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공명철,구할본,Kong, Ming Zhe,Nguyen, Van Hiep,Gu, Hal-Bon 한국전기전자재료학회 2016 전기전자재료학회논문지 Vol.29 No.5
In this work, $LiMn_2O_4$ and $LiNi_{1/3}Mn_{1/3}Co_{1/3}O_2$ cathode materials are mixed by some specific ratios to enhance the practical capacity, energy density and cycle performance of battery. At present, the most used cathode material in lithium ion batteries for EVs is spinel structure-type $LiMn_2O_4$. $LiMn_2O_4$ has advantages of high average voltage, excellent safety, environmental friendliness, and low cost. However, due to the low rechargeable capacity (120 mAh/g), it can not meet the requirement of high energy density for the EVs, resulting in limiting its development. The battery of $LiMn_2O_4-LiNi_{1/3}Mn_{1/3}Co_{1/3}O_2$ (50:50 wt%) mixed cathode delivers a energy density of 483.5 mWh/g at a current rate of 1.0 C. The accumulated capacity from $1^{st}$ to 150th cycles was 18.1 Ah/g when the battery is cycled at a current rate of 1.0 C in voltage range of 3.2~4.3 V.
리튬폴리머전지용 정극활물질 LiFePO<sub>4</sub>의 전기화학적 특성
공명철,김현수,구할본,Kong Ming-Zhe,Kim Hyun-Soo,Gu Hal-Bon 한국전기전자재료학회 2006 전기전자재료학회논문지 Vol.19 No.6
$LiFePO_4$ has been received attention as a potential cathode material for the lithium secondary batteries. In our study, $LiFePO_4$ cathode active materials were synthesized by a solid-state reaction. It was modified by coating $TiO_2$ and carbon in order to enhance cyclic performance and electronic conductivity. $TiO_2$ and carbon coatings on $LiFePO_4$ materials enhanced the electronic conductivity and its charge/discharge capacity. For lithium polymer battery applications, $LiFePO_4$/solid polymer electrolyte (SPE)/Li and $LiFePO_{4}-TiO_{2}/SPE/Li$ cells were characterized by a cyclic voltammetry and charge/discharge cycling. The electrode with $LiFePO_{4}-carbon-TiO_{2}$ in PVDF-PC-EC-$LiClO_{4}$ electrolyte showed promising capacity of above 100 mAh/g at 1C rate.
리튬이온전지용 정극활물질 LiNi<sub>0.4</sub>Mn<sub>0.3</sub>Co<sub>0.3</sub>O<sub>2</sub>의 전기화학적 특성
공명철,김현수,김기택,구할본,Kong, Ming-Zhe,Kim, Hyun-Soo,Kim, Ke-Tack,Gu, Hal-Bon 한국전기전자재료학회 2006 전기전자재료학회논문지 Vol.19 No.7
[ $LiNi_{0.4}Mn_{0.3}Co_{0.3}O_2$ ] cathode material was synthesized by a mixed hydroxide method. Structural characterization was carried out using X-ray diffraction studies. Electrochemical studies were performed by assembling 2032 coin cells with lithium metal as an anode. DSC (Differential scanning calorimetry) data showed that exothermic reactions of $LiNi_{0.4}Mn_{0.3}Co_{0.3}O_2$ charged to 4.3 V versus Li started at high temperatures$(280\sim390^{\circ}C)$. The cell of $LiNi_{0.4}Mn_{0.3}Co_{0.3}O_2$ mixed cathode delivered a discharge capacity of 150 mAh/g at a 0.2 C rate. The capacity of the cell decreased with the current rate and a useful capacity of 134 mAh/g was obtained at a 2 C rate. The reversible capacity after 100th cycles was 126 mAh/g when a cell was cycled at a current rate of 0.5 C in $2.8\sim4.3V$.
국방표준화 사업의 연구과제 선정평가 모델에 관한 사례 연구
박일광,공명복,김준원,황우열,성인철 한국경영공학회 2010 한국경영공학회지 Vol.15 No.2
The purpose of this study is to propose an evaluation model for the selection of Commercial and Military Collaboration Standardization(CMCS)'s projects in the expanded project scope. The new evaluation model was developed by the AHP method. It's suitability was assessed through AERA, APA, NCME(1999)'s five validity types, Cronbach's estimation, and percentage of gage R&R. The result was shown that the model had high measurement validity and internal consistency, but the precision not sufficient to meet the criteria of Burdick et. al.,(2003) and Automobile Industry Action Group(AIAG). These criteria are very strict to apply to the new model. If the model is comprehensively assessed, it is suitable as an evaluation model for project selection. It is expected that the new model contribute to the selection of national R&D projects on the standardization.
리튬이차전지 양극활물질용 LiMn2O4-LiNi1/3Mn1/3Co1/3O2의 전기화학적 특성
구할본,공명철,Van Hiep Nguyen 한국전기전자재료학회 2016 전기전자재료학회논문지 Vol.29 No.5
In this work, LiMn2O4 and LiNi1/3Mn1/3Co1/3O2 cathode materials are mixed by some specific ratios to enhance the practical capacity, energy density and cycle performance of battery. At present, the most used cathode material in lithium ion batteries for EVs is spinel structure-type LiMn2O4. LiMn2O4 has advantages of high average voltage, excellent safety, environmental friendliness, and low cost. However, due to the low rechargeable capacity (120 mAh/g), it can not meet the requirement of high energy density for the EVs, resulting in limiting its development. The battery of LiMn2O4-LiNi1/3Mn1/3Co1/3O2 (50:50 wt%) mixed cathode delivers a energy density of 483.5 mWh/g at a current rate of 1.0 C. The accumulated capacity from 1st to 150th cycles was 18.1 Ah/g when the battery is cycled at a current rate of 1.0 C in voltage range of 3.2~4.3 V. 본 연구에서는 양극활물질 LiMn2O4의 에너지 밀도를 높이고자 일정한 비율별로 가역용량이 높은 양극활물질 LiNi1/3Mn1/3Co1/3O2을 단순 추가 혼합하는 방식으로 양극활물질 LiMn2O4-LiNi1/3Mn1/3Co1/3O2를 제조하여 전기화학적 특성을 평가 분석하였다. 양극활물질 LiNi1/3Mn1/3Co1/3O2를 50 wt% 혼합하였을 때 혼합비율 대비 용량증가폭이 가장 높았고, 평균전압 감소폭이 가장 낮았기에 에너지밀도는 483.5 mWh/g으로 높았다. 또한, 150회 충·방전이 진행되는 동안 가역용량이 높은 양극활물질 LiNi1/3Mn1/3Co1/3O2의 혼합으로 하여 누적 방전용량은 양극활물질 LiMn2O4로 제작한 코인셀에 비하여 모두 증가하였으며, 양극활물질 LiNi1/3Mn1/3Co1/3O2를 50 wt% 혼합하여 제작한 코인셀이 18.1 Ah/g으로 가장 높게 나타내었다.
민·군 협력에 의한 중·장기 국방 표준화 로드맵 개발에 관한 연구
박일광,공명복,성인철 대한산업공학회 2009 산업공학 Vol.22 No.3
The purpose of this study is to develop a mid and long-term roadmap for "Commercial and Military Collaboration Standardization(CMCS) program." We developed three layer’s roadmap through systematical process. The roadmap is composed of four targets, eight projects and forty-six tasks. To evaluate the quality of the roadmap, we applied checklist method and statistical analysis. Consequently, the quality is positive and it shows that the roadmap could apply for CMCS program. In addition, it is expected to contribute to the standardization between military supplies and commercial products.