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Revealing the influence of in-situ formed LiCl on garnet/Li interface for dendrite-free solid-state batteries

Journal of Energy Chemistry 2024年第5期92卷 394-403页

作者： Seoyoon Shin Jinuk lee tae Ho Shin Seokhee lee Hydrogen Energy Materials Center Korea Institute of Ceramic Engineering&TechnologyJinju-siGyeongsangnam-do 52851Republic of Korea Department of Materials Science and Engineering Yonsei UniversitySeoul 03722Republic of Korea

Inadequate interfacial contact between lithium and solid-state electrolytes(SSEs)leads to elevated impedance and the growth of lithium dendrites,presenting significant obstacles to the practical viability of solid-state batteries(SSBs).To ameliorate interfacial contact,optimizing the surface treatment of SSEs has been widely ***,the formation of LiCl through acid treatment,an equally crucial factor impacting SSB performance,has received limited attention,leaving its underlying mechanism *** study aims to shed light on SSE characteristics following LiCl formation and the removal of Li_(2)CO_(3) through acid *** seek to establish quantifiable links between SSE surface structure and SSB performance,focusing on interfacial resistance,current distribution,critical current density(CCD),and lithium *** formation of LiCl,occurring as Li_(2)CO_(3) is removed through acid treatment,effectively mitigates lithium dendrite formation on SSE *** action inhibits electron injection and reduces the diffusion rate of Li ***,acid treatment transforms the SSE surface into a lithiophilic state by eliminating surface Li_(2)CO_(3).Consequently,the interfacial resistance between lithium and SSEs substantially decreases from 487.67 to 35.99Ωcm^(2) at 25°*** leads to a notably high CCD of 1.3 mA cm^(-2) and a significantly extended cycle life of 1,000 ***,in full SSBs incorporating LiCoO_(2)cathodes and acid-treated garnet SSEs,we observe exceptional cyclability and rate *** findings highlight that acid treatment not only establishes a fundamental relationship between SSE surfaces and battery performance but also offers an effective strategy for addressing interfacial challenges in SSBs.

关键词： Solid-statebatteries Acidtreatment Interfacial stability LiCl Surface modification

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Prediction of Monthly Mean Surface Air Temperature in a Region of China

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Advances in Atmospheric Sciences 2007年第3期24卷 503-508页

作者： Jeong-Hyeong lee Keon-tae SOHN Division of Management Information Science Dong-A University Busan 604-714Korea Department of Statistics Pusan National University Busan 609-735Korea

In conventional time series analysis, a process is often modeled as three additive components： linear trend, seasonal effect, and random noise. In this paper, we perform an analysis of surface air temperature in a region of China using a decomposition method in time series analysis. Applications to the National Centers for Environmental Prediction/the National Center for Atmospheric Research （NCEP/NCAR） Collaborative Reanalysis data in this region of China are discussed. The main finding was that the surface air temperature trend estimated for January 1948 to February 2006 was not statistically significant at 0.5904℃ （100 yr）^-1. Forecasting aspects are also considered.

关键词： Chinese region surface air temperature time series decomposition method regression

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Common bile duct stones on multidetector computed tomography:Attenuation patterns and detectability

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World Journal of Gastroenterology 2013年第11期19卷 1788-1796页

作者： Chang Whan Kim Jae Hyuck Chang Yeon Soo Lim tae Ho Kim In Seok lee Sok won Han Department of Internal Medicine College of MedicineThe Catholic University of Korea505 BanpoDongSeocho-GuSeoul 137-701South Korea Department of Radiology College of MedicineThe Catholic University of Korea505 Banpo-DongSeocho-GuSeoul 137-701South Korea

