| Empirical Capacity Degradation Model for a Lithium-Ion Battery Based on Various C-Rate Charging Conditions |
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Dong Hyun Kim1,2, Juhyung Lee3, Kyungseop Shin4, Kwang-Bum Kim2, Kyung Yoon Chung1 |
1Energy Storage Research Center, Korea Institute of Science and Technology (KIST), 5, Hwarang-ro 14-gil, Seongbuk-gu, Seoul 02792, Republic of Korea
2Department of Materials Science and Engineering, Yonsei University, 134 Shinchon-dong, Seodaemoon-gu, Seoul 03722, Republic of Korea
3Technology Development Group Product & Solution Research Center, LS Cable & System Ltd., 228, Suchul-daero, Gumi-si, Gyeongbuk 39369, Republic of Korea
4Department of Computer Science, Sangmyung University, Hongjimun 2-gil 20, Jongno-gu, Seoul, 03016, Republic of Korea |
Correspondence:
Kyungseop Shin,
Email: ksshin@smu.ac.kr
Kwang-Bum Kim,
Email: kbkim@yonsei.ac.kr
Kyung Yoon Chung,
Email: kychung@kist.re.kr
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Received: 19 February 2024 • Accepted: 9 April 2024 |
| Abstract |
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Lithium-ion batteries are widely used in many applications due to their high energy density, high efficiency, and excellent cycle ability. Once an unknown Li-ion battery is reusable, it is important to measure its lifetime and state of health. The most favorable measurement method is the cycle test, which is accurate but time- and capacity-consuming. In this study, instead of a cycle test, we present an empirical model based on the C-rate test to understand the state of health of the battery in a short time. As a result, we show that the partially accelerated charge/discharge condition of the Li-ion battery is highly effective for the degradation of battery capacity, even when half of the charge/discharge conditions are the same. This observation provides a measurable method for predicting battery reuse and future capacity degradation. |
| Key Words:
capacity degradation model, Lithium ion battery, C-rate, charging condition, emperical |
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