http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
오상협,김명수,이흥락,Oh Sanghyub,Kim Myungsoo,Lee Heung Lark 한국전기화학회 2000 한국전기화학회지 Vol.3 No.2
겔형 VRLA전지의 파손방식을 조사하기 위하여 $100\%$ 방전심도에서 5시간율 전류로 충방전 수명시험을 하였다. 정전압 충전방식을 사용하여 충전전압을 2.40V와 2.50V로 하였을 때 1,000회 이상의 수명을 나타내었으며, 전지의 무게변화를 측정한 결과 각각 426.4g과 391.2g의 전해액이 감소하였다 2.50V로 충전한 전지가 우수한 수명특성을 나타내었으며, 전해액 손실량이 충전계수와 비례하는 것을 알 수 있었다 1,000회의 충방전 수명시험을 한 전지의 양극기판에는 약 $50{\mu}m$의 부식층이 관찰되었고, 활성물질의 미세구조는 크게 변하였다. 양극판의 파손방식은 활물질 탈락이며, 전해액 손실이 방전용량 감소의 원인인 것을 알 수 있었다. Cycle life test was carried out to evaluate the failure modes of the gel type nth batteries at $C_5$ currents and $100\%$ DOD. When the batteries were charged at constant voltage of 2.40 V and 2.50 Vi respectively, cycle lift was over 1,000 cycles. The batteries lost 426.4 g and 391.2 g of electrolyte far each case after the weight measurement. The battery charged at 2.50 V was shown to have a better cyclic performance than charged at 2.40 V, and the amounts of electrolyte loss was proportional to charge factor. After cycle test, the micro-structure of positive active material was completely changed and the corrosion layer of positive grid was about $50{\mu}m$. Failure mode of the positive plate of the gel type battery was a shedding of the positive active material, and the cause of discharge capacity decrease was found to be a electrolyte loss.
Comparison of the Sulfur Dioxide Primary Standard Gases of NPL and KRISS
오상협,김병문,문동민,김진석,O, Sang Hyeop,Kim, Byeong Mun,Mun, Dong Min,Kim, Jin Seok Korean Chemical Society 2001 Bulletin of the Korean Chemical Society Vol.22 No.12
Comparison of sulfur dioxide primary standard gases of the Korea Research Institute of Standards and Science (KRISS, Korea) and the National Physical Laboratory (NPL, UK) was performed. 100 ${\times}$10-6 mol/mol and 1,000 ${\times}$10-6 mol /mol primary standard gases (designated NPL S115 and S114, respectively) prepared gravimetrically and validated in NPL were used as transfer standards. Transfer standards were analyzed by NDIR sulfur dioxide analyzer and compared with KRISS PSM 112-03-624 and PSM 112-03-625 prepared gravimetrically. Adsorption corrected relative deviations of the primary standard gases were agreed to within 0.1%, and this agreement is within the expanded uncertainties (k = 2) of the primary standards at the two laboratories.
오상협,강홍렬,방부길,이진복 한국화학공학회 1996 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.34 No.1
고성능 니켈/금속수소화물 전지를 개발하기 위하여 압착식 (press type)과 도포식 (paste type)으로 제조한 금속수소화물 전극의 특성을 시험하였다. 양극으로는 CoO와 Zn(OH)₂를 첨가하여 제조한 고용량 도포식 Ni 전극을 사용하였다. 도포식 금속수소화물 전극을 PTFE로 표면처리하면 전극의 특성이 향상되어 고성능 니켈/금속수소화물 전지의 전극으로 사용할 수 있었다. 4/5A형(φ16.5 ㎜×42.3 ㎜) 니켈/금속수소화물 전지의 방전용량은 1400 mAh 이상이었으며 100% 방전심도에서 500회 이상의 전지 수명을 나타내었다. 전지를 해체하여 분석한 결과 파손원인은 전해액의 불균일한 분포로 인한 부분적인 전해액의 고갈인 것으로 추정된다. Characteristics of metal hydride(MH) electrodes fabricated by pressing and pasting method were examined in the process of developing high performance Ni/MH battery. High capacity paste-type Ni electrode with CoO and Zn(OH)₂ was used as positive electrode. MH electrode with Ni foam grid which was surface treated by PTFE, showed superior performance and it could be used in high performance Ni/MH battery. 4/5A type(φ16.5 ㎜×42.3 ㎜) Ni/MH battery has showed a discharge capacity over 1400 mAh and cycle life over 500 cycles at 100% DOD(depth of discharge). Based on the observation through post-mortem of the failed cells, failure mode in this case was assumed to be local dry out of electrolyte caused by uneven electrolyte distribution as cycle proceeds in the Ni/MH system.