A5100459016- Advancements in Battery Materials
- Advanced Battery Materials and Technologies
- Advancements in Solid Oxide Fuel Cells
- Advanced Battery Technologies Research
- Magnetic and transport properties of perovskites and related materials
- Electronic and Structural Properties of Oxides
- Supercapacitor Materials and Fabrication
- Extraction and Separation Processes
- Semiconductor materials and devices
- Geology and Paleoclimatology Research
- Additive Manufacturing and 3D Printing Technologies
- Thermal Expansion and Ionic Conductivity
- Ferroelectric and Piezoelectric Materials
- Reproductive tract infections research
- Glass properties and applications
- Catalytic Processes in Materials Science
- Semiconductor materials and interfaces
- Marine and Coastal Research
- Fuel Cells and Related Materials
- Plasma Applications and Diagnostics
- Plasma Diagnostics and Applications
- Methane Hydrates and Related Phenomena
- Isotope Analysis in Ecology
- Microwave Dielectric Ceramics Synthesis
- Magnetic Properties and Synthesis of Ferrites
Korea Institute of Ceramic Engineering and Technology
2017-2025
Sejong University
2025
The Ohio State University
1996-2024
Konkuk University
2009-2024
Seoul National University
2020-2024
Korea Hydrographic and Oceanographic Agency
2024
Korea University of Science and Technology
2019-2023
Korea Electrotechnology Research Institute
2015-2023
Hanyang University
2005-2023
Handong Global University
2023
Nonstoichiometric LiNi0.5Mn1.5O4-δ and stoichiometric LiNi0.5Mn1.5O4 cathodes with two different structures (Fd3̄m P4332) were synthesized by a molten salt method. Rietveld refinement of the X-ray diffraction (XRD) data selected-area electron (SAED) study confirmed that face-centered spinel (Fd3̄m) transformed to primitive simple cubic (P4332) upon additional heating at 700 °C. The cathode having space group Fd3̄m showed better electrochemical behaviors than did P4332, specifically, lower...
The high-voltage LiNi0.5Mn1.5O4 (LNMO) spinel is a promising candidate for positive electrode in lithium ion batteries, but LNMO/graphite full-cells display severe capacity fading issues due to Mn dissolution. In this study, the dissolution behaviors of and Ni were examined systematically under various conditions such as state charge (SOC), temperature, storage time, crystal structure LNMO. addition, surfaces calendar- or cycle-aged LNMO graphite electrodes analyzed by X-ray photoelectron...
(, Sm, Gd, and Y) oxides with a cation ordered perovskite structure have been investigated as cathode materials for intermediate-temperature solid oxide fuel cells (SOFCs). The oxygen content , thermal expansion coefficient (TEC), electrical conductivity (metallic) decrease decreasing size of the ions from to Y. While in TEC is due ionicity Ln–O bond, increasing ion vacancies bending O–Co–O bonds. power density single-cell SOFCs fabricated cathodes, electrolyte, cermet anode ions, partly...
Aligned with an ever growing interest to reduce the operating temperature of solid oxide fuel cells (SOFCs), A-site ordered LnBaCo<sub>2</sub>O<sub>5+δ</sub> layered perovskite family has been actively investigated as cathodes during last decade. This review aims provide recent progress in regard crystal structure, chemical composition, properties, performances, and stability.
Intensive studies of an advanced energy material are reported and lithium polyacrylate (LiPAA) is proven to be a surprisingly unique, multifunctional binder for high‐voltage Li‐ion batteries. The absence effective passivation at the interface cathodes in batteries may negatively affect their electrochemical performance, due detrimental phenomena such as electrolyte solution oxidation dissolution transition metal cations. A strategy introduced build stable cathode–electrolyte interphase LiNi...
Abstract Lithium‐ion (Li‐ion) batteries have been developed for electric vehicle (EV) applications, owing to their high energy density. Recent research and development efforts devoted finding the next generation of cathode materials Li‐ion extend driving distance EVs lower cost. LiNi 0.5 Mn 1.5 O 4 (LNMO) high‐voltage spinel is a promising candidate next‐generation material based on its operating voltage (4.75 V vs. Li), potentially low cost, excellent rate capability. Over last decade, much...
