A5036005249- Advancements in Battery Materials
- Advanced Battery Materials and Technologies
- Advanced Battery Technologies Research
- Electrocatalysts for Energy Conversion
- Supercapacitor Materials and Fabrication
- Semiconductor materials and devices
- Extraction and Separation Processes
- Corrosion Behavior and Inhibition
- Fuel Cells and Related Materials
- Photonic and Optical Devices
- Semiconductor materials and interfaces
- Metal-Organic Frameworks: Synthesis and Applications
- Advanced battery technologies research
- Synthesis and properties of polymers
- Semiconductor Lasers and Optical Devices
- MXene and MAX Phase Materials
- Quantum optics and atomic interactions
- Concrete Corrosion and Durability
- Chemical Synthesis and Characterization
- Graphene research and applications
- Electron and X-Ray Spectroscopy Techniques
- Conducting polymers and applications
- Concrete and Cement Materials Research
- Mesoporous Materials and Catalysis
- Electrical Contact Performance and Analysis
Hyundai Motors (South Korea)
2023-2025
Pusan National University
2011-2017
Government of the Republic of Korea
2015
Xiangtan University
2014
A spatial confiment of polysulfides using the metal compound additives having polar surfaces has been considered to be a promising approach address insufficient rate capability and cyclability lithium–sulfur batteries. Herein, we report more effective outperforming this conventional one: heterogeneous catalysis promote polysulfide fragmentations. It was revealed combined computational experimental approaches that an ultrastrong adsorption elemental sulfur on TiN resulted in spontaenous...
Polytetrafluoroethylene (PTFE)-based dry process for lithium-ion batteries is gaining attention as a battery manufacturing scheme can be simplified with drastically reducing environmental damage. However, the electrochemical instability of PTFE in environment has hampered realization high-performance dry-processed anode. In this study, we present non-electroconductive and highly ionic-conductive polymer coating on graphite to mitigate degradation binder minimize resistance. Poly(ethylene...
Abstract An ordered mesoporous tungsten‐oxide/carbon (denoted as m‐WO 3− x ‐C‐s) nanocomposite is synthesized using a simple one‐pot method polystyrene‐ block ‐poly(ethylene oxide) (PS‐ b ‐PEO) structure‐directing agent. The hydrophilic PEO interacts with the carbon and tungsten precursors (resol polymer WCl 6 ), PS converted to pores after heating at 700 °C under nitrogen flow. ‐C‐s has high Brunauer–Emmett–Teller (BET) surface area hexagonally pores. Because of its structure intrinsic...
Since one of the main drawbacks Li4Ti5O12 as a negative-electrode material is its low electronic conductivity, several researchers have attempted to improve conductivity by narrowing band gap through transition-metal doping. Herein, we report another, more significant effect doping in addition narrowing, namely, an anomalous decrease structural disorder upon Cr3+-ion Although it generally recognized that with heterogeneous elements increases disorder, demonstrated unexpected phenomenon. From...
Mo-doped TiNb2O7 (TNO) anode material has shown excellent electrochemical performance, especially at high C-rates. Doping TNO with Mo(6+) resulted in charge redistribution, leading to the enhancement of electronic conductivity (caused by bandgap narrowing) and Li(+) diffusivity lattice.
The solvent-free manufacturing process for battery electrodes has gathered increased scientific interest due to its cost reduction, eco-friendliness, and ability enhance electrode density. Carbon nanotubes (CNTs) are anticipated improve performance, owing their exceptional electrical conductivity unique one-dimensional morphology. In this study, we demonstrate that the integration of ozone treatment CNTs can further electrochemical performance high-loading (30 mg/cm2 or higher) dry-processed...
Li4Ti5O12 (LTO) is recognized as being one of the most promising anode materials for high power Li ion batteries; however, its insulating nature a major drawback. In recent years, simple thermal treatment carried out in reducing atmosphere has been shown to generate oxygen vacancies (VO) increasing electronic conductivity this material. Such structural defects, lead re-oxidization over time, causing serious deterioration performance. Herein, we report unique approach with simultaneous...
Abstract Ag is considered to be one of the best candidates for oxygen reduction reaction electrocatalysts in alkaline media application various electrochemical energy devices. In this study, we demonstrate that water activation a key factor enhancing ORR activity media, unlike acid environments. supported on LaMnO 3 having high oxophilicity showed markedly higher than carbon with inert surfaces. Through tests, it was revealed origin enhanced Ag/LaMnO bifunctional effect mainly due at...