AIM:To investigate the attenuation patterns and detectability of common bile duct(CBD) stones by multidetector computed tomography(MDCT).METHODS:Between March 2010 and February 2012,191 patients with suspicion of CBD stones undergoing both MDCT and endoscopic retrograde cholangiopancreatography(ERCP) were enrolled and reviewed *** attenuation patterns of CBD stones on MDCT were classified as heavily calcified,radiopaque,less radiopaque,or *** association between the attenuation patterns of CBD stones on MDCT and stone type consisting of pure cholesterol,mixed cholesterol,brown pigment,and black pigment and the factors related to the detectability of CBD stones by MDCT were ***:MDCT showed CBD stones in 111 of 130 patients in whom the CBD stones were demonstrated by ERCP with 85.4% *** attenuation patterns of CBD stones on MDCT were heavily calcified 34(26%),radiopaque 31(24%),less radiopaque 46(35%),and undetectable 19(15%).The radiopacity of CBD stones differed significantly according to stone type(P < 0.001).From the receiver operating characteristic curve,stone size was useful for the determination of CBD stone by MDCT(area under curve 0.779,P < 0.001) and appropriate cut-off stone size on MDCT was 5 *** factors related to detectability of CBD stones on MDCT were age,stone type,and stone size on multivariate analysis(P < 0.05).CONCLUSION:The radiopacity of CBD stones on MDCT differed according to stone *** type and stone size were related to the detectability by MDCT,and appropriate cut-off stone size was 5 mm.

关键词： Common bile duct gallstones Gallstones Multidetector computed tomography Endoscopic retrograde cholangiography

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Homeostasis and regulation of autoreactive B cells

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Cellular & Molecular Immunology 2020年第6期17卷 561-569页

作者： Sujin lee Yeunjung Ko tae Jin Kim Department of Immunology Sungkyunkwan University School of MedicineSuwon 16419Republic of Korea

In contrast to the previous belief that autoreactive B cells are eliminated from the normal repertoire of B cells,many autoreactive B cells actually escape clonal deletion and develop into mature B *** autoreactive B cells in healthy individuals perform some beneficial functions in the host and are homeostatically regulated by regulatory T and B cells or other mechanisms to prevent autoimmune *** B-1 cells constitutively produce polyreactive natural antibodies for tissue ***,autoreactive follicular B cells were reported to participate actively in the germinal center ***,the selection and usefulness of autoreactive marginal zone(MZ)B cells found in autoimmune diseases are not well understood,although the repertoire of MZ B-cell receptors(BCRs)is presumed to be biased to detect bacterial *** this review,we discuss the autoreactive B-cell populations among all three major B-cell subsets and their regulation in immune responses and diseases.

关键词： B-cell autoreactivity polyreactivity autoreactive antibody B-cell receptor B-1 lymphocyte autoreactive germinal center autoreactive marginal zone B cell

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Gate-versus defect-induced voltage drop and negative differential resistance in vertical graphene heterostructures

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npj Computational Materials 2022年第1期8卷 480-488页

作者： tae Hyung Kim Juho lee Ryong-Gyu lee Yong-Hoon Kim School of Electrical Engineering Korea Advanced Institute of Science and Technology(KAIST)291 Daehak-roYuseong-guDaejeon34141Korea

To enable the computer-aided design of vertically stacked two-dimensional(2D)van der Waals(vdW)heterostructure devices,we here introduce a non-equilibrium first-principles simulation method based on the multi-space constrained-search density functional *** it to graphene/few-layer hBN/graphene field-effect transistors,we show that the negative differential resistance(NDR)characteristics can be produced not only from the gating-induced mismatch between two graphene Dirac cones in energy-momentum space but from the bias-dependent energetic shift of defect ***,for a carbon atom substituted for a nitrogen atom(C_(N))within inner hBN layers,the increase of bias voltage is found to induce a self-consistent electron filling of in-gap C_(N)states,which in turn changes voltage drop profiles and produces symmetric NDR *** the CN placed on outer hBN layers,however,the pinning of C_(N)states to nearby graphene significantly modifies device characteristics,demonstrating the critical impact of atomic details for 2D vdW devices.

关键词： defect resistance details

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Electrochemically metal-doped reduced graphene oxide films:Properties and applications

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Journal of Materials Science & Technology 2020年第5期40卷 72-80页

作者： Myung-Sic Chae tae Ho lee Kyung Rock Son tae Hoon Park Kyo Seon Hwang tae Geun Kim School of Electrical Engineering Korea UniversityAnam-ro 145Seongbuk-guSeoul 02841South Korea Department of Clinical Pharmacology and Therapeutics College of MedicineKyung Hee UniversitySeoul 02447South Korea

