Experimental analysis on the degradation behavior of overdischarged lithium-ion battery combined with the effect of high-temperature environment |
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| Authors: | Dongxu Ouyang Jingwen Weng Mingyi Chen Jiahao Liu Jian Wang |
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| Affiliation: | 1. State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei, 230026 China;2. School of Environment and Safety Engineering, Jiangsu University, Zhenjiang, 212013 China;3. College of Ocean Science and Engineering, Shanghai Maritime University, Shanghai, 201306 China |
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| Abstract: | A set of experiments are performed in the present work to investigate the degradation behavior of lithium-ion battery during overdischarge cycling, as well as the influence of a high-temperature environment on the degradation. Among, different discharge cut-off voltages (1.0, 0.5, and 0.2 V) are included. During the overdischarge process, batteries experience a stage where a violent electro-thermal behavior is exhibited, involving sharp decreases in the voltage and current, and a fierce increase in the surface temperature; moreover, several parameters such as the discharge capacity, energy density, and internal resistances are all increased after overdischarge. Besides, a poor rate capacity and serious capacity degradation can also be seen during the overdischarge cycling, which is further reflected by the evolution of battery surface temperature, charge/discharge voltage, and internal resistances. What is more, it is found that battery electro-thermal parameters, eg, temperature rise, degradation rate, and internal resistances, increase exponentially as overdischarge deepens. Finally, a high-temperature environment is verified to deteriorate the degradation of overdischarged battery. |
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| Keywords: | degradation high temperature lithium-ion battery overdischarge |
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