https://scholar.dgist.ac.kr/handle/20.500.11750/6123 2026-11-11T11:55:12Z https://scholar.dgist.ac.kr/handle/20.500.11750/61066 Title: Calendering-induced interfacial reconfiguration enables electrochemical activation in lithium metal powder electrodes for high-energy-density batteries Author(s): Kang, Dongyoon; Kim, Sun Hyu; Lim, Jaejin; Kim, Hayeon; Dzakpasu, Cyril Bubu; Kim, Eunbi; Jo, Taejin; Lee, Yong Min Abstract: To address the difficulty in achieving both thin and wide lithium (Li) metal electrodes using conventional extrusion and pressing methods, a slurry-based coating process with lithium metal powder (LMP) is considered a promising alternative. By adjusting the coating conditions, this technique allows the fabrication of ultra-thin and wide Li metal electrodes. However, the Li2CO3 passivation layer formed to enhance storage stability is electrically insulating and must be mechanically disrupted prior to using the LMP electrode as an anode. The calendering process, conducted after LMP slurry coating and drying, serves as an essential step that fractures the brittle Li2CO3 layer and exposes the underlying fresh Li metal within the LMP particles. The exposed ductile Li directly contacts adjacent particles or the Cu current collector, thereby extending the electrically conductive network within the electrode and contributing to the formation of electrochemically active LMP. In this study, we systematically investigate how the calendering process affects the structural evolution and electrochemical activation of LMP electrodes. Under varying calendering ratios (from 0% to 40% and 40%+), we examined the correlation between electrode structural changes, Li2CO3 fracture, electrical connection, and the degree of electrochemical activation. Electrochemical activation increased nonlinearly with the calendering ratio, with a critical threshold near 35%. The optimal calendering conditions for LMP activation were determined through experimental validation and simulation analysis. 2026-03-31T15:00:00Z https://scholar.dgist.ac.kr/handle/20.500.11750/61038 Title: 다공성 프레임 기반의 고체전해질막 및 이의 제조방법 그리고 이를 포함하는 전고체전지 Author(s): 김도환; 노영준; 하회진; 김동현; 최회주; 장은광; 조국영; 안진혁; 이용민; 이영기; 강석훈; 송지훈 Abstract: 고체전해질막은 금속 또는 고분자 물질을 포함하는 다공성 프레임; 상기 다공성 프레임의 양면을 덮고, 상기 다공성 프레임의 기공을 채우는 고체전해질입자들; 및 상기 고체전해질입자들 사이의 바인더를 포함한다. https://scholar.dgist.ac.kr/handle/20.500.11750/61009 Title: A thermally conductive ceramic-coated separator with in situ-formed ion-conductive, lithiophilic interphase for stable lithium metal batteries☆ Author(s): Choi, Seungyeop; Choi, Junhyeok; Kang, Dongyoon; Dzakpasu, Cyril Bubu; Kim, Ucheol; Seo, Jun Pyo; Roh, Youngjoon; Rhee, Junki; Lee, Yong Min Abstract: The design of functional separators that can simultaneously regulate interfacial stability and safety remains a critical challenge in lithium metal batteries (LMBs). In this work, we introduce an aluminum nitride-based ceramic-coated separator (AlN-CCS) to address these concerns. The AlN-CCS exhibits enhanced ionic conductivity and electrolyte wettability compared to conventional polyethylene separators, while maintaining comparable physical and ion-conductive properties to oxide-based CCSs. Importantly, the conversion reaction between AlN and Li metal induces the in situ formation of a Li3N-rich solid-electrolyte interphase and a lithiophilic LiAl alloy, effectively reducing nucleation overpotential and promoting uniform Li deposition. As a result, Li||LiNi0.6Co0.2Mn0.2O2 full cells with AlN-CCS demonstrate significantly improved cycling stability, achieving 76.6% capacity retention even after 500 cycles, compared to 59.6% for Al2O3-CCS. Furthermore, owing to the intrinsically high thermal conductivity of AlN, the AlN-CCS enables efficient lateral heat dissipation, effectively mitigating localized hotspot formation under abnormal conditions such as internal short circuits. These results demonstrate that nitride-based CCSs can be an effective and easier alternative to simultaneously enhance electrochemical performance and safety, offering a promising pathway toward high-energy-density and reliable LMBs. 2026-09-30T15:00:00Z https://scholar.dgist.ac.kr/handle/20.500.11750/60991 Title: Electrolyte Lubricants for Solid-State Batteries Author(s): Kim, Won-Yeong; Ryu, Seokhyeon; Lee, Hyobin; Kim, Minwoo; Lee, Jongjun; Oh, Kyeong-Seok; Kim, Dokyung; Kim, Taeryeol; Yang, Wonseok; Han, Sun-Phil; Lee, Tae Woong; Lim, Jaejin; Kim, Hong-, I; Kang, Minsang; Choi, Seungyeop; Kim, Seung-Hyeok; Kwak, Rhokyun; Lee, Young Joo; Lee, Won Bo; Lee, Yong Min; Lee, Sang-Young Abstract: Solid-state batteries (SSBs) promise higher energy density and improved safety, but interparticle voids and unstable solid-solid interfaces still limit their performance. Here, we translate the concept of lubrication into an electrolyte-lubrication strategy for SSBs. We design a solvation-tailored electrolyte lubricant, termed ACE (aggregate cluster electrolyte), in which spatially structured ion-pair clusters direct interphase formation. In ACE, molecular-orbital reconfiguration within Li+-anion clusters favors the growth of a thin, electronically insulating, inorganic-rich solid-liquid electrolyte interphase (SLEI) on sulfide electrolytes, mitigating their intrinsic instability. The fluid ACE infiltrates interparticle voids, forming percolating Li+-conduction networks and facilitating dynamic reconstruction of the solid-electrolyte interphase during cycling. These attributes enable stable Li-metal cycling at reduced external pressure and enhance cathode active-material utilization. Electrochemical-thermal simulations further show that ACE homogenizes ionic fluxes and thermal gradients at the cell scale. Electrolyte lubrication thus emerges as a scalable interfacial-engineering approach for making sulfide-based SSBs operate under more practical conditions. 2026-08-31T15:00:00Z