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Search / Korean Journal of Chemical Engineering
HWAHAK KONGHAK,
Vol.34, No.1, 50-57, 1996
고성능 니켈/금속수소화물 전지의 음극 제조 방법 연구
Study on Negative Electrode Manufacturing Method for High Performance Ni/Metal Hydride Batteries
오상협, 이진복, 방부길, 강홍렬
고성능 니켈/금속수소화물 전지를 개발하기 위하여 압착선(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(Φ16.5mm×42.3mm) 니켈/금속수소화물 전지의 방전용량은 1400mAh 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 exam-ined 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(Φ16.5mm×42.3mm)Ni/MH battery has showed a discharge capacity over 1400mAh 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.
Keywords: Nickel-Metal Hydride Battery; Metal Hydride Electrode; Hydrogen Absorbing Alloy; Negative Electrode
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