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윤연섭(Youn Saup Yoon),김병관(Byung Kuan Kim),안상용(Sang Yong An),김응진(Eung Jin Kim),이준호(Jun Ho Lee) 한국유화학회 2008 한국응용과학기술학회지 Vol.25 No.1
In the present study, impedance characteristics for AgO-Zn cell at various State-of-Charge (SoC) has been studied. The impedance measurements of AgO-Zn cell at various SoC were made over the frequency range from 100kHz to 10mHz with an amplitude 5mV. The impedance parameters have been evaluated by the analysis of the data using an equivalent circuit and a Non-linear least squares (NLLS) fitting method. The total resistances reflects the SoC of the cell. This indicates that the total resistance is important parameter for predicting SoC of AgO-Zn cell.
납축전지 전류집전체로서 그라파이트 시트의 전기화학적 안정성과 방전성능 평가
안상용,김응진,윤연섭,김희중,An, Sang-Yong,Kim, Eung-Jin,Yoon, Youn-Saup,Kim, Hee-Jung 한국전기화학회 2010 한국전기화학회지 Vol.13 No.2
Graphite sheet electro-deposited with lead was evaluated as a possible candidate for current collectors of lead acid batteries. Cyclic voltammetry was performed on the materials to evaluate the electrochemical properties. The graphite sheet electro-deposited with lead is electrochemically stable in the cathodic potential sweep. However, in the anodic potential sweep, the graphite sheet electro-deposited with lead is electrochemically unstable due to the oxygen evolution and the intercalation of sulfuric acid. Lead acid batteries were prepared by using a graphite sheet and a cast grid as current collectors for anode and performance test using those batteries was carried out. A lead acid battery with graphite sheets showed higher capacity and energy density than a conventional lead acid battery with cast grid. 납축전지 전류 집전체로서의 가능성을 보기위해 납 도금된 그라파이트 시트를 적용하여 평가하였다. 전기화학적 특성을 평가하기 위해 순환 전압전류법을 실시하였다. 납 도금된 그라파이트 시트는 납축전지의 음극으로 운용되는 전압범위에서 전기화학적으로 안정하였으나, 양극으로 운용되는 전압범위에서는 산소발생과 황산의 인터칼레이션으로 인해 전기화학적으로 불안정하였다. 납 도금된 그라파이트와 주조된 납 기판을 음극 전류집전체로 사용하여 전지를 제작하고, 방전 성능을 평가하였다. 납 도금된 그라파이트 시트를 적용한 납축전지가 금속 납 전류 집전체를 적용한 전지보다 더 높은 용량을 나타내었고, 에너지밀도 또한 더 높았다.
윤연섭,김병관,이수,김규태 한국공업화학회 1998 응용화학 Vol.2 No.2
VRLA(Valve regulated lead acid) batteries which were improved form typical flooded type, have been common in relative batteries industry. VRLA batteries are an enabling technology for a variety industries, particularly telecommunication, information technology, portable device, electric vehicle, a power generation system and etc. VRLA batteries have two type as AGM and gel. The gel type VRLA battery technology is not common in the interior of a country. On the technology of gel type VRLA batteries manufacture, we had a study about the characteristic of gel electrolyte and the effect of gel electrolyte when applied to the batteries as function of silica wt%. The gel electrolyte which is mixture of silica, water, diluted sulfuric acid and etc. The gravity of used diluted sulfuric acid is 1.265g/㎖ at 25℃ and silica is pyrogenic silica. Three kind of gel electrolyte were made and each of them contains 5wt%, 7wt% and 8wt% silica. The gravity, pH, viscosity and gelling time of the gel electrolyte were tested and applied to batteries. The batteries have been cycle-life test under the DOD100% with the C_5/5 at 25℃. The cycle-life tests of these batteries are going on.
윤연섭,김병관,이수,김규태,임남수 한국공업화학회 1998 응용화학 Vol.2 No.2
This paper presents the results of the development of VRLA(valve regulated lead acid) battery over 1000 cycles at D.O.D(depth of discharge) 50% suitable for photovoltaic power generation system. This battery was made of gel electrolyte and tubular positive plates. The cycle-life test was carried out for 1450 cycles at D.O.D 50% with 3H.R.(hour rate) and 1150 cycles at D.O,D 100% with 5 H.R. As we expected, we could get cycle-life over 1300 at D.O.D 100% in lab test. However, the positive active mass of a tubular-type gelled lead acid cell was changed morphologically to a great extent during the deep discharge-charge cycles. In order to reduce these changes, the effect of filling density on the active mass has been also studied. When suitable filling density is applied to a positive plate, filling density of the positive active mass was suppressed and the structural changes became smaller. The cycle-life of the positive plate increased remarkably by suitable filling density due to suppression of the decrease in cohesion and improvement of the electrochemical reaction between PbO₂ particles. The total water loss for gel battery was found to be depended on charging condition, space, and filling density.