세미나 공지 및 초록

11월6일 목요일 세종대-건국대 대학원세미나 초청강연 수업이 진행될 예정입니다.

초청연사님의 강연 초록 참고하세요. 많은 참여 바랍니다.

연사: 부산대학교, 유현덕 교수님

일자: 11월 6일 목요일 오후5시부터~

장소: 세종대학교 대양AI센터 107호

Integrated Design Strategies for Next-Generation Lithium-Ion Batteries: From Gradient Cathodes to Electrolyte Modeling and Interfacial Engineering

Hyun Deog Yoo

Department of Chemistry and Institute for Future Earth, Pusan National University

Email: hdyoo@pnu.edu

 

The pursuit of safer and higher-energy lithium-ion batteries (LIBs) demands a multidisciplinary understanding of electrochemical stability across electrodes, electrolytes, and interfaces. This seminar presents an integrated framework that connects three key directions of our recent research: structural design of cathodes, physicochemical modeling of electrolytes, and interfacial enhancement of anodes.

First, we introduce a mathematical–experimental platform that precisely controls the full concentration gradient (FCG) within Ni-rich NCM precursors.¹ Independent modulation of the gradient’s average composition, slope, and curvature leads to mechanically robust and crack-free cathodes after extensive cycling, achieving superior interfacial stability and reduced film resistance.

Second, we extend the classical Kohlrausch’s law by incorporating a ReLU-type correction function, which accounts for the concentration dependence of ionic association, viscosity, and mean activity coefficients.² This modified framework accurately reproduces molar conductivity profiles of nonaqueous electrolytes up to 3.5 M, revealing the physicochemical origins of the anomalous stagnation near solubility limits—critical for advanced electrolyte design and battery management systems.

Third, we demonstrate a scalable solid-state route to coat Li₄Ti₅O₁₂ anodes with a 1.6 nm layer of partially lithiated titania (Li_xTiO₂), a mixed ionic–electronic conductor.³ This nanolayer simultaneously transports Li⁺ ions and electrons, enabling full-surface utilization and enhanced rate capability at high current densities. Combined experimental and DFT analyses confirm metallic conduction and dipole-assisted Li⁺ transport in Li_xTiO₂.

Together, these studies propose a unified design philosophy for high-performance LIBs—leveraging structural gradients, nonlinear transport modeling, and interfacial conductivity tuning. By bridging material synthesis, theoretical modeling, and electrochemical diagnostics, this approach provides actionable pathways toward durable, energy-dense, and safe rechargeable batteries for the next generation of electric mobility and energy storage.

 

References

(1)         Kim, S. et al. ACS Energy Lett. 2025, 10 (7), 3600–3609. https://doi.org/10.1021/acsenergylett.5c01634.

(2)         Srinivasa, M. K. et al. ACS Appl. Mater. Interfaces 2023, 15 (51), 59296–59308. https://doi.org/10.1021/acsami.3c09396.

(3)         Moon, E. J. et al. J. Power Sources 2023, 559, 232657. https://doi.org/10.1016/j.jpowsour.2023.232657.