A5100377713- Advancements in Battery Materials
- Advanced Battery Technologies Research
- Advanced Battery Materials and Technologies
- Semiconductor materials and devices
- Electrocatalysts for Energy Conversion
- Extraction and Separation Processes
- Engineering Applied Research
- Supercapacitor Materials and Fabrication
- Energy and Environmental Systems
- Semiconductor materials and interfaces
- Power Transformer Diagnostics and Insulation
- Catalysis and Oxidation Reactions
- Refrigeration and Air Conditioning Technologies
- Organic Electronics and Photovoltaics
- Electrohydrodynamics and Fluid Dynamics
- Conducting polymers and applications
- Catalytic Processes in Materials Science
- Advanced Sensor and Energy Harvesting Materials
- Fuel Cells and Related Materials
- Molecular Junctions and Nanostructures
- Nuclear Materials and Properties
- Reliability and Maintenance Optimization
- CO2 Reduction Techniques and Catalysts
- Advancements in Solid Oxide Fuel Cells
- Autonomous Vehicle Technology and Safety
Yeungnam University
2022-2025
Argonne National Laboratory
2020-2023
Pohang University of Science and Technology
2015-2023
IMEC
2023
Inha University
2017-2023
Korea Institute of Ceramic Engineering and Technology
2023
Materials Science & Engineering
2021-2022
Research Organization for Information Science and Technology
2015
Korea Post
2014
The University of Texas at Austin
2006-2008
Abstract Nonaqueous carbonate electrolytes are commonly used in commercial lithium‐ion battery (LIB). However, the sluggish Li + diffusivity and high interfacial charge transfer resistance at low temperature (LT) limit their wide adoption among geographical areas with latitudes altitudes. Herein, a rational design of new is demonstrated, which can significantly improve performance below −20 °C. This electrolyte achieved by tailoring chemical structure, i.e., altering fluorination position...
Low-temperature electrolytes (LTEs) have been considered as one of the most challenging aspects for wide adoption lithium-ion batteries (LIBs) since SOA cannot sufficiently support redox reactions at LT resulting in dramatic performance degradation. Although many attempts taken by employing various noncarbonate solvent electrolytes, there was a lack fundamental understanding limiting factors low-temperature operations (e.g., -20 to -40 °C). In this paper, crucial role...
Silicon is seen as one of the most promising anode candidates for next-generation lithium-ion batteries, due to its high theoretical capacity and energy density. However, many technical barriers remain implementation, chemical/electrochemical reactivities with standard electrolytes incomplete passivation from large volume changes. Herein, we report an isosorbide dimethyl ether (IDE) based electrolyte, which exhibits greatly improved stability, evidenced by long cycle life calendar life. An...
Abstract To impart high stretchability to semiconducting polymers, researchers have used a photocrosslinking approach based on the nitrene chemistry of an azide‐incorporated molecular additive. However, understanding design azide crosslinkers with respect their effects electrical and mechanical properties polymer thin films is lacking. In this study, photocrosslinker's length structure microstructural, features, photocrosslinked conjugated investigated. For systematic comparison, series...
Silicon is a promising alternative anode material to graphite because of its high gravimetric and volumetric energy densities. However, severe capacity fading observed in Si electrodes, it result mechanical changes Si, such as volume changes, stress or fracture. Furthermore, these behaviors are strongly coupled with the electrochemistry Li–Si alloying reaction Si-based including both thermodynamics kinetics. Therefore, electrochemical properties electrodes dependent on control mechanics...
Crosstalk between the cathode and anode in lithium-ion batteries has a great impact on performance, safety, cycle lifetime. However, no report exists for systematic investigation crosstalk behavior silicon (Si)-based cells as function of transition metal composition cathodes. We studied effect degradation Si-rich anodes full with different cathodes having same crystal structure but compositions, such LiNi1/3Mn1/3Co1/3O2 (NM111), LiNi0.5Mn0.3Co0.2O2 (NMC532), LiNi0.8Mn0.1Co0.1O2 (NMC811)....
An enhanced CO 2 electrolysis current density of 2.20 A cm −2 @ 1.5 V at 1123 K is achieved for LSFM electrodes using Fe catalyst rather than Ru, Ni, and Co catalysts.
We report a new triplite-type iron fluoro-sulfate compound, cation-disordered NaFeSO4F that has redox potential of ∼3.7 V versus Na+/Na0 and can have 138 mA·h/g theoretical capacity. This compound shows practical energy density (∼430 W·h/kg) comparable to several Li-ion battery positive electrode materials such as LiMn2O4 (430 W·h/kg). Therefore, triplite is candidate material which meet the requirements for high Na-ion batteries. Furthermore, this study contributes expanding spectrum Na...
Abstract Noble bimetallic nanoparticles (NPs) are nowadays essential in various applications, like CO 2 utilization by dry reforming of methane (DRM), due to their unique and potential properties. A synthesis method for Ru based Janus‐structured NPs is presented via surface interactive assembly deposited emerged Ni species from carefully tailored perovskite oxide support. As noble‐metals typically result the alloy, an exclusive formation mechanism introduced utilizing energetically favorable...
Galvanostatic intermittent titration experiments were performed in three-electrode cells to characterize the effect of C/2, 2-C and 4-C charge rates on observed lithium diffusion coefficient. As part data analysis process, we compared classic Weppner-Huggins polarization with a newer (Wang et al.) method for depolarization data. At low values x LixC6, both methods showed same general trend apparent coefficient, > C/2. The two techniques differed magnitude estimated coefficient by about...
This study explores the effects of transition metal (TM) ions—Ni, Co, Mn, and Fe—on solid-electrolyte interphase (SEI) formation electrochemical behavior graphite silicon (Si) anodes in lithium-ion...
3.9 V triplite LiFeSO<sub>4</sub>F was synthesized by a scalable solid-state reaction within 1 h without undergoing phase transformation. The resulting material has nanosized particles that achieve almost full capacity and superior rate capability even at 10 C (6 min).
We investigated the effect of Si/graphite weight ratio in half-cells on solid electrolyte interphase (SEI) layer's chemistry. The nominal concentrations active materials were (wt % Si/wt Gr) 15/73, 30/58, 60/28, and 80/0. cells consisted either 1.2 M LiPF6 ethylene carbonate/ethyl methyl carbonate (3:7 by wt) or carbonate:ethyl + 10 wt fluoroethylene carbonate. These coin cycled five times at C/10 rate. As expected, addition silicon to electrode significantly increased measured capacity....
Abstract Simultaneously achieving high initial coulombic efficiency (ICE) with reversible capacity and excellent cycle retention is a key factor for developing next‐generation SiO anode, but it has never been achieved. Here, new potential these desired properties simultaneously by controlling of short‐range ordering amorphous 2 matrix in anode reported. The controlled unique microstructure that consists nano‐crystalline Si phase dispersed within ordered while maintaining an state the...
Crosstalk between the cathode and anode in Li-ion batteries has a great impact on performance, safety cycle lifetime.
Earlier work by Fowler, Davaney, and Hagedorn showed that the morphology of an anode streamer could be modeled as stochastic growth a branching fractal tree in point-plane geometry. This investigation reproduces results earlier study. Because one concerns about is electric field dependence appeared to unphysical, model was modified operate under assumptions are consistent with those have proven useful investigations. Specifically, linear assumed there variability number density available...