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Kim, Hyeri,Kim, Jongsoon,Jeong, Hee-Sung,Kim, Hyungsub,Lee, Hoyeon,Ha, Jae-Min,Choi, Sung-Min,Kim, Tae-Ho,Nah, Yoon-Chae,Shin, Tae Joo,Bang, Joona,Satija, Sushil K.,Koo, Jaseung The Royal Society of Chemistry 2018 Chemical communications Vol.54 No.41
<P>We demonstrate that hybrid structures of graphene and single-walled carbon nanotubes (SWNTs) are precisely controlled at the liquid-gas interface. The functionalized SWNT Langmuir monolayers anchor single-layer graphene nanosheets (GNSs) suspended in water <I>via</I> Coulomb interaction at the interface. This GNS/SWNT hybrid multilayer electrode can be a promising anode material for Li-ion batteries, offering high specific capacity, outstanding power capability, and excellent cyclability.</P>
Kim, Jongsoon,Lee, Byungju,Kim, Hyungsub,Kim, Hyunah,Kang, Kisuk American Chemical Society 2016 Chemistry of materials Vol.28 No.19
<P>Defects in crystals such as antisites generally lead-to the deterioration of the ionic conductivity of solid-state ionic conductors. Herein, using first principles calculations, we demonstrate that the Li diffusion in Li2MP2O7 (M = Fe or Mn), a promising battery material, is sensitively affected by the presence of Li/M antisites; however, unexpectedly, the antisites significantly promote Li diffusion. The calculations reveal that the presence of antisites reduces the barrier of Li hopping and opens new paths for Li diffusion in the Li2MP2O7 crystal. In our experimental verification, we succeeded in synthesizing crystalline Li2MnP2O7 with varying Li/Mn antisite contents and demonstrated that the inclusion of antisites results in improved power capability with faster Li diffusion for Li-ion battery electrodes. We believe that this unexpected finding of increasing the ionic conductivity by introducing antisite defects broadens our understanding of solid-state ionic conductors and provides a new strategy for improving Li diffusion in conventional electrode materials for Li rechargeable batteries.</P>
Kim, Jongsoon,Kim, Hyungsub,Myung, Seung-Taek,Yoo, Jung-Keun,Lee, Seongsu Elsevier Sequoia 2018 Journal of Power Sources Vol. No.
<P><B>Abstract</B></P> <P>Mn-rich olivine LiFe<SUB>0.3</SUB>Mn<SUB>0.7</SUB>PO<SUB>4</SUB> is homogenously encapsulated by an ∼3-nm-thick conductive nanolayer composed of the glassy lithium fluorophosphate through simple non-stoichiometric synthesis using additives of small amounts of LiF and a phosphorus source. The coating of the glassy lithium fluorophosphate nanolayer is clearly verified using transmission electron microscopy and X-ray photoelectron spectroscopy. It enables significant decrease in charge transfer resistance of LiFe<SUB>0.3</SUB>Mn<SUB>0.7</SUB>PO<SUB>4</SUB> and improvement of its sluggish Li diffusion. At a rate of 10C, the LiFe<SUB>0.3</SUB>Mn<SUB>0.7</SUB>PO<SUB>4</SUB> encapsulated by conductive glassy lithium fluorophosphate (LiFe<SUB>0.3</SUB>Mn<SUB>0.7</SUB>PO<SUB>4</SUB>-GLFP) electrode delivers a capacity of ∼130 mAh g<SUP>−1</SUP>, which is ∼77% of its theoretical capacity (∼170 mAh g<SUP>−1</SUP>) and ∼1.5 times higher than that of the pristine counterpart at 10C. Furthermore, LiFe<SUB>0.3</SUB>Mn<SUB>0.7</SUB>PO<SUB>4</SUB>-GLFP achieves outstanding cycle stability (∼75% retention of its initial capacity over 500 cycles at 1C). The proposed olivine LiFe<SUB>0.3</SUB>Mn<SUB>0.7</SUB>PO<SUB>4</SUB>-GLFP battery is thus expected to be a promising candidate for large-scale energy storage applications.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Simple coating of glassy lithium fluorophosphates. </LI> <LI> Excellent power capability (∼130 mAh g<SUP>−1</SUP> at 10C). </LI> <LI> Great cyclability (∼75% retention of its initial capacity over 500 cycles at 1C). </LI> </UL> </P>
Development of Soil Moisture Controlling System for Smart Irrigation System
Jongsoon Kim(김종순),Won-Sik Choi(최원식),Ki-Yeol Jung(정기열),Sanghun Lee(이상훈),Jong Min Park(박종민),Soon Gu Kwon(권순구),Dong-Hyun Kim(김동현),Soon Hong Kwon(권순홍) 한국산업융합학회 2018 한국산업융합학회 논문집 Vol.21 No.5
The smart irrigation system using ICT technology is crucial for stable production of upland crops. The objective of this study was to develop a smart irrigation system that can control soil water, depending on irrigation methods, in order to improve crop production. In surface irrigation, three irrigation methods (sprinkler irrigation (SI), surface drip irrigation (SDI), and fountain irrigation (FI)) were installed on a crop field. The soil water contents were measured at 10, 20, 30, and 40 cm depth, and an automatic irrigation system controls a valve to maintain the soil water content at 10 cm to be 30%. In subsurface drip irrigation (SSDI), the drip lines were installed at a depth of 20 cm. Controlled drainage system (CDS) was managed with two ground water level (30 cm and 60 cm). The seasonal irrigation amounts were 96.4 ton/10a (SDI), 119.5 ton/10a (FI), and 113 ton/10a (SI), respectively. Since SDI system supplied water near the root zone of plants, the water was saved by 23.9% and 17.3%, compared with FI and SI, respectively. In SSDI, the mean soil water content was 38.8%, which was 10.8% higher than the value at the control treatment. In CDS, the water contents were greatly affected by the ground water level; the water contents at the surface zone with 30 cm ground water level was 9.4% higher than the values with 60 cm ground water level. In conclusion, this smart irrigation system can reduce production costs of upland crops.
