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Seokho Suh,Sunghoon Han,Hocheol Yoon,Hyunsu Kim,Jisue Kang,Chanho Pak,Hyeong-Jin Kim 대한금속·재료학회 2022 ELECTRONIC MATERIALS LETTERS Vol.18 No.2
SiO 2 -based anodes have attracted extensive attention due to their high theoretical capacity of 1,956 mAh g -1 , stable cycle life, and abundance on Earth. However, their commercialization is still hindered by several intrinsic problems, such as poor electrical conductivity and electrochemical inactiveness. In this study, a 3-dimensional SiO 2 /C electrode is fabricated by introducing a pore-forming agent (polytetrafluoroethylene, PTFE) and partially carbonizing a polyvinylidene fluoride (PVDF) binder. During heat treatment at 600 °C, PTFE powders are unzipped to develop microsized pores. Meanwhile, the PVDF binder is partially carbonized to form highly conductive F-doped graphitic carbon. In particular, a highly porous platelet SBA-15 template is used as an SiO 2 active material for large contact areas between SiO 2 and carbonized PVDF. As a result, the structured SiO 2 /C anode exhibits better cycle performance and internal resistance than typical SiO 2 electrodes: the structured SiO2/C anode delivers 294 mAh g -1 , while the typical SiO 2 anode is electrochemically inactive with Li + ions.
Improving electrochemical performances of lithium-ion capacitors employing 3D structured Si anodes
Juyeon Baek,Seokho Suh,Hyunsu Kim,Hyeonghun Park,Santosh Kumar,Tomas Tamulevicius,Sigitas Tamulevicius,Hyeong-Jin Kim 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.126 No.-
Lithium-ion capacitors (LICs) are gaining attention from researchers as the demand for an energy storagedevice that addresses the drawbacks of lithium-ion batteries and supercapacitors is increasing. Silicon(Si) is a desirable anode material for LICs due to its high theoretical capacity and low working potential. However, Si experiences extreme volume changes of up to 300%, which cause a poor cycle life. To mitigatemechanical stress in Si anodes, we fabricated a three-dimensional structured Si electrode using a poreformingagent and evaluated its physical-electrochemical properties. The pore network of the structuredSi electrode effectively buffered the volume change, alleviating crack formation in the electrode andresulting in improved cycle stability. The LIC full cell using the structured Si had a high energy densityof 191.4 Wh kg1 at a power density of 723.7Wkg1. Our approach is compatible with conventional electrodefabrication systems and provides a cost-effective and practical method for pure Si anodes suitablefor use in LICs through a simple pore-structuring process.
Lee, Woonkyu,Kwak, Jinoh,Hwang, Jisun,Suh, Changkook,Cha, Seokho Korean Society for Molecular Biology 2008 Molecules and cells Vol.25 No.2
Single nucleotide polymorphisms (SNPs) are the most common form of human genetic variation. Non-synonymous SNPs (nsSNPs) change an amino acid. Organic anion transporters (OATs) play an important role in eliminating or reabsorbing endogenous and exogenous organic anionic compounds. Among OATs, hOAT4 mediates high affinity transport of estrone sulfate and dehydroepiandrosterone sulfate. The rapid bone loss that occurs in post-menopausal women is mainly due to a net decrease of estrogen. In the present study we searched for SNPs within the exon regions of hOAT4 in Korean women osteoporosis patients. Fifty healthy subjects and 50 subjects with osteoporosis were screened for genetic polymorphism in the coding region of SLC22A11 (hOAT4) using GC-clamp PCR and denaturing gradient gel electrophoresis (DGGE). We found three SNPs in the hOAT4 gene. Two were in the osteoporosis group (C483A and G832A) and one in the normal group (C847T). One of the SNPs, G832A, is an nsSNP that changes the 278<SUP>th</SUP> amino acid from glutamic acid to lysine (E278K). Uptake of [<SUP>3</SUP>H] estrone sulfate by oocytes injected with the hOAT4 E278K mutant was reduced compared with wild-type hOAT4. Km values for wild type and E278K were 0.7 μM and 1.2 μM, and Vmax values were 1.8 and 0.47 pmol/oocyte/h, respectively. The present study demonstrates that hOAT4 variants can causing inter-individual variation in anionic drug uptake and, therefore, could be used as markers for certain diseases including osteoporosis.
A dendrite-free anode for stable aqueous rechargeable zinc-ion batteries
Santosh Kumar,Hocheol Yoon,박형훈,Geumyong Park,Seokho Suh,김형진 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.108 No.-
Due to its low cost, high specific co, and environmental friendliness, zinc is considered a potential anodematerial for aqueous rechargeable Zn-ion batteries. However, practical applications remain a challengedue to uncontrolled dendrite formation. Herein, we have utilized a strategy where a microporous nanofiberlayer of polyacrylonitrile (PAN) is electrospun onto Cu foil and used as the current collector for theanode to inhibit dendrite generation. The polar nitrile groups on the nanofibers expedite the uniformtransport of Zn2+ and allow homogenous Zn deposition, which ultimately inhibits dendrite growth. Thesymmetrical cell equipped with this new fabricated electrode shows over 270 stable cycles without ashort circuit. The full cell formed with MnO2 as the cathode exhibits improved cycle stability up to300 cycles at a current density of 0.5 A g1.
( Hongsuk Choi ),( Subin Kim ),( Hayong Song ),( Seokho Suh ),( Hyeong-jin Kim ),( Kwangsup Eom ) 한국부식방식학회 2021 Corrosion Science and Technology Vol.20 No.5
In this work, we proposed a facile method to fabricate the three-dimensional porous copper current collector (3D Cu CC) for a Si-dominant anode in a Li-ion battery (LiB). The 3D Cu CC was prepared by combining chemical etching and thermal reduction from a planar copper foil. It had a porous layer employing micro-sized Cu balls with a large surface area. In particular, it had strengthened attachment of Si-dominant active material on the CC compared to a planar 2D copper foil. Moreover, the increased contact area between a Si-dominant active material and the 3D Cu could minimize contact loss of active materials from a CC. As a result of a battery test, Si-dominant active materials on 3D Cu showed higher cyclic performance and rate-capability than those on a conventional planar copper foil. Specifically, the Si electrode employing 3D Cu exhibited an areal capacity of 0.9 mAh cm<sup>-2</sup> at the 300<sup>th</sup> cycles (@ 1.0 mA cm<sup>-2</sup>), which was 5.6 times higher than that on the 2D copper foil (0.16 mAh cm<sup>-2</sup>).