Kyung Hee University · Engineering
Professor Woosuk Cho's research lab specializes in advanced materials for next-generation lithium-ion and all-solid-state batteries, with a strong focus on enhancing the structural stability, interfacial compatibility, and electrochemical performance of cathode and solid electrolyte materials. Key research directions include surface and bulk doping strategies (e.g., Mn and Ti) to improve thermal and cycle stability of Ni-rich layered oxide cathodes, the development of moisture- and H₂S-resistant solid electrolytes using zeolite composites, and innovative interphase engineering using ionic liquids and polymer matrices to reduce interfacial resistance in all-solid-state batteries. The lab also investigates fundamental degradation mechanisms and practical electrode fabrication challenges, such as void formation in dry-electrode processes, to enable scalable and high-performance battery systems for electric vehicles and grid storage.
Figures are computed from collected data and may differ slightly.
A facile Mn surface doping process is proposed to improve the thermal and structural stabilities of Ni-rich layered cathode materials (Ni ≥ 80%) for lithium-ion batteries in electric vehicles. Herein, we demonstrate that the surface structure of the Ni-rich layered cathode materials can be stabilized by the introduction of a thin Mn-rich surface layer. This layer effectively reduces the direct exposure of the highly reactive Ni on the surface of the cathode materials, thus enhancing thermal stab
A composite electrode containing a zeolite (ZSM-5) embedded Li 6 PS 5 Cl solid electrolyte, where zeolite can act as a scavenger for both toxic H 2 S gas and moisture is designed for realizing high-performance all-solid-state batteries (ASSBs) with improved cycle performance.
For realizing all-solid-state batteries (ASSBs), it is highly desirable to develop a robust solid electrolyte (SE) that has exceptional ionic conductivity and electrochemical stability at room temperature. While argyrodite-type Li<sub>6</sub>PS<sub>5</sub>Cl (LPSCl) SE has garnered attention for its relatively high ionic conductivity (∼3.19 × 10<sup>-3</sup> S cm<sup>-1</sup>), it tends to emit hydrogen sulfide (H<sub>2</sub>S) in the presence of moisture, which can hinder the performance of ASS
An all-solid-state lithium battery based on a sulfide electrolyte is one of the most promising next-generation energy storage systems. However, the high interfacial impedance, particularly due to the internal pores in the electrode or electrolyte layers, is the major limiting factor to the development of sheet-type all-solid-state batteries. In this study, a low-resistance integrated all-solid composite electrode is developed using a hybrid of a pyrrolidinium-based ionic liquid and a polyethylen
In the development of a reliable cathode material for lithium-ion batteries (LIBs), it is crucial to clearly understand the structural degradation mechanism and its correlation with the electrochemical performance. In this context, herein, we thoroughly investigate the positive effects of Ti incorporation into the bulk structure of a Ni-rich layered cathode material, LiNi0.8Co0.1Mn0.1O2 (NCM811). As a result, the structural integrity and thermal stability of NCM811 particles can be enhanced, lea
Abstract Voids are widely disseminated in a powder when mixed, and hence the typical dry‐electrode preparation method yields a sparse dry‐electrode because the external pressure applied to the surface of the mixed powder is not evenly distributed. Consequently, particle cracking and void remnants appear in the electrode after calendaring. This study introduces a practically applicable bi‐functionalized electrode additive to simultaneously reinforce the chemo‐mechanical properties of millimeter‐t
A potential solid electrolyte for realizing all-solid-state battery (ASB) technology has been discovered in the form of Li<sub>10</sub> GeP<sub>2</sub> S<sub>12</sub> (LGPS), a lithium superionic conductor with a high ionic conductivity (≈12 mS cm<sup>-1</sup> ). Unfortunately, the achievable Li<sup>+</sup> conductivity of LGPS is limited in a sheet-type composite electrode owing to the porosity of this electrode structure. For the practical implementation of LGPS, it is crucial to control the p
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