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Multicomponent Silicate Cathode Materials for Rechargeable Li-Ion Batteries: An Ab Initio Study
Longo, R. C.,Xiong, K.,Cho, K. The Electrochemical Society 2013 Journal of the Electrochemical Society Vol.160 No.1
<P>A first principles investigation is performed to study the structural and electrochemical properties of new multicomponent silicate materials that can be suitable for the cathode of rechargeable Li-ion batteries. The distribution of different transition metals in the silicate structure alters the structural and electronic properties of the crystal, affecting its kinetics, redox potentials and both ionic and electronic conductivities. We also explain the effect of the multiple interactions between Li ions and the transition metals. These multicomponent structures represent a very powerful strategy to control the electrochemical performance of the silicates. In this work, we finally address the implications of such strategy on the design of Li-ion batteries.</P>
Longo, Roberto C.,Liang, Chaoping,Kong, Fantai,Cho, Kyeongjae American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.22
<P>The structural stability of Li-rich layered oxide cathode materials is the ultimate frontier to allow the full development of these family of electrode materials. Here, first-principles calculations coupled with cluster expansion are presented to investigate the electrochemical activity of phase-separation, core-shell-structured <I>x</I>Li<SUB>2</SUB>MnO<SUB>3</SUB>·(1 - <I>x</I>)LiNiCoMnO<SUB>2</SUB> nanocomposites. The detrimental surface effects of the core region can be countered by the Li<SUB>2</SUB>MnO<SUB>3</SUB> shell, which stabilizes the nanocomposites. The operational voltage windows are accurately determined to avoid the electrochemical activation of the shell and the subsequent structural evolution. In particular, the dependence of the activation voltage with the shell thickness shows that relatively high voltages can still be obtained to meet the energy density needs of Li-ion battery applications. Finally, activation energies of Li migration at the core-shell interface must also be analyzed carefully to avoid the outbreak of a phase transformation, thus making the nanocomposites suitable from a structural viewpoint.</P> [FIG OMISSION]</BR>
ANALYSIS OF AN ABSORPTION CHILLER DRIVEN BY THE HEAT RECOVERY ON A SOLID OXIDE FUEL CELL
Longo, Giovanni A.,Baggio, Paoli The Society of Air-Conditioning and Refrigerating 2010 International Journal Of Air-Conditioning and Refr Vol.18 No.3
This paper studies an absorption machine driven by the heat recovered from a Solid Oxide Fuel Cell (SOFC). The absorption unit was first evaluated by a cycle analysis determining the sensitivity to the main boundary conditions and to the internal parameters. Then a specific simulation code of all the different devices of the absorption machine was developed to evaluate the performance and size of the unit together with its operating condition limits.
Tábata Longo da Silva Machado,Alysson Zanatta,Larissa Gonçalves Braz Santos,Rafaella Ferreira de Araújo Litvin,Lizandra Moura Paravidine Sasaki,Júlio Elito Júnior,Edward Araujo Júnior,Alberto Moreno Z 대한산부인과학회 2019 Obstetrics & Gynecology Science Vol.62 No.6
The objective of this study was to evaluate the feasibility of posterior colpotomy for the surgical treatment oftubal ectopic pregnancy in hemodynamically stable women. We performed a retrospective analysis of medicalrecords obtained over a period of 18 months. Twelve cases were identified, with the following characteristics: meangestational age, 7.7 weeks; mean serum β-human chorionic gonadotropin level, 7,786 mIU/mL; and greater diameterof the mass, 15–69 mm. Treatment was successful in all cases. Salpingectomy was performed in 10 patients (83.3%)and salpingostomy, in 1 patient. The remaining patient only received peritoneal lavage, as the evidence of ectopicabortion with only a slightly dilated uterine tube was found during surgery. The mean surgical time was 42.5 minutes. In the analyzed cases, posterior colpotomy was found to be a feasible alternative method for the surgical treatmentof tubal ectopic pregnancy in hemodynamically stable women.
ANALYSIS OF AN ABSORPTION CHILLER DRIVEN BY THE HEAT RECOVERY ON A SOLID OXIDE FUEL CELL
GIOVANNI A. LONGO,PAOLO BAGGIO 대한설비공학회 2010 International Journal Of Air-Conditioning and Refr Vol.18 No.3
This paper studies an absorption machine driven by the heat recovered from a Solid Oxide Fuel Cell (SOFC). The absorption unit was first evaluated by a cycle analysis determining the sensitivity to the main boundary conditions and to the internal parameters. Then a specific simulation code of all the different devices of the absorption machine was developed to evaluate the performance and size of the unit together with its operating condition limits.
