| 학회 |
한국재료학회 |
| 학술대회 |
2007년 가을 (11/02 ~ 11/02, 성균관대학교) |
| 권호 |
13권 2호 |
| 발표분야 |
에너지환경재료 |
| 제목 |
Study on cell impedance of rechargeable lithium batteries for hybrid electric vehicle |
| 초록 |
Electrochemical energy conversion devices with high power density have received much interest for the application of transportation systems due to their environmental friendliness. The performance of high power battery is mainly up to how we can significantly reduce the polarization or how we can increase the maximum discharging rate. Here, we propose the viable way to analyze dc polarization of lithium-ion battery on the basis of semi-empirical approach to its internal electric elements. Typical potential transients showed that the polarization of the aged cell was much larger than that of the fresh cell. In particular, the aged cell reached lower cut-off voltage in the course of continuous discharging process before the specific discharging time predetermined while the fresh cell was continuously discharged under the same operating conditions. In order to further investigate the dc polarization of both aged and fresh cell, the elementary resistances and capacitances were carefully estimated from the least square fitting of the experimental impedance spectra. Then, the effect of individual electric elements on total cell impedance was considered as a function of discharging time. In this presentation, the fractional contribution of the internal electric elements to total dc polarization will be given. Furthermore, the practical way to design effectively the high power lithium-ion battery will be discussed. |
| 저자 |
Dae-Keun Kang1, Heon-Cheol Shin2
|
| 소속 |
1School of Materials Science and Engineering, 2Pusan National Univ. |
| 키워드 |
High-power lithium-ion battery; cell design; cell impedance
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| E-Mail |
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