The fine control of doping levels in graphene materials such as reduced graphene oxide(RGO)is important to properly manipulate their ambipolar transport characteristics for various device ***,conventional doping methods involve complex chemical reactions,large-scale doping processes,and poor ***,a simple and controllable electrochemical doping treatment(EDT),performed via the conductive channels created at the RGO surface by the application of an electric field,is introduced to tailor the electrical properties of RGO films.X-ray photoelectron spectroscopy and Raman spectroscopy measurements are performed to detect the presence of Ni atoms in RGO films after the EDT(EDT-RGO).Then,EDT-RGO field-effect transistors(FETs)are fabricated with different doping areas(0 to 100%fractional area)on the RGO active channel to investigate the effect and selective-area doping capability of the *** to p-type doping compensation by the intercalated Ni atoms,the electron mobility of the EDT-RGO FET decreases from 1.40 to 0.12 cm2 V-1s-1 compared with that of the undoped RGO-FET,leading to the conversion from ambipolar to unipolar p-type transfer characteristics.

关键词： Reduced graphene oxide Electrochemical doping treatment Electrical breakdown process Field-effect transistor

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Ampullary neuroendocrine tumor diagnosed by endoscopic papillectomy in previously confirmed ampullary adenoma

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World Journal of Gastroenterology 2016年第13期22卷 3687-3692页

作者： Seoung Ho lee tae Hoon lee Si-Hyong Jang Chi Young Choi won Myung lee Ji Hey Min Hyun Deuk Cho Sang-Heum Park Division of Gastroenterology Department of Internal Medicine Soonchunhyang University College of Medicine Cheonan Hospital Department of Pathology Soonchunhyang University College of Medicine Cheonan Hospital

Ampullary adenoma is a common indication for endoscopic papillectomy. Ampullary neuroendocrine tumor(NET) is a rare disease for which complete surgical resection is the treatment of choice. However, because of the morbidity and mortality associated with surgical resection, endoscopic papillectomy is increasingly used in selected cases of low grade, with no metastasis and no invasion of the pancreatic or bile duct. Also, confirmed and complete endoscopic resection of ampullary NET accompanied by adenoma has not been reported to date. We report herein a rare case of an ampullary NET accompanied with adenoma, which was successfully and completely resected via endoscopic papillectomy. Prior to papillectomy, this case was diagnosed as an ampullary adenoma.

关键词： Ampulla of Vater Neuroendocrine tumor Adenoma Papillectomy

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Interface engineering of an electrospun nanofiber-based composite cathode for intermediate-temperature solid oxide fuel cells

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International Journal of Extreme Manufacturing 2023年第1期5卷 345-353页

作者： Seo Ju Kim Deokyoon Woo Donguk Kim tae Kyeong lee Jaeyeob lee wonyoung lee School of Mechanical Engineering Sungkyunkwan UniversitySuwonKyunggi-do 16419Republic of Korea SKKU Institute of Energy Science and Technology(SIEST) Sungkyunkwan UniversitySuwon 16419Republic of Korea

Sluggish oxygen reduction reaction(ORR)kinetics are a major obstacle to developing intermediate-temperature solid-oxide fuel cells(IT-SOFCs).In particular,engineering the anion defect concentration at an interface between the cathode and electrolyte is important for facilitating ORR kinetics and hence improving the electrochemical *** developed the yttria-stabilized zirconia(YSZ)nanofiber(NF)-based composite cathode,where the oxygen vacancy concentration is controlled by varying the dopant cation(Y2O3)ratio in the YSZ *** composite cathode with the optimized oxygen vacancy concentration exhibits maximum power densities of 2.66 and 1.51 W cm^(−2)at 700 and 600℃,respectively,with excellent thermal stability at 700℃ over 500 h under 1.0 A cm^(−2).Electrochemical impedance spectroscopy and distribution of relaxation time analysis revealed that the high oxygen vacancy concentration in the NF-based scaffold facilitates the charge transfer and incorporation reaction occurred at the interfaces between the cathode and *** results demonstrate the high feasibility and potential of interface engineering for achieving IT-SOFCs with higher performance and stability.