Charge-transfer modified embedded atom method dynamic charge potential for Li–Co–O system
Kong, Fantai,Longo, Roberto C,Liang, Chaoping,Nie, Yifan,Zheng, Yongping,Zhang, Chenxi,Cho, Kyeongjae Institute of Physics 2017 Journal of Physics, Condensed Matter Vol.29 No.47
<P>To overcome the limitation of conventional fixed charge potential methods for the study of Li-ion battery cathode materials, a dynamic charge potential method, charge-transfer modified embedded atom method (CT-MEAM), has been developed and applied to the Li–Co–O ternary system. The accuracy of the potential has been tested and validated by reproducing a variety of structural and electrochemical properties of LiCoO<SUB>2</SUB>. A detailed analysis on the local charge distribution confirmed the capability of this potential for dynamic charge modeling. The transferability of the potential is also demonstrated by its reliability in describing Li-rich Li<SUB>2</SUB>CoO<SUB>2</SUB> and Li-deficient LiCo<SUB>2</SUB>O<SUB>4</SUB> compounds, including their phase stability, equilibrium volume, charge states and cathode voltages. These results demonstrate that the CT-MEAM dynamic charge potential could help to overcome the challenge of modeling complex ternary transition metal oxides. This work can promote molecular dynamics studies of Li ion cathode materials and other important transition metal oxides systems that involve complex electrochemical and catalytic reactions.</P>
Modular Approach to Ultra-fast Charging Stations
Leone Carola,Longo Michela 대한전기학회 2021 Journal of Electrical Engineering & Technology Vol.16 No.4
Road transport electrifi cation is essential for meeting the European Union’s goals of decarbonization and climate change. In this context, an Ultra-Fast Charging (UFC) system is deemed necessary to facilitate the massive penetration of Electric Vehicles (EVs) on the market; particularly as medium-long distance travels are concerned. Anyway, an ultra-fast charging infrastructure represents the most critical point as regards hardware technology, grid-related issues, and fi nancial sustainability. Thus far, this paper presents an impact analysis of a fast-charging station on the grid in terms of power consumption, obtained by the Monte Carlo simulation. Simulation results show that it is not economical convenient size the assumed ultrafast charging station for the maximum possible power also considering its high impact on the grid. In view of the results obtained from the impact analysis, the last part of the paper focuses on fi nding a method to reduce the power installed for the DC/DC stage while keeping the possibility for the electric vehicle to charge at their maximum power. To achieve this goal a modular approach is proposed. Finally, two diff erent modular architectures are presented and compared. In both the solutions, the probability of having EVs charging at limited power is less than 5%. Road transport electrification is essential for meeting the European Union's goals of decarbonization and climate change. In this context, an Ultra-Fast Charging (UFC) system is deemed necessary to facilitate the massive penetration of Electric Vehicles (EVs) on the market; particularly as medium-long distance travels are concerned. Anyway, an ultra-fast charging infrastructure represents the most critical point as regards hardware technology, grid-related issues, and financial sustainability. Thus far, this paper presents an impact analysis of a fast-charging station on the grid in terms of power consumption, obtained by the Monte Carlo simulation. Simulation results show that it is not economical convenient size the assumed ultra-fast charging station for the maximum possible power also considering its high impact on the grid. In view of the results obtained from the impact analysis, the last part of the paper focuses on finding a method to reduce the power installed for the DC/DC stage while keeping the possibility for the electric vehicle to charge at their maximum power. To achieve this goal a modular approach is proposed. Finally, two different modular architectures are presented and compared. In both the solutions, the probability of having EVs charging at limited power is less than 5%.
Inositol polyphosphate multikinase mediates extinction of fear memory
Park, Jina,Longo, Francesco,Park, Seung Ju,Lee, Seulgi,Bae, Mihyun,Tyagi, Richa,Han, Jin-Hee,Kim, Seyun,Santini, Emanuela,Klann, Eric,Snyder, Solomon H. National Academy of Sciences 2019 Proceedings of the National Academy of Sciences Vol.116 No.7
<P><B>Significance</B></P><P>Inositol polyphosphate multikinase (IPMK) is a pleiotropic enzyme for the biosynthesis of inositol polyphosphates and phosphatidylinositol 3,4,5-trisphosphate, but the neural function of IPMK has remained largely elusive. By conditionally deleting IPMK from the excitatory neurons of the postnatal forebrain in mice, we found that IPMK knockout mice exhibited normal cued fear conditioning but showed enhanced fear extinction accompanied by selective activation of p85 S6 kinase 1 in the IPMK-null amygdala following fear extinction. Electrophysiological recording analyses further uncovered facilitated hippocampal long-term potentiation from IPMK knockout mice. Thus, our data propose IPMK as a molecular player in the control of fear extinction.</P><P>Inositol polyphosphate multikinase (IPMK), the key enzyme for the biosynthesis of higher inositol polyphosphates and phosphatidylinositol 3,4,5<I>-</I>trisphosphate, also acts as a versatile signaling player in regulating tissue growth and metabolism. To elucidate neurobehavioral functions of IPMK, we generated mice in which IPMK was deleted from the excitatory neurons of the postnatal forebrain. These mice showed no deficits in either novel object recognition or spatial memory. IPMK conditional knockout mice formed cued fear memory normally but displayed enhanced fear extinction. Signaling analyses revealed dysregulated expression of neural genes accompanied by selective activation of the mechanistic target of rapamycin (mTOR) regulatory enzyme p85 S6 kinase 1 (S6K1) in the amygdala following fear extinction. The IPMK mutants also manifested facilitated hippocampal long-term potentiation. These findings establish a signaling action of IPMK that mediates fear extinction.</P>