Journal of Electrochemical Science and Technology

  • 제13권2호
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  • Pages.208-212
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  • 2022
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  • 2093-8551(pISSN)
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  • 2288-9221(eISSN)
한국전기화학회 (The Korean Electrochemical Society)
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Effect of Temperature on the Deterioration of Graphite-Based Negative Electrodes during the Prolonged Cycling of Li-ion Batteries

  • Yang, Jin Hyeok (Department of Energy Engineering, Konkuk University) ;
  • Hwang, Seong Ju (Graduate School of Energy & Environment, Seoul National University of Science & Technology) ;
  • Chun, Seung Kyu (Graduate School of Energy & Environment, Seoul National University of Science & Technology) ;
  • Kim, Ki Jae (Department of Energy Engineering, Konkuk University)
  • 투고 : 2021.09.13
  • 심사 : 2021.10.19
  • 발행 : 2022.05.28
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초록

In this paper, we report the effects of temperature on the deterioration of graphite-based negative electrodes during the longterm cycling of lithium-ion batteries (LIBs). After cycling 75 Ah pouch-type LIB full cells at temperatures of 45℃ (45-Cell) and 25℃ (25-Cell) until their end of life, we expected to observe changes in the negative electrode according to the temperature. The thickness of the negative electrode of the cell was greater after cycling; that of the electrode of 45-Cell (144 ㎛) was greater than that of the electrode of 25-Cell (109 ㎛). Cross-sectional scanning electron microscopy analysis confirmed that by-products caused this increase in the thickness of the negative electrode. The by-products that formed on the surface of the negative electrode during cycling increased the surface resistance and decreased the electrical conductivity. Voltage profiles showed that the negative electrode of 25-Cell exhibited an 84.7% retention of the initial capacity, whereas that of 45-Cell showed only a 70.3% retention. The results of this study are expected to be relevant to future analyses of the deterioration characteristics of the negative electrode and battery deterioration mechanisms, and are also expected to provide basic data for advanced battery design.

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과제정보

Jin Hyeok Yang and Seong Ju Hwang contributed equally to this work. This work was supported by the Technology Innovation Program (20011379) funded by the Ministry of Trade, Industry & Energy (MOTIE, Korea).

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