A5070451182- Advancements in Battery Materials
- Advanced Battery Materials and Technologies
- Supercapacitor Materials and Fabrication
- Electrocatalysts for Energy Conversion
- Electrochemical Analysis and Applications
- Semiconductor materials and devices
- Advanced Battery Technologies Research
- Inorganic Fluorides and Related Compounds
- Extraction and Separation Processes
- Mesoporous Materials and Catalysis
- Clay minerals and soil interactions
- Phase-change materials and chalcogenides
- Hydrogen Storage and Materials
- Conducting polymers and applications
- Advanced battery technologies research
- Graphene research and applications
- Advanced Data Storage Technologies
- Catalytic Processes in Materials Science
- ZnO doping and properties
- Spectroscopy and Quantum Chemical Studies
- Fiber-reinforced polymer composites
- Chalcogenide Semiconductor Thin Films
- Advanced Photocatalysis Techniques
- Catalysis and Oxidation Reactions
- Nonlinear Optical Materials Studies
Korea Institute of Ceramic Engineering and Technology
2017-2024
Government of the Republic of Korea
2014-2021
Samsung (South Korea)
2012-2019
Pohang University of Science and Technology
2010-2017
International University of Korea
2017
Korea Post
2014-2016
Institute of Chemical Engineering
2014
Indiana University – Purdue University Indianapolis
2013
Seoul National University
2012
Kwangwoon University
1998-2011
Hybrid supercapacitors (battery-supercapacitor hybrid devices, HSCs) deliver high energy within seconds (excellent rate capability) with stable cyclability. One of the key limitations in developing high-performance HSCs is imbalance power capability between sluggish Faradaic lithium-intercalation anode and rapid non-Faradaic capacitive cathode. To solve this problem, we synthesize Nb2O5@carbon core-shell nanocyrstals (Nb2O5@C NCs) as high-power materials controlled crystalline phases...
Recently, hybrid supercapacitors (HSCs), which combine the use of battery and supercapacitor, have been extensively studied in order to satisfy increasing demands for large energy density high power capability energy-storage devices. For this purpose, requirement anode materials that provide enhanced charge storage sites (high capacity) accommodate fast transport rate capability) has increased. Herein, therefore, a preparation nanocomposite as material is presented an advanced HSC using it...
Sodium‐ion hybrid supercapacitors (Na‐HSCs) have potential for mid‐ to large‐scale energy storage applications because of their high energy/power densities, long cycle life, and the low cost sodium. However, one obstacles developing Na‐HSCs is imbalance kinetics from different charge mechanisms between sluggish faradaic anode rapid non‐faradaic capacitive cathode. Thus, develop high‐power Na‐HSC materials, this paper presents facile synthesis nanocomposites comprising Nb 2 O 5 @Carbon...
A mesostructured spinel Li4Ti5O12 (LTO)-carbon nanocomposite (denoted as Meso-LTO-C) with large (>15 nm) and uniform pores is simply synthesized via block copolymer self-assembly. Exceptionally high rate capability then demonstrated for Li-ion battery (LIB) negative electrodes. Polyisoprene-block-poly(ethylene oxide) (PI-b-PEO) a sp2-hybridized carbon-containing hydrophobic employed structure-directing agent. Then the assembled composite material crystallized at 700 °C enabling conversion to...
We report mesoporous composite materials (m-GeO2, m-GeO2/C, and m-Ge-GeO2/C) with large pore size which are synthesized by a simple block copolymer directed self-assembly. m-Ge/GeO2/C shows greatly enhanced Coulombic efficiency, high reversible capacity (1631 mA h g(-1)), stable cycle life compared the other bulk GeO2 electrodes. exhibits one of highest areal capacities (1.65 cm(-2)) among previously reported Ge- GeO2-based anodes. The superior electrochemical performance in arises from...
