Author
Jae-Won Lee
Other affiliations: LG Chem, Georgia Institute of Technology
Bio: Jae-Won Lee is an academic researcher from Dankook University. The author has contributed to research in topics: Lithium & Lithium-ion battery. The author has an hindex of 26, co-authored 139 publications receiving 2238 citations. Previous affiliations of Jae-Won Lee include LG Chem & Georgia Institute of Technology.
Topics: Lithium, Lithium-ion battery, Torrefaction, Electrode, Coating
Papers published on a yearly basis
Papers
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TL;DR: The combined advantages of green synthesis, high aqueous stability, high photostability, and low cytotoxicity, the G-dots show considerable promise in various areas, including biomedical imaging, solution state optoelectronics, and plant seed germination and/or growth.
Abstract: We have developed a simple approach for the large-scale synthesis of water-soluble green carbon nanodots (G-dots) from many kinds of large food waste-derived sources. About 120 g of G-dots per 100 kg of food waste can be synthesized using our simple and environmentally friendly synthesis approach. The G-dots exhibit a high degree of solubility in water because of the abundant oxygen-containing functional groups around their surface. The narrow band of photoluminescence emission (400–470 nm) confirms that the size of the G-dots (∼4 nm) is small because of a similar quantum effects and emission traps on the surfaces. The G-dots have excellent photostability; their photoluminescence intensity decreases slowly (∼8%) under continuous excitation with a Xe lamp for 10 days. We carried out cell viability assay to assess the effect of cytotoxicity by introducing G-dots in cells such as Chinese hamster ovary cells (CHO-K1), mouse muscle cells (C2C12), and African green monkey kidney cells (COS-7), up to a concentra...
367 citations
TL;DR: In this paper, the authors investigated new potential materials, such as hydrogen storage and lithium rechargeable batteries, for application in the field of advanced energy conversion and storage, and they were able to synthesize...
Abstract: We investigated new potential materials, such as hydrogen storage and lithium rechargeable batteries, for application in the field of advanced energy conversion and storage. We were able to synthes...
117 citations
TL;DR: In this paper, the effect of temperature, pH, time, and reactant concentrations on the size and morphology of lithium iron phosphate (LiFePO4) particles synthesized in a batch hydrothermal reactor was investigated.
Abstract: The effect of temperature, pH, time, and reactant concentrations on the size and morphology of lithium iron phosphate (LiFePO4) particles synthesized in a batch hydrothermal reactor was investigated in this work. It was found that LiFePO4 could only be synthesized at neutral or slightly basic pH in both subcritical and supercritical water. Synthesis in subcritical water resulted in micron-sized particles of high crystallinity, whereas synthesis in supercritical water produced submicron particles. A more uniform particle size distribution was obtained at low reactant concentrations, irrespective of the synthesis temperature. Qualitative explanations for these observations are provided in terms of nucleation, growth, and agglomeration phenomena at subcritical and supercritical conditions.
105 citations
TL;DR: In this article, two synthesis routes for the production of LiFePO4 particles were investigated in water at subcritical and supercritical conditions, with nano-sized particles predominating when temperature was above the critical temperature of water.
104 citations
TL;DR: In this article, a pyroprocessing integrated inactive demonstration facility (PRIDE) was constructed at KAERI and it began test operation in 2012 to test the process regarding unit process performance, remote operation of equipments, integration of unit processes, scale-up of process, process monitoring, argon environment system operation, and safeguards related activities.
Abstract: Pyroprocessing technology has been actively developed at Korea Atomic Energy Research Institute (KAERI) to meet the necessity of addressing spent fuel management issue. This technology has advantages over aqueous process such as less proliferation risk, treatment of spent fuel with relatively high heat and radioactivity, and compact equipments. This paper describes the pyroprocessing technology development at KAERI from head-end process to waste treatment. The unit process with various scales has been tested to produce the design data associated with scale-up. Pyroprocess integrated inactive demonstration facility (PRIDE) was constructed at KAERI and it began test operation in 2012. The purpose of PRIDE is to test the process regarding unit process performance, remote operation of equipments, integration of unit processes, scale-up of process, process monitoring, argon environment system operation, and safeguards-related activities. The test of PRIDE will be promising for further pyroprocessing technology development.
102 citations
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TL;DR: Current research on materials is summarized and discussed and future directions for SIBs are proposed to provide important insights into scientific and practical issues in the development of S IBs.
