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http://dx.doi.org/10.18770/KEPCO.2020.06.02.173

Effect of Fast Charging Mode on the Degradation of Lithium-Ion Battery: Constant Current vs. Constant Power  

Park, Sun Ho (Department of Energy Science and Engineering, Daegu Gyeongbuk Institute of Science and Technology (DGIST))
Oh, Euntaek (Department of Energy Science and Engineering, Daegu Gyeongbuk Institute of Science and Technology (DGIST))
Park, Siyoung (Department of Energy Science and Engineering, Daegu Gyeongbuk Institute of Science and Technology (DGIST))
Lim, Jihun (KEPCO Research Institute, Korea Electric Power Corporation)
Choi, Jin Hyeok (KEPCO Research Institute, Korea Electric Power Corporation)
Lee, Yong Min (Department of Energy Science and Engineering, Daegu Gyeongbuk Institute of Science and Technology (DGIST))
Publication Information
KEPCO Journal on Electric Power and Energy / v.6, no.2, 2020 , pp. 173-179 More about this Journal
Abstract
Electric vehicles (EVs) using lithium secondary batteries (LIBs) with excellent power and long-term cycle performance are gaining interest as the successors of internal combustion engine (ICE) vehicles. However, there are few systematic researches for fast charging to satisfy customers' needs. In this study, we compare the degradation of LIB where its composition is LiNi0.5Co0.2Mn0.3/Graphite with the constant current and constant power-charging method. The charging speed was set to 1C, 2C, 3C and 4C in the constant current mode and the value of constant power was calculated based on the energy at each charging speed. Therefore, by analyzing the battery degradation based on the same charging energy but different charging method; CP charging method can slow down the battery degradation at a high rate of 3C through the voltage curve, capacity retention and DC-IR. However, when the charging rate was increased by 4C or more, the deviation between the LIBs dominated the degradation than the charging method.
Keywords
Fast Charging; Constant Current; Constant Power; Degradation; Lithium Ion Battery;
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