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Multi-Phase Li-Mn-O Nanocomposite Synthesized by Oxidation Reaction for Lithium Ion Batteries
Song, Jinju,Lim, Jinsub,Yang, Juhyun,Kim, Sungjin,Jo, Jeonggeun,Heo, Kookjin,Ahn, Docheon,Kim, Jaekook Electrochemical Society 2017 Journal of the Electrochemical Society Vol.164 No.4
<P>A multi-phase Li-Mn-O nanocomposite, xLi(4)Mn(5)O(12)center dot yLiMn(2)O(4)center dot zLi(2)MnO(3), is synthesized via an oxidation reaction by controlling the molar ratio of Li and Mn in the LixMnyOz center dot nH(2)O precipitate. Synchrotron X-ray diffraction and high-resolution transmission electron microscopy confirm the constitution of the multi-phase nanocomposite as Li4Mn5O12, LiMn2O4, and Li2MnO3. The electrochemical measurements demonstrate that this nanocomposite cathode exhibits a discharge capacity of 196.8 mAh/g at 14.2 mA/g of current density with the characteristic profiles typical of layered structure as well as spinel phases. The cycle performance of the sample during extended cycling shows stable discharge capacities without any drastic capacity decay. The absence of capacity fading during cycling in the high voltage range of 2.0-4.8 V confirms that the prepared nanocomposite with multi-phase is structurally stable for lithium insertion/de-insertion process. (C) 2017 The Electrochemical Society. All rights reserved.</P>
Enhanced Electrochemical Properties of LiMnPO4/C by Glucose-Assisted Polyol Synthesis.
Song, Jinju,Gim, Jihyeon,Kim, Sungjin,Park, Wangeun,Jo, Jeonggeun,Kim, Jaekook American Scientific Publishers 2015 Journal of Nanoscience and Nanotechnology Vol.15 No.8
<P>Carbon-coated nano-sized LiMnPO4/C particles are synthesized by polyol method using low-cost glucose as the carbon source. The X-ray diffraction patterns of the synthesized samples are well indexed to the orthorhombic olivine-LiMnPO4 structure. The morphology studies using FE-SEM and HR-TEM images clearly illustrate thin layered carbon coatings on LiMnPO4 particles of sizes ranging between 50~100 nm. The LiMnPO4/C particles delivers an initial discharge capacity of 151 mA h g-1 at a current density of 1.6 mA g-1 in the voltage range of 2.5-4.3 V with impressive capacity retentions.</P>
Song, Jinju,Yang, Juhyun,Alfaruqi, Muhammad Hilmy,Park, Wangeun,Park, Sohyun,Kim, Sungjin,Jo, Jeonggeun,Kim, Jaekook The Korean Ceramic Society 2016 한국세라믹학회지 Vol.53 No.4
Carbon-coated sodium iron pyrophosphate ($Na_2FeP_2O_7$) was prepared by a simple and low-cost pyro-synthesis route for further use as the cathode for Na-ion batteries. The X-ray diffraction (XRD) pattern of the sample annealed at $650^{\circ}C$ confirmed the pure triclinic phase of $Na_2FeP_2O_7$. Electron microscopy studies revealed a cross linked plate shape morphology of the $Na_2FeP_2O_7$ sample. When tested for application in Na-ion battery, the $Na_2FeP_2O_7$ cathode showed two redox pairs in the potential window of 2.0-4.0 V. The cathode registered initial discharge and charge capacities of 80.85 and 90 mAh/g, respectively, with good cycling performance.
