Effect of long-term overcharge and operated temperature on performance of rechargeable NiMH cells |
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| Affiliation: | 1. Revolt Technology AS, Innherredsveien 7, 7014 Trondheim, Norway;2. Tianjin Peace Bay Power Sources Group Co. Ltd., Tianjin 300384, China;3. Institute of New Energy Material Chemistry, Department of Materials Chemistry, Nankai University, Tianjin 300071, China;4. Department of Structural Chemistry, Arrhenius Laboratory, Stockholm University, S-106 91 Stockholm, Sweden;1. Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), College of Chemistry, Nankai University, Tianjin 300071, China;2. School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin 300130, China;1. Department of Physics, Changchun Normal University, Changchun 130032, China;2. Faculty of Science, Mudanjiang Normal University, Mudanjiang 157012, China;3. Key Laboratory of Luminescence and Application, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Science, Changchun 130033, China;1. Department of Applied Chemistry, Konkuk University, Chungju Campus, 322 Danwol-dong, Chungju-shi, Chungbuk-do 380-701, South Korea;2. Department of Chemistry, Center for Nanotechnology at CYCU, Chung-Yuan Christian University, 200 Chung-Pei Road, Chung Li 320, Taiwan, ROC |
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| Abstract: | In this article, sub-C size cylindrical NiMH cells were constructed for the performance investigation under long-term overcharge and elevated temperatures. The influence of operated conditions on cell performance and electrode materials was examined. The experimental results revealed that the NiMH cells had good tolerance for 1-month overcharge at a 0.2C rate, remaining the capacity and capacity-rate performance and showing promise as a candidate for backup power sources. However, the sub-C size NiMH cells did not exhibit good performance at elevated temperatures, and the cycling stability with 100% DOD (depth of discharge) at temperature of >50 °C is necessary to be further improved. The deterioration of electrochemical capacity and cycling stability at elevated temperatures was analyzed and the reasons were discussed. |
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