A5001650341- Advancements in Battery Materials
- Advanced Battery Materials and Technologies
- Conducting polymers and applications
- Advanced battery technologies research
- Advanced Surface Polishing Techniques
- Advanced machining processes and optimization
- Organic Electronics and Photovoltaics
- Supercapacitor Materials and Fabrication
- Advanced Thermoelectric Materials and Devices
- Advanced Sensor and Energy Harvesting Materials
- Organic Light-Emitting Diodes Research
- Semiconductor materials and interfaces
- Advanced Machining and Optimization Techniques
- Semiconductor materials and devices
- Microfluidic and Capillary Electrophoresis Applications
- Graphene research and applications
- Nanowire Synthesis and Applications
- Perovskite Materials and Applications
- Thermal Expansion and Ionic Conductivity
- Manufacturing Process and Optimization
- Innovative Microfluidic and Catalytic Techniques Innovation
- Engineering Applied Research
- Microfluidic and Bio-sensing Technologies
- Advanced Battery Technologies Research
- Carbon Nanotubes in Composites
Nanyang Technological University
2016-2025
Pennsylvania State University
2024-2025
Marcus (United States)
2024
LG (South Korea)
2018-2024
Korea Advanced Institute of Science and Technology
2005-2023
Pukyong National University
2020-2023
Seoul National University
2022-2023
Chungbuk National University Hospital
2023
Chungbuk National University
2023
Korea Institute of Industrial Technology
2007-2021
To utilize high-capacity Si anodes in next-generation Li-ion batteries, the physical and chemical transformations during Li–Si reaction must be better understood. Here, situ transmission electron microscopy is used to observe lithiation/delithiation of amorphous nanospheres; an important anode material that has been less studied than crystalline Si. Unexpectedly, experiments reveal first lithiation occurs via a two-phase mechanism, which contrary previous understanding consequences for...
In situ transmission electron microscopy (TEM) is used to study the electrochemical lithiation of high-capacity crystalline Si nanoparticles for use in Li-ion battery anodes. The reaction slows down as it progresses into particle interior, and analysis suggests that this behavior due not diffusion limitation but instead influence mechanical stress on driving force reaction.
Silicon is one of the most attractive anode materials for use in Li-ion batteries due to its ∼10 times higher specific capacity than existing graphite anodes. However, up 400% volume expansion during reaction with Li causes particle pulverization and fracture, which results rapid fading. Although Si nanomaterials have shown improvements electrochemical performance, there limited understanding how takes place. Here, we study shape changes crystalline nanopillars different orientations upon...
From surface hardening of steels to doping semiconductors, atom insertion in solids plays an important role modifying chemical, physical, and electronic properties materials for a variety applications. High densities atomic solid can result dramatic structural transformations associated changes mechanical behavior: This is particularly evident during electrochemical cycling novel battery electrodes, such as alloying anodes, conversion oxides, sulfur oxygen cathodes. Silicon, which undergoes...
Portable power sources and grid-scale storage both require batteries combining high energy density low cost. Zinc metal battery systems are attractive due to the cost of zinc its charge-storage capacity. However, under repeated plating stripping, anodes undergo a well-known problem, dendrite formation, causing internal shorting. Here we show backside-plating configuration that enables long-term cycling without We demonstrate 800 stable cycles nickel-zinc with good rate (20 mA cm(-2), 20 C...
With its high specific capacity, silicon is a promising anode material for high-energy lithium-ion batteries, but volume expansion and fracture during lithium reaction have prevented implementation. Si nanostructures shown resistance to cycling, the critical effects of nanostructure size native surface oxide on cycling performance are not understood. Here, we use an ex situ transmission electron microscopy technique observe same nanowires before after lithiation discovered impacts expansion....
Transparent devices have recently attracted substantial attention. Various applications been demonstrated, including displays, touch screens, and solar cells; however, transparent batteries, a key component in fully integrated devices, not yet reported. As battery electrode materials are to be thick enough store energy, the traditional approach of using thin films for is suitable. Here we demonstrate grid-structured solve this dilemma, which fabricated by microfluidics-assisted method. The...
Significance Tremendous low-grade heat is stored in industrial processes and the environment. Efficient low-cost utilization of critical to imminent energy environmental challenges. Here, a rechargeable electrochemical cell (battery) used harvest such thermal because its voltage changes significantly with temperature. Moreover, by carefully tuning composition electrodes, charging process purely powered no electricity required charge it. A high heat-to-electricity conversion efficiency 2.0%...
Mixing enhancement has drawn a great attention to designing of micromixers, since the flow in microchannel is usually characterized by low Reynolds number (Re) which makes mixing quite difficult task complete. In this regard, we present new chaotic passive micromixer, called barrier embedded micromixer (BEM). BEM, induced periodic perturbation velocity field due periodically inserted barriers along top surface channel while helical type obtained slanted grooves on bottom pressure driven...
Efficient and low-cost systems are desired to harvest the tremendous amount of energy stored in low-grade heat sources (<100 °C). An attractive approach is thermally regenerative electrochemical cycle (TREC), which uses dependence electrode potential on temperature construct a thermodynamic for direct heat-to-electricity conversion. By varying temperature, an cell charged at lower voltage than discharged; thus, thermal converted electricity. Recently, Prussian blue analog-based system with...
Tremendous low-grade heat (i.e., <130 °C) exists in solar thermal, geothermal, and industrial waste heat. Efficient conversion of to electricity can recover these wasted resources reduce energy consumption carbon footprint. Along with thermoelectrics thermogalvanic cells, thermally regenerative electrochemical cycle (TREC) has attracted wide attention recently, because it a high temperature coefficient (>1 mV/K), efficiency, low cost. In TREC, is realized by charging–discharging an cell at...
Abstract Following an explosion of studies silicon as a negative electrode for Li-ion batteries, the anomalous volumetric changes and fracture lithiated single Si particles have attracted significant attention in various fields, including mechanics. However, real lithiation occurs simultaneously clusters confined medium. Hence, understanding how individual structures interact during closed space is necessary. Here, we demonstrate physical mechanical interactions swelling using well-defined...
Polymer-based solid-state electrolytes are shown to be highly promising for realizing low-cost, high-capacity, and safe Li batteries. One major challenge polymer batteries is the relatively high operating temperature (60-80 °C), which means such will require significant ramp up time due heating. On other hand, as poor thermal conductors, variation across electrolyte can lead nonuniformity in ionic conductivity. This detrimental lithium deposition may result dendrite formation. Here, a...
The emergence of on-skin electronics with functions in human–machine interfaces and on-body sensing calls for the development smart flexible batteries high performance. Electrochromic energy-storage devices provide a visual indication capacity through real-time change color without any additional power supply. In this study, dual-function battery supercapacitor skin-interfaced wearable are developed by simple scalable transfer printing method, featuring thickness less than 50 μm....