 전지 Author(s): 노영준; 안진혁; 김도환; 하회진; 조국영; 장은광; 송지훈; 강석훈; 최회주; 이영기; 이용민; 김동현 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. 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. 2025-10-31T15:00:00Z