Song, Jinju,Gim, Jihyeon,Park, Sohyun,Kim, Jaekook Elsevier 2018 ELECTROCHIMICA ACTA Vol.261 No.-
<P><B>Abstract</B></P> <P>P2-structure sodium manganese oxide is synthesized by a facile reduction reaction. We provide new data on the direct use of sodium manganese oxide instead of lithium analogues as a low-cost electrode for lithium/sodium hybrid ion batteries after an ion-exchange process. Ion exchange occurs in sodium manganese oxide through the electrolyte during cell stabilization, as observed by X-ray diffraction analysis. The self ion-exchanged material delivers a high discharge capacity of 195 mA h g<SUP>−1</SUP> and a stable plateau at 3.0 V for 50 cycles with stable cyclability. In-situ X-ray diffraction and ex-situ X-ray absorption near edge structure studies also confirm reversible redox reactions and stable structural changes. The ex-situ inductively coupled plasma atomic emission spectroscopy analysis verifies that residual sodium ions in the structure act as pillars during cycling.</P>
A Sodium Manganese Oxide Cathode by Facile Reduction for Sodium Batteries
Song, Jinju,Gim, Jihyeon,Kim, Sungjin,Kang, Jungwon,Mathew, Vinod,Ahn, Docheon,Kim, Jaekook Wiley (John WileySons) 2014 Chemistry - An Asian Journal Vol.9 No.6
<P>A nonstoichiometric sodium manganese oxide (Na(x)MnO(2+δ)) cathode useful for sodium batteries was synthesized by an ambient-temperature strategy that involved facile reduction of aqueous sodium permanganate in sodium iodide and subsequent heat treatment at 600?C. Combined powder X-ray diffraction and synchrotron X-ray diffraction analyses confirmed the annealed sample to belong to a Na(x)MnO2 phase with a P2-hexagonal structure. The ICP-AES results confirmed the stoichiometry of the sample to be Na0.53MnO(2+δ) . Electron microscopy studies revealed the particle size of the electrode to be in the range of a few hundred nanometers. The Na0.53MnO(2+δ) cathode delivered an average discharge capacity of 170?mA?h?g(-1) with a stable plateau at 2.1?V for the initial 25?cycles versus sodium. Ex?situ XANES studies confirmed the reversible intercalation of sodium into Na0.53MnO(2+δ) and suggested the accommodation of over-stoichiometric Mn(4+) ions to contribute towards the performance of the electrode.</P>
산화물계 촉매 적용을 통한 Li-CO₂ 전지 성능개선 연구
송정환(Jeong-hwan Song),서준교(Joon Kyo Seo),마지영(Jiyoung Ma),우중제(Jung-je Woo),송진주(Jinju Song),장일찬(Il Chan Jang) 한국전지학회 2023 한국전지학회지 Vol.3 No.2
Li-CO₂ battery performance is closely related to the formation of reaction products. Li₂CO₃ forms crystals at about 5 nm and MnO₂ is known to have a strong anchoring force with a Li-containing carbonaceous species. In this study, the performance of Li-CO₂ battery was improved by applying a 10wt% mesoporous Beta-MnO₂ catalyst by a hard template method using mesopore silica.
남자간호대학생의 임상실습 적응과정에 관한 근거이론적 접근
송충숙(Song, Chung Sook),김진주(Kim, Jinju) 학습자중심교과교육학회 2017 학습자중심교과교육연구 Vol.17 No.23
본 연구는 임상실습 과정에서 남자간호대학생이 직면하는 경험을 탐색하여 적응하는 과정을 파악하고자 실시하였다. 연구 참여자는 간호학과에 재학 중이며, 임상 실습을 하고 있는 남자간호대학생 8명으로, 자료는 포화상태에 도달했을 때까지 수집하였고, 자료수집 기간은 2015년 10월 26일부터 12월 2일까지였으며, 자료 분석은 Strauss와 Corbin(2008)의 근거이론 분석방법에 따라 개방코딩, 축코딩, 선택코딩의 세 단계를 거치면서 계속적인 비교분석을 하였다. 본 연구 결과 18개의 범주, 45개의 하위범주, 77개 관련 개념들이 도출되었고, 핵심범주는 ‘미래의 간호사로서 삶 속에서 중심되기’로 나타났다. 결과적으로 남자간호대학생은 면담을 통해 자신의 생각을 성찰함으로써 임상실습을 통해 체계적이고 통합적으로 간호문제를 해결하는 능력을 지닌 미래의 간호사로서의 태도를 지니게 되었고, 이러한 긍정적인 경험으로 개개인에게 적합한 적응 방법을 모색하고 실행하고 있었다. This thesis seeks to develop a theory that explains the adaptation process of the male nursing students. With the topic ‘what is the adaptation process of the male nursing students?’, it conducted a study utilizing Grounded Theory suggested by Strauss & Corbin in 1998. The purpose of this study was to understand the coping experience of male nursing students in clinical practice. In-depth interview was done with semi-structured questionnaire on 8 male nursing students taking clinical practice. Data was analyzed through the grounded theory. Core category of coping experience of male nursing students was ‘finding the center of his life to be a future nurse’ while clinical practice. Male student’s coping strategies were ‘establishing identity’, ‘getting real feeling’, ‘ developing strength’, ‘achieving of goal’. Helping components for their coping behaviors were ‘support from field leader and practical professor’, ‘obstacle’. Through the coping experience during clinical practice, male nursing students confirmed their identities as student nurses. Male nursing students taking clinical practice tried to be a finding the center of his life to be a future nurse.