A5028680203- Metal and Thin Film Mechanics
- Diamond and Carbon-based Materials Research
- Ion-surface interactions and analysis
- Plasma Diagnostics and Applications
- Advancements in Battery Materials
- Advanced materials and composites
- Advanced Battery Materials and Technologies
- Corrosion Behavior and Inhibition
- Magnesium Alloys: Properties and Applications
- Surface Modification and Superhydrophobicity
- Semiconductor materials and devices
- Aluminum Alloys Composites Properties
- High-Temperature Coating Behaviors
- ZnO doping and properties
- Icing and De-icing Technologies
- Supercapacitor Materials and Fabrication
- Advanced Battery Technologies Research
- Titanium Alloys Microstructure and Properties
- Nuclear materials and radiation effects
- Lubricants and Their Additives
- VLSI and FPGA Design Techniques
- GaN-based semiconductor devices and materials
- Nanomaterials and Printing Technologies
- MXene and MAX Phase Materials
- Extraction and Separation Processes
Peking University
2016-2025
Peking University Shenzhen Hospital
2013-2024
City University of Hong Kong
2017-2021
State Key Laboratory of Nuclear Physics and Technology
2019-2021
City University of Seattle
2021
Sichuan Agricultural University
2020
Harbin Institute of Technology
2011-2014
National Chung Cheng University
2002-2003
Centre National de la Recherche Scientifique
1997
University of Birmingham
1990
Using ab initio calculations combined with experiments, we clarified how the kinetics of Li-ion diffusion can be tuned in LiNixMnyCozO2 (NMC, x + y z = 1) materials. It is found that Li-ions tend to choose oxygen dumbbell hopping (ODH) at early stage charging (delithiation), and tetrahedral site (TSH) begins dominate when more than 1/3 are extracted. In both ODH TSH, surrounded by nickel (especially low valence state) likely diffuse activation energy form an advantageous path. The Li slab...
Millimeter-scale 3D superlattice arrays composed of dense, regular, and vertically aligned gold nanorods are fabricated by evaporative self-assembly. The regular organization the into a macroscopic enables production plasmonic substrate with excellent sensitivity reproducibility, as well reliability in surface-enhanced Raman scattering. work bridges gap between nanoscale materials applications. As service to our authors readers, this journal provides supporting information supplied authors....
Layered transition-metal oxides (Li[NixMnyCoz]O2, NMC, or NMCxyz) due to their poor stability when cycled at a high operating voltage (>4.5 V) have limited practical applications in industry. Earlier researches identified Mn(II)-dissolution and some parasitic reactions between NMC surface electrolyte, especially is charged potential, as primarily factors responsible for the fading. In our previous work, we achieved capacity of active material close theoretical value optimized its cycling...
Improving battery capacity and power is a daunting challenge, in Li-ion batteries positive electrodes often set the limitation on both properties. Layered transition-metal oxides have served as mainstream cathode materials for high-energy due to their large theoretical (∼ 280 mAh/g). Here we report significant enhancement of utilization through novel concept material design. By embedding Li(Ni0.5Co0.2Mn0.3)O2 single wall carbon nanotube (CNT) network, created composite which all components...
In the present research, NaF assisted plasma electrolytic oxidation (PEO) is designed to fabricate high-content ZnO nanoparticles doped coating on AZ31B alloy. The microstructure, phase constituents and corrosion behavior of PEO coatings are investigated systematically. results reveal that introduction promotes formation MgF2 nanophases in passivation layer Mg alloy, decreasing breakdown voltage discharge voltage. As a result, continuous arcing caused by high alleviated. With increasing...
Transition metal oxide materials Li(NixMnyCoz)O2 (NMC) based on layered structures are expected to replace LiFePO4 in automotive Li-ion batteries because of their higher specific capacity and operating potential. However, the actual usable is much lower than promised theoretical value [Uchaker, E.; Cao, G. Nano Today 2014, 9, 499-524; Tarascon, J.-M.; Armand, M. Nature 2001, 414, 359-367], addition often poor cycling performance first-cycle Coulombic efficiency, for which Mn(II)-dissolution,...
Grain boundary engineering is a versatile tool for strengthening materials by tuning the composition and bonding structure at interface of neighboring crystallites, this method holds special significance composed small nanograins where ultimate strength dominated grain instead dislocation motion. Here, we report large nanocolumnar copper film that comprises columnar embedded in bamboo-like boron framework synthesized magnetron sputtering co-deposition, reaching high nanoindentation hardness...
In the present study, a three-dimensional multi-interface structured zinc phosphate particle with large specific surface area was prepared by regulating crystal growth process, which applied to develop waterborne epoxy resin coating better corrosion resistance. The results reveal that particles could well coalesce resin. Compared doped and without two-dimensional sheets, has highest potential, lowest current density low-frequency impedance, indicates obvious benefits of on Moreover,...
Transition metal oxide materials Li(NixMnyCoz)O2 (NMCxyz) based on layered structure are potential cathode candidates for automotive Li-ion batteries because of their high specific capacities and operating potentials. However, the actual usable capacity, cycling stability, first-cycle Coulombic efficiency remain far from practical. Previously, we reported a combined strategy consisting depolarization with embedded carbon nanotube (CNT) activation through pre-lithiation NMC host, which...
Atomic layer deposition (ALD) of Aluminum oxide (Al2O3) is employed to optimize the back contact thin film CdTe solar cells. Al2O3 layers with a thickness 0.5 nm 5 are tested, and an improved efficiency, up 12.1%, found 1 deposition, compared efficiency 10.7% without modification. The performance improvement stems from surface modification that optimizes rectification tunneling contact. current-voltage analysis indicates maintains large leakage current improves filled factor cells through...
Hydrophobic/superhydrophobic materials with intrinsic water repellence are highly desirable in engineering fields including anti-icing aerocrafts, antidrag and anticorrosion ships, antifog self-cleaning optical lenses, screen, mirrors, windows. However, superhydrophobic material should have small surface energy (SE) a micro/nanosurface structure which can reduce solid-liquid contact significantly. The low SE is generally found organic inferior mechanical properties that undesirable...