In order to achieve high-power and -energy anodes operating above 1.0 V (vs Li/Li+), titanium-based materials have been investigated for a long time. However, theoretically low lithium charge capacities of titanium-anodes required new types high-capacity anode materials. As candidate, TiNb2O7 has attracted much attention due the high theoretical capacity 387.6 mA h g–1. formation temperature phase resulted in large-sized crystals, thus resulting poor rate capability. Herein, ordered...
A general method to synthesize mesoporous metal oxide@N-doped macroporous graphene composite by heat-treatment of electrostatically co-assembled amine-functionalized silica/metal oxide and oxide, subsequent silica removal produce N-doped simultaneously is reported. Four oxides (WO3− x , Co3O4, Mn2O3, Fe3O4) are encapsulated in graphene. Used as an anode material for sodium-ion hybrid supercapacitors (Na-HSCs), reduced tungsten (m-WO3− @NM-rGO) gives outstanding rate capability stable cycle...
The development of engineered silica particles by using low-cost renewable or waste resources is a key example sustainability. Rice husks have emerged as resource for the production well bioenergy. This review presents state-of-the-art process from rice via bottom-up process. first part this focuses on extraction Si through combustion and chemical reactions. second details technologies synthesizing silicate obtained husks. These include precipitation particles, control morphological...
A rapid and relatively large-scale production of ultrathin TiO2 nanodisks was achieved under mild conditions by developing a novel simple sol–gel process occurring at the interface an organic solvent ice. Owing to structure unusually high surface area (>400 m2 g−1), exhibited reversible capacity (191.4 mA h g−1 0.2 C) excellent rate performance (58% retention 20 as anode in lithium ion batteries.
Metal fluorides (MFx) are one of the most attractive cathode candidates for Li ion batteries (LIBs) due to their high conversion potentials with large capacities. However, only a limited number synthetic methods, generally involving highly toxic or inaccessible reagents, currently exist, which has made it difficult produce well-designed nanostructures suitable cathodes; consequently, harnessing potential cathodic properties been challenge. Herein, we report new bottom-up method utilizing...
Lithium metal is promising anode material for next-generation battery system. Here, mesoporous carbon applied as a host and it extends Li metal's cycle life.
Reaching the border of capable energy limit in existing battery technology has turned research attention away from rebirth unstable Li-metal anode chemistry order to achieve exceptional performance. Strict regulation dendritic Li surface reaction, which results a short circuit and safety issues, should be achieved realize batteries. Herein, this study reports surface-flattening interface product stabilizing agent employing methyl pyrrolidone (MP) molecular dipoles electrolyte for cyclable...
Niobium nitride is first reported as an ultra-stable anode for KIBs. The superior electrochemical performance attributed to large host accommodating K ions with small-strain, and a high portion of the surface-controlled reaction.
For practical use of Li metal anode, developing the stabilization method with simple fabrication steps is necessary. Here, biopolymer-based hybrid film preparation extended cycle life (>1000 h) under additive-free condition.
The market growth of mobile applications such as smart phones and tablet computers has fueled the explosive demand NAND Flash memories having high density fast throughput. To meet a demand, we present 64Gb multilevel cell (MLC) memory 533Mb/s DDR interface in sub-20nm technology. Large floating-gate (FG) coupling interference program disturbance are major challenges to impede scaling technology node [1]. In this paper, correction-before-coupling (CBC) reprogram P3-pattern pre-pulse scheme,...
A two-stage continuous process was developed for improved silica extraction from rice husk. The consists of attrition ball milling and alkaline leaching methods. To find the optimum conditions process, effects parameters, such as solution type reaction conditions, on yield were investigated in a batch process. use NaOH showed slightly higher than KOH. found to be 0.2 M, 80 °C, 3 h, 6% (w/v) concentration, temperature, duration time, solid content, respectively. Attrition used make...
A Li-ion hybrid supercapacitor (Li-HSC) delivering high energy within seconds (excellent rate performance) with stable cycle life is one of the most highly attractive storage devices.