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강길구,박승갑,강세선,권호영,Kang, Kil-Ku,Park, Sung-Gap,Kang, Sei-Sun,Kwon, Ho-Young 한국재료학회 2002 한국재료학회지 Vol.12 No.8
In order to improve the hydrogen storage capacity and the activation properties of the hydrogen storage alloys, the rare-earth metal alloy series, MmN $i_{4.5}$M $n_{0.5}$Z $r_{x}$(x=0, 0.025, 0.05, 0.1), are prepared by adding excess Zr in MmN $i_{4.5}$M $n_{0.5}$ alloy. The various parts in hydrogen storage vessel consisted of copper pipes reached the setting temperature within 4~5 minutes after heat addition, which indicated that storage vessel had a good heat conductivity required in application. The performance test on storage vessel filled with rare-earth metal alloys of 1000 gr was also conducted after hydrogen charging for 10 min at $18^{\circ}C$ under 10 atm. It showed that the average capacity of discharged hydrogen volume was found to be for $MmNi_{4.5}$ $Mn_{0.5}$ and $MmNi_{4.5}$ $Mn_{x}$ 0.5/$Zr_{samples}$ indicated that the released amount of hydrogen for this $AB_{5}$ type alloys was more than 92 % of theoretic value, and also it was found that the optimum discharging temperature for obtaining an appropriate pressure of 3 atm was determined to be $V^{\circ}C$ for $MmNi_{4.5}$ $Mn_{0.5}$$Zr_{x}$(x=0, 0.025, 0.05, 0.1) hydrogen storage alloys. The released amount of these hydrogen storage samples was 125 $\ell$ , 122.4 $\ell$ and 108.15 $\ell$/kg for $MmNi_{4.5}$ $Mn_{0.5}$ $Zr_{0.025}$ $MmNi_{4.5}$M $n_{0.5}$Z $r_{0.05}$, and MmN $i_{4.5}$ Mn_0.5$Zr_{0}$, at $70^{\circ}C$ respectively. Amount of the 2nd phases increase with increase on Zr contents in $MmNi_{4.5}$$Mn_{0.5}$ $Zr_{ 0.1}$/ alloy. This phenomenon indicates that$ ZrNi_3$ in $MmNi_{4.5}$ $Mn_{0.5}$ $Zr_{x}$ / phase, which shows the maximum storage capacity and the strong resistance to intrinsic degradation, is considered as a proper alloy for hydrogen storage. As the Zr contents increase, the activation time and the plateau pressure decreases and sloping of the plateau pressure increases.creases.eases.s.
과잉의 Zr을 첨가한 MmNi<sub>4.5</sub>Mn<sub>0.5</sub>Zr<sub>x</sub>(x=0, 0.025, 0.05, 0.1) 합금의 수소화특성에 관한 연구
강길구,박승갑,강세선,권호영,Kang, Kil-Ku,Park, Sung-Gap,Kang, Sei-Sun,Kwon, Ho-Young 한국재료학회 2002 한국재료학회지 Vol.12 No.8
In order to improve the hydrogen storage capacity and the activation properties of the hydrogen storage alloys, the rare-earth metal alloy series, $MmNi_{ 4.5}$$Mn_{0.5}$ $Zr_{x}$ (x=0, 0.025, 0.05, 0.1), are prepared by adding the excess Zr in $MmNi_{4.5}$ $Mn_{0.5}$ / alloy for the strong resistance to intrinsic degradation. The hydrogen storage alloys of rare-earth metal such as $LaNi_{5}$ , and $MmNi_{5}$X and $MmNi_{4.5}$ /$_Mn{0.5}$ alloys which substituted La by misch metal properties were characterized as well. The hydrogen storage alloys were produced by melting each metal mixture in arc melting furnace, and the as-cast alloys were heat-treated at $1100^{\circ}C$ for 10 hr. The major elements of misch metal(Mm) were La, Ce, Pr and Nd with some impurities less than 1wt.% determined by ICP-AES. X-ray diffraction indicated that the structure for these samples was a single phase of hexagonal with $CaCu^{5}$ type. As the Zr contents increases, the activation time and the plateau pressure decrease and sloping of the plateau pressure increase. Amount of the 2nd phases increases with increase in Zr contents in $MmNi_{ 4.5}$$Mn_{0.5}$ $Zr_{0.1}$ alloy, This phenomenon indicated that $ZrNi_3$ in this phase, which shows the maximum storage capacity and the strong resistance to intrinsic degradation, is considered as a proper alloy for hydrogen storage..
RESEARCH INSTITUTE OF INDUSTRIAL TECHNOLOGY CHUNGNAM NATIONAL UNIVERSITY
강길구,조동래 忠南大學校 産業技術硏究所 1997 산업기술연구논문집 Vol.12 No.2
The Reduction-Diffusion(R/D process) is an economical way of producing functional materials which contain rare-earth elements and has been applied to the production of hydrogen alloy. However, the process has not been applied to the production of materials having various alloying elements of strictly controlled composition, because compositions of R/D process products are controlled by diffusion in solid phase. We used Ca as reducer to produce TiFe used as a hydrogen alloy from Fe and TiO₂by Reduction-Diffusion process. Ca was found to be effective both for reduction and diffusion process. Moreover, Ca Oxide was easily removed in an NH₄Cl solution after the reaction.
고등학생의 신체활동량에 따른 에너지소비량과 에너지섭취에 관한 연구
이주형 ( Joo Hyung Lee ),강길구 ( Gil Goo Kang ) 국민대학교 스포츠과학연구소 2008 스포츠科學硏究所論叢 Vol.26 No.-
The purpose of this study was to investigate whether physical activity level can influence energy expenditure and energy intake among high school students. Total 109 male students completed International Physical Activity Questionnaire(IPAQ) and food record to analyze daily energy intake by CAN Pro 2.0. Subjects were divided into three groups by physical activity levels. As a result, there were significant differences in energy expenditure and energy intake among groups. However, there was no interaction between daily energy intake requirements and energy expenditure and daily energy intake.
Improved Cycling Ability of Silicon-Graphite Composite Anode Materials through the SEI Control
김재람,조현탁,( Nguyen Dan Thien ),강길구,전도만,양아름,송승완 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1
Silicon-graphite composites has been considered as promising anode materials for higher energy density Li-ion batteries because of larger theoretical specific capacity of silicon than currently commercialized graphite. They, however, suffer from a large volume change during lithiation and delithiation, resulting in the particle cracking, an instability of the solid electrolyte interphase (SEI) and finally leading to poor cycle life. In order to solve the problems, several strategies in the aspects of improved electrical conductivity and buffering effect of volume change have been developed, which are the fabrication of silicon composites with carbon materials and the use of functional binder and electrolyte additives. Here, we focus on the control of electrode-electrolyte interfacial reaction and the formation of a stable SEI layer using various additives. The influence of SEI stability on cycling performance of silicon-graphite composite anodes would be discussed in the meeting.