The impact of lithium bis(oxalate)borate (LiBOB) electrolyte additive on the performance full lithium-ion cells pairing high-voltage spinel cathode with graphite anode was systematically investigated. Adding 1 wt % LiBOB to significantly improved cycle life and Coulombic efficiency full-cells at 30 45 °C. As preferentially oxidized reduced compared LiBOB-free during cycling, their relative contributions capacity retention in gauged by fresh LiBOB-treated electrodes various combinations....
Excellent area-specific-resistance (ASR) values have been exhibited by cathode materials with a Sr-doped layer perovskite type structure and therefore show themselves to be possible candidates for intermediate-temperature-operating solid oxide fuel cell (IT-SOFC, 600–800°C) applications. (SBSCO) electrode was sintered onto gadolinia-doped ceria (, CGO91) at form symmetrical cells an ASR value of . The lowest observed when the composite SBSCO CGO91 (SBSCO50) used in conjunction interlayer...
The effect of substitution for on the crystal chemistry, oxygen content, thermal expansion, electrical conductivity, and catalytic activity reduction reaction (ORR) double perovskite oxides has been investigated . system exhibits a structural change from orthorhombic to tetragonal with increasing Sr content. difference in ionic radii between plays dominant role determining oxygen-content value , content oxidation state cobalt increase conductivity increases due an straightening O–Co–O bonds...
The LiNi0.5Mn1.5O4 spinel is an appealing cathode material for next generation rechargeable Li-ion batteries due to its high operating voltage of ∼4.7 V (vs Li/Li+). Although it widely believed that the full range electrochemical cycling involves redox Ni(II)/(IV), has not been experimentally clarified whether Ni(III) exists as intermediate state or a double-electron transfer takes place. Here, combined with theoretical calculations, we show unambiguous spectroscopic evidence when electrode...
Recent calculations and experimental data suggest that understanding the local ordering behavior of Ni/Mn will be critical to optimize electrochemical properties LiNi0.5Mn1.5O4 (LNMO) high voltage spinel. In this study, we systematically controlled evolution Ni Mn in LNMO samples by annealing them at 700 °C air for different dwelling times, followed quenching room temperature. The long- short-range were analyzed combining neutron powder diffraction, X-ray diffraction (XRD), transmission...
3D printing of metallic microarchitectures with controlled internal structures is realized at room temperature in ambient air conditions by the manipulation metal ion concentration and pulsed electric potentials electrolyte meniscus during meniscus-guided electrodeposition. Precise control nozzle enables drawing complex well-defined geometries positions.
The pre‐edges of oxygen‐ K X‐ray absorption spectra have been ubiquitous in transition metal (TM) oxide studies various fields, especially on the fervent topic oxygen redox states battery electrodes. However, critical debates remain use O‐ pre‐edge variations upon electrochemical cycling as evidences reactions, which has a popular practice field. This study presents an investigation 55 oxides covering all 3d TMs with different elements, structures, and through combined experimental...
The rapid expansion of supercritical solutions (RESS) process was used to produce polymeric microparticles or microspheres loaded with pharmaceuticals for drug delivery applications. Poly(l-lactic acid) (l-PLA), naproxen, and a mixture naproxen/l-PLA were dissolved in CO2 precipitated by the RESS process. Composite particles appear as naproxen core encapsulated polymer coating. solubility l-PLA has been measured at 333.15 K pressures ranging from 90 200 bar using dynamic flow apparatus....
To improve the electrochemical property of at high upper voltage limit , fluorine was partly substituted for oxygen. Variation lattice parameters and X-ray photoelectron spectroscopy analysis suggest that is both in bulk coated on surface . ( 0.1) showed stable cycling performance improvement rate capability compared to bare In addition, substitution catalyzes growth primary particles, which turn resulted tap density as well volumetric capacity Differential scanning calorimetry clearly shows...
The electrochemical characteristics of the samarium and strontium doped layered perovskite (SmBa1−xSrxCo2O5+δ, x = 0.5) have been investigated for possible application as a cathode material an intermediate temperature-operating solid oxide fuel cell (IT-SOFC). cathodic polarization single-phase composite cathodes with 10 mol % gadolinia-doped ceria (Ce0.9Gd0.1O2−δ, CGO91) shows that weight ratio between SmBa0.5Sr0.5Co2O5+δ (SBSCO) CGO91 1:1 (50 wt SBSCO 50 CGO91, SBSCO:50) gives lowest area...