A5102917415- Advancements in Battery Materials
- Advanced Battery Materials and Technologies
- Advanced Battery Technologies Research
- Topological Materials and Phenomena
- Graphene research and applications
- Quantum and electron transport phenomena
- Transportation and Mobility Innovations
- Semiconductor materials and devices
- Magnetic properties of thin films
- Remote Sensing and LiDAR Applications
- Concrete and Cement Materials Research
- 3D Surveying and Cultural Heritage
- Electronic and Structural Properties of Oxides
- Advancements in Solid Oxide Fuel Cells
- 3D Shape Modeling and Analysis
- Geotechnical Engineering and Soil Stabilization
- Membrane-based Ion Separation Techniques
- Electrical Contact Performance and Analysis
- Quantum many-body systems
- Digital Economy and Work Transformation
- Aeroelasticity and Vibration Control
- Fuel Cells and Related Materials
- Nuclear materials and radiation effects
- Smart Parking Systems Research
- Advanced Condensed Matter Physics
Anyang University
2023-2024
Hanyang University
2020-2024
Yonsei University
2010-2024
Snap (United States)
2022
Kookmin University
2022
Korea Environmental Industry and Technology Institute
2014
Kangwon National University
2014
Abstract Roll‐to‐roll dry processing enables the manufacture of high energy density and low cost Li‐ion batteries (LIBs). However, as thickness electrode fabricated by becomes greater (≥10 mAh cm −2 ), migration resistance ( R ion ) charge‐transfer ct in dramatically increase due to long diffusion lengths for electron. Therefore, it is important reduce achieve LIBs. The with a areal capacity 10 can be achieved following three characteristics. First, fibrillization behavior...
LiFePO 4 emerges as a viable alternative to cobalt‐containing cathodes, such Li[Ni 1– x – y Mn Co ]O 2 and 1− − Al . As Fe is abundant in nature, low‐cost material. Moreover, stable structure of imparts long service life thermal stability. However, the practical implementation cathode energy storage devices impeded by its low density high ionic/electrical resistance. Herein, electrode with active material loading resistance through dry process reported for first time. The not only enables...
We performed angle-resolved photoemission (ARPES) experiments with circularly polarized light and first-principles density functional calculation spin-orbit coupling to study surface states of a topological insulator ${\mathrm{Bi}}_{2}{\mathrm{Se}}_{3}$. observed circular dichroism (CD) as large 30% in the ARPES data upper lower Dirac cones showing opposite signs CD. The CD is attributed existence local orbital-angular momentum (OAM). First-principles shows that OAM significant locked...
Abstract The increasing demand for safe lithium‐ion batteries with high energy density has pushed the development of all‐solid‐state (ASSBs). With promising solid electrolytes (SEs) such as Li 10 GeP 2 S 12 and 6 PS 5 Cl ionic conductivity in recent years, bottleneck high‐performance ASSBs is no longer sluggish + diffusion caused by SEs. Furthermore, significant improvement cycle performance been achieved understanding electrochemomechanical properties, preventing undesirable side reactions...
Abstract All‐solid‐state batteries (ASSBs) are expected to be next‐generation energy storage systems due their high density and safety. However, practical use has been limited by a poor rate capability caused the Li dendrite growth. Under operation with current density, migration at interface between anode solid electrolyte (SE) is faster than replenishing atom diffusion inside of Li, resulting in void formation SE. These voids induce increase localized leading growth dendrites. In this...
We report anisotropic Dirac-cone surface bands on a side-surface geometry of the topological insulator Bi${}_{2}$Se${}_{3}$ revealed by first-principles density-functional calculations. find that electron velocity in Dirac cone is anisotropically reduced from (111)-surface cone, and not parallel with wave vector k except for high-symmetry directions. The size spin depends direction due to variation noncollinearity state. anisotropy electronic structures follows corresponding atomic...
In protonic ceramic fuel cells (PCFCs), oxygen reduction reaction activity is governed by the adsorption/dissociation, proton conduction, and electron transfer kinetics. Although various strategies have been explored to enhance conductivity via tuning vacancy concentration in electrode materials introducing electronic conducting agents, there are few studies on improving adsorption/dissociation (surface-exchange reaction) kinetics PCFCs. this study, we report uniformly distributed...
Abstract Anode‐free all‐solid‐state batteries (AF‐ASSBs) have received significant attention as a next‐generation battery system due to their high energy density and safety. However, this still faces challenges, such poor Coulombic efficiency short‐circuiting caused by Li dendrite growth. In study, the AF‐ASSBs are demonstrated with reliable robust electrochemical properties employing Cu–Sn nanotube (NT) thin layer (~1 µm) on Cu current collector for regulating electrodeposition. x Sn phases...
Solid oxide fuel cells (SOFCs) are promising sustainable energy systems due to their high conversion efficiency and low pollutant emission rate. However, the operating temperature induces poor durability of systems. Therefore, it is crucial improve oxygen reduction reaction (ORR) activity cathode material lower temperature. Recently, a double-layered perovskite (AA′B2O5+δ), especially PrBaCo1.6Fe0.4O5+δ (PBCF), has received significant attention its ORR activity. Herein, we report an...
We used reinforcement learning to improve how Lyft matches drivers and riders. The change was implemented globally led more than $30 million per year in incremental driver revenue.
We investigate the Rashba-type spin splitting in Shockley surface states on Au(111) and Ag(111) surfaces, based first-principles calculations. By turning off spin-orbit interaction (SOI) partly, we show that although are mainly of $p$-orbital character with only a small $d$-orbital one, $d$-channel SOI determines direction while $p$-channel has minor negative effects. The states, present even without SOI, varies linearly crystal momentum $k$, resulting linear $k$ dependence splitting,...
We report electronic transport properties of doped Ge-core/Si-shell and Si-core/Ge-shell nanowires (NWs) from first-principles. obtain single-impurity scattering electrons holes using density-functional methods for quantum conductance then estimate charge-carrier mobilities considering multiple impurity scatterings. It is found that in the NW with B-doped Si P-doped Ge have higher than other chemical doping configurations. These results reflect asymmetric radial confinements charge carriers...
Flow-electrode capacitive mixing (F-CapMix) is a novel technology, harvesting electric energy from salinity gradient power. A continuously circulating flow-electrode enables constant electrical power generation without any intermittent step. Graphite widely used current collector because of its high conductivity and corrosion resistivity to seawater for F-CapMix. However, insulating polyacrylate-based polymers should be employed shaping the graphite body, resulting in reduced conductivity,...
In this paper, we present Online Supply Values (OSV), a system for estimating the return of available rideshare drivers to match ride requests at Lyft. Because future driver state can be accurately predicted from request destination, it is possible estimate expected action value assigning an as Markov Decision Process using Bellman Equation. These estimates are updated temporal difference and shown adapt changing marketplace conditions in real-time. While reinforcement learning has been...
We developed a new technique for generating three-dimensional monostatic inverse synthetic aperture radar (ISAR) images using various types of polarimetric information on targets. To remove clutter around target, we adopted the CLEAN method, in which only main signals were reconstructed an iterative algorithm. conducted simulation as follows: electric field data that subjected to scattering obtained target full-wave electromagnetic analysis simulator. The linear polarization 2 × matrix...
Dry Electrode Technology electrode technology has emerged as a promising strategy for manufacturing thick electrodes in the battery industry. In article number 2300302, Patrick Joohyun Kim, Taeseup Song, Junghyun Choi, and co-workers report dry-processed film LiFePO4 with high active material loading. The dry process not only improves electrochemical performance but also achieves energy density low ionic/electrical resistance.