Kyung Hee University · Medicine
Professor Hayeon Lee's research lab specializes in the development and characterization of advanced cathode materials for sustainable lithium-ion batteries, with a focus on disordered rock-salt oxides and oxyfluorides based on iron, manganese, chromium, and molybdenum. The lab employs multiscale characterization techniques—combining synchrotron and lab-based X-ray diffraction, spectroscopy, and first-principles calculations—to unravel the complex cation distributions and short-range order in these materials, aiming to understand their electrochemical behavior and redox mechanisms. A central theme is enabling high-energy, low-cobalt, and low-nickel cathodes through rational design of Li-excess disordered rock-salt structures.
Figures are computed from collected data and may differ slightly.
PROSPERO; ref. no. CRD42024507035, (https://www.crd.york.ac.uk/prospero/display_record.php?RecordID=507035).
Abstract Li‐excess disordered rock‐salt oxides have emerged as a promising group of cathode materials for Li‐ion batteries. However, the real cation distribution and short‐range order of various disordered oxides have not been fully determined, making it difficult to understand their actual structures and reaction processes. Here, Li 1.233 Mo 0.467 Cr 0.3 O 2 (LMCO), as a cathode material that undergoes a unique in situ cation‐disorder is investigated. Through synchrotron‐ and lab‐based multisca
Institute of Information & Communications Technology Planning & Evaluation, South Korea.
Abstract Developing sustainable Li‐ion batteries requires high‐energy cathodes based on low‐cost, earth‐abundant elements, moving away from low‐reserve nickel and cobalt. Fe‐based oxide cathodes with Fe 3+/4+ and O 2−/n− redox couples offer potential but face low initial Coulombic efficiency and significant voltage hysteresis. This study investigates Li‐excess Fe‐based disordered rock‐salt (DRX) oxyfluorides (Li 2 Fe 0.5 M 0.5 O 2 F; M = Fe, Ti, Mn) using combined electrochemical/spectroscopic c
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