LiFePO<sub>4</sub> with an alluaudite crystal structure for lithium ion batteries
Kim, Jongsoon,Kim, Hyungsub,Park, Inchul,Park, Young-Uk,Yoo, Jung-Keun,Park, Kyu-Young,Lee, Seongsu,Kang, Kisuk The Royal Society of Chemistry 2013 Energy & environmental science Vol.6 No.3
<P>A novel Na-pillared LiFePO<SUB>4</SUB> with an alluaudite structure is reported and its structure is investigated. The alluaudite-LiFePO<SUB>4</SUB> allowed fast lithium diffusion with stable electrochemical cycling in lithium batteries. ∼0.8 Li<SUP>+</SUP> could be extracted and reinserted reversibly for extended cycles <I>via</I> one-phase reaction in contrast to the well-known two-phase reaction in olivine-LiFePO<SUB>4</SUB>.</P> <P>Graphic Abstract</P><P>The novel alluaudite-LiFePO<SUB>4</SUB> allows fast lithium diffusion with stable electrochemical cycling as a cathode in lithium batteries. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c3ee24393a'> </P>
Kim, Sung‐,Wook,Seo, Dong‐,Hwa,Gwon, Hyeokjo,Kim, Jongsoon,Kang, Kisuk WILEY‐VCH Verlag 2010 Advanced Materials Vol.22 No.46
<P><B>Nanoarchitectures composed of FeF<SUB>3</SUB> nanoflowers on carbon nanotube (CNT) branches</B> (FNCB, see figure) are fabricated by functionalization of CNT surfaces with FeF<SUB>3</SUB>. FNCB’s improved Li‐ion and electron transport makes it a candidate for applications in cathode material for lithium rechargeable batteries. </P>
New 4V-Class and Zero-Strain Cathode Material for Na-Ion Batteries
Kim, Jongsoon,Yoon, Gabin,Lee, Myeong Hwan,Kim, Hyungsub,Lee, Seongsu,Kang, Kisuk American Chemical Society 2017 Chemistry of materials Vol.29 No.18
<P>Here, we introduce Na<SUB>3</SUB>V(PO<SUB>3</SUB>)<SUB>3</SUB>N as a novel 4V-class and zero-strain cathode material for Na-ion batteries. Structural analysis based on a combination of neutron and X-ray diffraction (XRD) reveals that the Na<SUB>3</SUB>V(PO<SUB>3</SUB>)<SUB>3</SUB>N crystal contains three-dimensional channels that are suitable for facile Na diffusion. The Na (de)intercalation is observed to occur at ∼4 V vs Na/Na<SUP>+</SUP> in the Na cell via the V<SUP>3+</SUP>/V<SUP>4+</SUP> redox reaction with ∼67% retention of the initial capacity after over 3000 cycles. The remarkable cycle stability is attributed to the near-zero volume change (∼0.24%) and unique centrosymmetric distortion that occurs during a cycle despite the large ionic size of Na ions for (de)intercalation, as demonstrated by <I>ex situ</I> XRD analysis and first-principles calculations. We also demonstrate that the Na<SUB>3</SUB>V(PO<SUB>3</SUB>)<SUB>3</SUB>N electrode can display outstanding power capability with ∼84% of the theoretical capacity retained at 10C, even though the particle sizes are on the micrometer scale (>5 μm), which is attributed to its intrinsic three-dimensional open-crystal framework. The combination of this high power capability and extraordinary cycle stability makes Na<SUB>3</SUB>V(PO<SUB>3</SUB>)<SUB>3</SUB>N a new potential cathode material for Na-ion batteries.</P> [FIG OMISSION]</BR>