Abstract The dry battery electrode (DBE) process offers significant advantages over conventional wet‐coating methods for fabrication. Unlike traditional processes that rely on toxic solvents such as N‐methyl‐2‐pyrrolidone (NMP), the DBE technique uses solvent‐free methods, reducing environmental impact and production costs while enhancing compatibility performance. However, polytetrafluoroethylene (PTFE), only binder currently used large‐scale fabrication (binder fibrillation), faces...
As an attempt to develop lithium ion batteries with excellent performance, which is desirable for a variety of applications including mobile electronics, electrical vehicles, and utility grids, the battery community has continuously pursued cathode materials that function at higher potentials efficient kinetics insertion extraction. By employing both experimental theoretical tools, herein we report multicomponent pyrophosphate (Li(2)MP(2)O(7), M = Fe(1/3)Mn(1/3)Co(1/3)) novel advantageous...
Abstract Since Li 4 Ti 5 O 12 as a promising anode material in lithium-ion batteries (LIBs) has poor rate performance due to low electronic conductivity, doping of with heterogeneous atoms been considered overcome this problem. Herein, we report that there is an upper limit level maintain the zero strain characteristics lattice during charge/discharge process. By using synchrotron studies, it was revealed + diffusivity maximized at certain for which conductivity markedly increased...
Sulfur-nickel foam cathode materials prepared by an in situ solution-based method were served as electrode of lithium-sulfur (Li-S) batteries. At the rate 0.5 C, Li-S cells deliver initial discharge capacity 1340 mAh g−1 and 493 after 500 cycles. It is shown that these are high stabilities with a nearly 100% stable coulombic efficiency at various rates from 0.1 C to 5 C. The electrochemical stability batteries mainly due strong binding between highly dispersed sulfur nickel skeletons.
A study by S. Yoon, J. Lee, and co-workers on the improvement of rate performance highlights an important issue for pseudocapacitor electrode materials. On page 3747, synthesis ordered mesoporous tungsten oxide–carbon nanocomposite is presented via a ‘one-pot’ soft-template method. The structure, partial reduction metal oxide, nanosized mixing oxide/carbon result in both high power energy density.
<TEX>$Li_4Ti_5O_{12}$</TEX>는 우수한 안정성으로 고출력 배터리의 음극 물질로 주 목 받고 있다. 그러나 절연체로서 전도도의 개선이 필요한 상황으로 다양한 방법이 시도되고 본 연구에서는 Cr 도핑을 통해서 <TEX>$Li_4Ti_5O_{12}$</TEX>의 전도도 향상을 목표로 하였으며, X-선 흡수 실험 및 FEFF 8.4 코드를 이용한 제일원리 계산을 도핑에 의한 미세 구조 전자 구조의 변화를 분석하였다. 도핑은 페르미 레벨을 d 밴드의 중심에 위치시켜 전도성을향상시켰으며, Ti 전자밀도를 높여 XANES pre-edge및 White line의 야기했다. <TEX>$Li_4Ti_5O_{12}$</TEX> has been considered a potential material for high power lithium batteries. Since is however an insulator having broad band gap, various...
<TEX>$Li_4Ti_5O_{12}$</TEX>는 우수한 안정성으로 자동차용 리튬 이온 이차전지의 음극 활물질로서 각광 받고 있다. 그러나 넓은 밴드갭에 기인한 절연체 특성으로 고율 충/방전을 가능하게 하기 위해서는 전자 전도도의 개선이 필수적이다. 본 연구에서는 Cr 도핑을 통해 <TEX>$Li_4Ti_5O_{12}$</TEX>의 전도도 개선을 목표로 하였으며, wet-mixing법을 통한 물질 합성시 도판트인 프리커서의 용해도 차이에 의한 Cr-doped 전기화학적 특성 변화를 고찰하고자 하였다. 시료의 물리적 특성은 ICP, XRD, SEM, EXAFS을 통하여 확인하였고 1.0V~3.0V (vs. <TEX>$Li/Li^+$</TEX>) 하에서 충/방전 특성을 조사하였다. 용해도는 합성된 물질의 상(phase) 및 모폴로지에 큰 영향을 미쳤으며, 가장 용해도가 높은 <TEX>$Cr(NO_3)_2$</TEX> 프리커서로부터 경우 Bare...
Abstract Li 2 Fe 1/3 Mn Co P O 7 is synthesized by solid state reaction of stoichiometric amounts CO 3 , (NH 4 ) HPO and MC (M: Fe, Mn, Co) at 600 °C for 6 h under flowing Ar.