https://scholar.dgist.ac.kr/handle/20.500.11750/6123 2026-05-21T23:00:33Z https://scholar.dgist.ac.kr/handle/20.500.11750/60338 Title: Multi-Faceted Binder Enhancement via Slurry-Applicable Thiol-Ene Click Chemistry for Low-Pressure-Operable All-Solid-State Batteries Author(s): Park, Young Joon; Kim, Kyu Tae; Jun, Seunggoo; Kim, Jong Seok; Yoon, Jaehyun; Bak, Cheol; Lee, Yong Min; Kim, Dong Hyeon; Kim, Ji Young; Jung, Yoon Seok Abstract: Ensuring low-pressure operability is imperative in the practical deployment of all-solid-state batteries (ASSBs) with sulfide solid electrolytes, highlighting the pivotal roles of functional binders. Herein, slurry-applicable thiol-ene click reaction-derived modifications of styrene-butadiene rubber (SBR) binders are introduced to enhance the electrochemo-mechanical stabilities of composite cathodes under low operating pressures. Two key modifications are realized: the grafting of carboxylate functional groups to improve the adhesion and cross-linking to enhance the modulus and elasticity. A key insight gained is that cross-linking is considerably more critical in improving the low-pressure performance than adhesion enhancement. Electrochemical evaluations using single-crystalline LiNi0.8Co0.1Mn0.1O2|Li6PS5Cl|(Li-In) half-cells at 0.3 MPa indicate that LiNi0.8Co0.1Mn0.1O2 electrodes with the cross-linked binder exhibit superior electrochemical performances, including higher initial discharge capacities and improved initial Coulombic efficiencies and capacity retentions compared to those of the unmodified-SBR-based electrodes (163 vs. 133 mA h g-1, 68% vs. 73%, and 67% vs. 75% at the 100th cycle, respectively). Comprehensive analyses, including operando electrochemical pressiometry, reveal that cross-linking effectively maintains the electrode integrity, thereby stabilizing the interfacial resistance during cycling. These findings offer critical design guidelines for practical, high-performance ASSB systems. 2026-01-31T15:00:00Z 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