关键词： solid oxide fuel cells nanofiber infiltration oxygen reduction reactions oxygen vacancy

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Multifunctional Ir–Ru alloy catalysts for reversal-tolerant anodes of polymer electrolyte membrane fuel cells

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Journal of Materials Science & Technology 2021年第1期60卷 105-112页

作者： Seung Woo lee Bongho lee Chaekyung Baik tae-Yang Kim Chanho Pak Graduate Program of Energy Technology School of Integrated TechnologyInstitute of Integrated TechnologyGwangju Institute of Science and TechnologyGwangju 61005Republic of Korea Research Institute for Solar and Sustainable Energies Gwangju Institute of Science and TechnologyGwangju 61005Republic of Korea

To address the problem of fuel starvation in fuel-cell electric vehicles,which causes cell voltage reversal and results in cell failure when repeated continuously,we developed a reversal-tolerant anode(RTA) to promote water oxidation in preference to carbon *** carbon-supported Ir-Ru alloys with different compositions are employed as RTA catalysts in an acidic polyol solution and are shown to exhibit composition-dependent average crystallite sizes of <5.33 *** adopted approach allows the generation of relatively well-dispersed Ir-Ru alloy nanoparticles on the carbon support without severe *** activity of IrRu_(2)/C for the hydrogen oxidation reaction is 1.10 times that of the stateof-the-art Pt/C *** reversal testing by simulation of fuel starvation reveals that the durability of IrRu_(2)/C(~7 h) significantly exceeds that of the conventional Pt/C catalyst(~10 min) and is the highest value reported so ***,the developed Ir-Ru alloy catalyst can be used to fabricate practical RTAs and replace Pt catalysts in the anodes of polymer electrolyte membrane fuel cells.

关键词： Polymer electrolyte membrane fuel cell Polyol process Reversal-tolerant anode Oxygen evolution reaction Hydrogen oxidation reaction

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Effect of electrical stimulation on neural regeneration via the p38-RhoA and ERK1/2-Bcl-2 pathways in spinal cord-injured rats

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Neural Regeneration Research 2018年第2期13卷 340-346页

作者： Min Cheol Joo Chul Hwan Jang Jong tae Park Seung won Choi Seungil Ro Min Seob Kim Moon Young lee Department of Rehabilitation Medicine and Institute of wonkwang Medical Science School of Medicine Wonkwang University Department of Neurosurgery School of Medicine Wonkwang University Department of Anesthesiology and Pain Medicine School of Medicine Wonkwang University Department of Physiology and Cell Biology School of Medicine University of Nevada Department of Physiology and Institute of wonkwang Medical Science School of Medicine Wonkwang University

Although electrical stimulation is therapeutically applied for neural regeneration in patients, it remains unclear how electrical stimulation exerts its effects at the molecular level on spinal cord injury （SCI）. To identify the signaling pathway involved in electrical stimulation improving the function of injured spinal cord, 21 female Sprague-Dawley rats were randomly assigned to three groups： control （no surgical intervention, n = 6）, SCI （SCI only, n = 5）, and electrical simulation （ES; SCI induction followed by ES treatment, n = 10）. A complete spinal cord transection was performed at the 10^th thoracic level. Electrical stimulation of the injured spinal cord region was applied for 4 hours per day for 7 days. On days 2 and 7 post SCI, the Touch-Test Sensory Evaluators and the Basso-Beattie-Bresnahan locomotor scale were used to evaluate rat sensory and motor function. Somatosensory-evoked potentials of the tibial nerve of a hind paw of the rat were measured to evaluate the electrophysiological function of injured spinal cord. Western blot analysis was performed to measure p38-RhoA and ERK1/2-Bcl-2 pathways related protein levels in the injured spinal cord. Rat sensory and motor functions were similar between SCI and ES groups. Com- pared with the SCI group, in the ES group, the latencies of the somatosensory-evoked potential of the tibial nerve of rats were significantly shortened, the amplitudes were significantly increased, RhoA protein level was significantly decreased, protein gene product 9.5 expression, ERK1/2, p38, and Bcl-2 protein levels in the spinal cord were significantly increased. These data suggest that ES can promote the recovery of electrophysiological function of the injured spinal cord through regulating p38-RhoA and ERK1/2-Bcl-2 pathway-related protein levels in the injured spinal cord.

关键词： Bcl-2 ERKI/2 p38 PGP9.5 RhoA spinal cord injury somatosensory evoked potential muscle contraction electrical impulses neural regeneration

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