Abstract: Energy production and storage technologies have attracted a great deal of attention for day-to-day applications. In recent decades, advances in lithium-ion battery (LIB) technology have improved living conditions around the globe. LIBs are used in most mobile electronic devices as well as in zero-emission electronic vehicles. However, there are increasing concerns regarding load leveling of renewable energy sources and the smart grid as well as the sustainability of lithium sources due to their limited availability and consequent expected price increase. Therefore, whether LIBs alone can satisfy the rising demand for small- and/or mid-to-large-format energy storage applications remains unclear. To mitigate these issues, recent research has focused on alternative energy storage systems. Sodium-ion batteries (SIBs) are considered as the best candidate power sources because sodium is widely available and exhibits similar chemistry to that of LIBs; therefore, SIBs are promising next-generation alternatives. Recently, sodiated layer transition metal oxides, phosphates and organic compounds have been introduced as cathode materials for SIBs. Simultaneously, recent developments have been facilitated by the use of select carbonaceous materials, transition metal oxides (or sulfides), and intermetallic and organic compounds as anodes for SIBs. Apart from electrode materials, suitable electrolytes, additives, and binders are equally important for the development of practical SIBs. Despite developments in electrode materials and other components, there remain several challenges, including cell design and electrode balancing, in the application of sodium ion cells. In this article, we summarize and discuss current research on materials and propose future directions for SIBs. This will provide important insights into scientific and practical issues in the development of SIBs.
3,009 citations
01 Nov 2000
TL;DR: In this paper, the authors compared the power density characteristics of ultracapacitors and batteries with respect to the same charge/discharge efficiency, and showed that the battery can achieve energy densities of 10 Wh/kg or higher with a power density of 1.2 kW/kg.
Abstract: The science and technology of ultracapacitors are reviewed for a number of electrode materials, including carbon, mixed metal oxides, and conducting polymers. More work has been done using microporous carbons than with the other materials and most of the commercially available devices use carbon electrodes and an organic electrolytes. The energy density of these devices is 3¯5 Wh/kg with a power density of 300¯500 W/kg for high efficiency (90¯95%) charge/discharges. Projections of future developments using carbon indicate that energy densities of 10 Wh/kg or higher are likely with power densities of 1¯2 kW/kg. A key problem in the fabrication of these advanced devices is the bonding of the thin electrodes to a current collector such the contact resistance is less than 0.1 cm2. Special attention is given in the paper to comparing the power density characteristics of ultracapacitors and batteries. The comparisons should be made at the same charge/discharge efficiency.
2,437 citations
TL;DR: A framework of digital transformation articulated across eight building blocks is built that foregrounds digital transformation as a process where digital technologies create disruptions triggering strategic responses from organizations that seek to alter their value creation paths while managing the structural changes and organizational barriers that affect the positive and negative outcomes of this process.
Abstract: Extant literature has increased our understanding of specific aspects of digital transformation, however we lack a comprehensive portrait of its nature and implications. Through a review of 282 works, we inductively build a framework of digital transformation articulated across eight building blocks. Our framework foregrounds digital transformation as a process where digital technologies create disruptions triggering strategic responses from organizations that seek to alter their value creation paths while managing the structural changes and organizational barriers that affect the positive and negative outcomes of this process. Building on this framework, we elaborate a research agenda that proposes [1] examining the role of dynamic capabilities, and [2] accounting for ethical issues as important avenues for future strategic IS research on digital transformation.
1,787 citations
TL;DR: The properties and synthesis methods of these carbon nanodots are reviewed and emphasis is placed on their biological (both fundamental and theranostic) applications.
Abstract: The emerging graphene quantum dots (GQDs) and carbon dots (C-dots) have gained tremendous attention for their enormous potentials for biomedical applications, owing to their unique and tunable photoluminescence properties, exceptional physicochemical properties, high photostability, biocompatibility, and small size. This article aims to update the latest results in this rapidly evolving field and to provide critical insights to inspire more exciting developments. We comparatively review the properties and synthesis methods of these carbon nanodots and place emphasis on their biological (both fundamental and theranostic) applications.
1,665 citations
TL;DR: In this paper, the performance characteristics of transition metal oxides based on the α-NaFeO 2, spinel and olivine structures have been compared and approaches for improving their performances have been proposed.
1,422 citations