A5057784387- Advancements in Battery Materials
- Advanced Battery Materials and Technologies
- Advanced Battery Technologies Research
- Extraction and Separation Processes
- Supercapacitor Materials and Fabrication
- Nanotechnology research and applications
- Carbon Nanotubes in Composites
- Semiconductor materials and interfaces
- Fuel Cells and Related Materials
- Semiconductor materials and devices
- Mechanical and Optical Resonators
- Ionic liquids properties and applications
- Nanowire Synthesis and Applications
- Conducting polymers and applications
- Ion-surface interactions and analysis
Massachusetts Institute of Technology
2022-2024
Gachon University
2024
Ulsan National Institute of Science and Technology
2016-2023
Samsung (South Korea)
2002
Korea Electrotechnology Research Institute
1996-1998
Abstract The layered nickel‐rich cathode materials are considered as promising for lithium‐ion batteries (LIBs) due to their high reversible capacity and low cost. However, several significant challenges, such the unstable powder properties limited electrode density, hindered practical application of with nickel content over 80%. Herein, important stability issues in‐depth understanding on basis industrial fabrication condition commercialization reviewed. A variety factors threatening...
Battery industries and research groups are further investigating LiCoO 2 to unravel the capacity at high‐voltages (>4.3 vs Li). The trends towards surface modification of stabilize it structurally chemically. In this report, recent progress in surface‐coating materials i.e., single‐element, binary, ternary hybrid‐materials etc. their coating methods illustrated. Further, importance evaluating surface‐coated Li‐ion full‐cell is highlighted with our results. Mg,P‐coated full‐cells exhibit...
Conventional nickel-rich cathode materials suffer from reaction heterogeneity during electrochemical cycling particularly at high temperature, because of their polycrystalline properties and secondary particle morphology. Despite intensive research on the morphological evolution materials, its practical investigation electrode cell levels is still rarely discussed. Herein, an intrinsic limitation in high-energy full-cells discovered under industrial electrode-fabrication conditions. Owing to...
Abstract Lithium-excess 3 d -transition-metal layered oxides (Li 1+ x Ni y Co z Mn 1− − O 2 , >250 mAh g −1 ) suffer from severe voltage decay upon cycling, which decreases energy density and hinders further research development. Nevertheless, the lack of understanding on chemical structural uniqueness material prevents interpretation internal degradation chemistry. Here, we discover a fundamental reason phenomenon by comparing ordered cation-disordered materials with combination X-ray...
Abstract A practical solution is presented to increase the stability of 4.45 V LiCoO 2 via high‐temperature Ni doping, without adding any extra synthesis step or cost. How a putative uniform bulk doping with highly soluble elements can profoundly modify surface chemistry and structural identified from systematic chemical microstructural analyses. This modification has an electronic origin, where surface‐oxygen‐loss induced Co reduction that favors tetrahedral site causes damaging spinel...
We have fabricated fully vacuum-sealed 5 in. diagonal carbon nanotube field-emission displays of a gated structure with reliable electron emission characteristics. Single-walled tips were implemented into the gate using self-aligned backside exposure photosensitive paste. An onset electrode voltage for was about 60 V and luminance as high 510 cd/m2 exhibited under an application 100 1.5 kV to anode, respectively.
Li- and Mn-rich layered oxides (LMRs) have emerged as practically feasible cathode materials for high-energy-density Li-ion batteries due to their extra anionic redox behavior market competitiveness. However, sluggish kinetics regions (<3.5 V vs Li/Li+ ) associated with chemistry engender LMRs chemical irreversibility (first-cycle irreversibility, poor rate properties, voltage fading), which limits practical use. Herein, the structural origin of this is revealed through a comparative study...
Abstract In recent years, Li‐ and Mn‐rich layered oxides (LMRs) have been vigorously explored as promising cathodes for next‐generation, Li‐ion batteries due to their high specific energy. Nevertheless, actual implementation is still far from a reality since the trade‐off relationship between particle size chemical reversibility prevents LMRs achieving satisfactory, industrial energy density. To solve this material dilemma, herein, novel morphological structural design introduced Li 1.11 Mn...
Abstract The recent development of high‐energy LiCoO 2 (LCO) and progress in the material recycling technology have brought Co‐based materials under limelight, although their capacity still suffers from structural instability at highly delithiated states. Thus, this study, a secondary doping ion substitution method is proposed to improve electrochemical reversibility LCO for Li‐ion batteries. To overcome states, Na ions are utilized as functional dopants exert pillar effect Li sites. In...
The rapid growth in lithium-ion battery technology underscores the urgent need for sustainable recycling to address environmental and economic challenges of wastes. This study introduces a liquified-salts-assisted upcycling...
In article number 1702028, Jaephil Cho, Minjoon Park and co-workers, review recent progress in nickel-rich cathode materials for industrial use, focusing on the material electrode designs terms of their commercialization lithium-ion batteries. Currently, low stability limited density are key challenges to overcome. this regard, authors provide innovative potential research directions, addressing current limitations practical use cathodes.
Ni-rich cathodes are the most promising candidates for realizing high-energy-density Li-ion batteries. However, high-valence Ni4+ ions formed in highly delithiated states prone to reduction lower valence states, such as Ni3+ and Ni2+ , which may cause lattice oxygen loss, cation mixing, Ni ion dissolution. Further, LiPF6 a key salt commercialized electrolytes, undergoes hydrolysis produce acidic compounds, accelerate Ni-ion dissolution interfacial deterioration of cathode. Dissolved migrate...
Abstract There has recently been an increasing volume of research in silicon‐based anodes for high energy density lithium‐ion batteries. Micron‐sized composites with tap and a number pores accommodating the massive expansion silicon (Si) exhibit considerable electrochemical performance volumetric density. However, huge pressure on particle during calendering process brings about mechanical failure which causes formation additional by‐products upon lithiation electrical contact loss. Here, we...
Ionic conductivities of the polymer electrolytes prepared from ionomer (poly(methyl methacrylate-co-alkali metal methacrylate)), lithium perchlorate, and ethylene carbonate as a plasticizer, were studied function ion content alkali-metal cation ionomer. It was possible to obtain tough films with room-temperature ionic ∼ 10-3 S/cm. The maximum obtained at 5 mol % for both Li Na effects on mainly interpreted in terms characteristics aggregate formed electrolytes. thermal dependence...
In article number 1601507, Zaiping Guo, Jaephil Cho, and co-workers report recent advances in surface-engineering of LiCoO2 to achieve highenergy Li-ion full-cells. The cells with surface-engineered show excellent electrochemical thermal properties at high cutoff voltages elevated temperatures are competitive for next-generation applications.