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Article

Degradation Predictions of Lithium Iron Phosphate Battery

by
Yuya Hato
1,*,
Chien Hung Chen
1,
Toshio Hirota
1,
Yushi Kamiya
1,
Yasuhiro Daisho
1 and
Shoichi Inami
2
1
Waseda University, 55S-704, 3-4-1 Okubo, Shinjuku-ku, Tokyo, Japan
2
MITSUI ENGINEERING & SHIPBUILDING CO.LTD, 5-6-4 Tsukiji, Chuo-ku, Tokyo, Japan
*
Author to whom correspondence should be addressed.
World Electr. Veh. J. 2015, 7(1), 25-31; https://doi.org/10.3390/wevj7010025
Published: 27 March 2015

Abstract

Degradation mechanisms of lithium iron phosphate battery have been analyzed with calendar tests and cycle tests. To quantify capacity loss with the life prediction equation, it is seen from the aspect of separating the total capacity loss into calendar capacity and real cycle capacity loss. The real cycle capacity loss of total capacity loss was derived by subtracting the calendar capacity loss parts during cycle tests. It is considered that calendar capacity loss is dominated by SEI formation. On the other hand, real cycle capacity loss includes structure disorder of electrodes and promotion of SEI growth such as delamination and regrowth. Generally, the test results indicated that capacity loss increases under high temperature and SOC condition, and SOC range (ΔSOC) is not related to the loss. However, we founded that the test results under 5℃ condition do not exactly show the same tendency of degradation. As a result, the life prediction equation is based on the chemical kinetics and it can only be adopted only beyond the 15℃ temperature limitation. At this time in life prediction equation, to take ΔSOC into consideration and describe the real cycle capacity loss specifically with amounts of lithium-ion intercalation/deintercalation, the processing amount of current is adopted as the standard of capacity degradation instead of the cycle number. Finally, it is considered to be possible that certain reactions such as further structure disorder or lithium plating caused under low temperature. However, we also founded that DC internal resistance tests results indicated that only calendar capacity loss can apply to chemical kinetics. It is necessary to consider the other construction method of the life prediction equation in the future
Keywords: lithium-ion battery; durability; degradation prediction; lithium iron phosphate battery; BEV (Battery Electric Vehicle) lithium-ion battery; durability; degradation prediction; lithium iron phosphate battery; BEV (Battery Electric Vehicle)

Share and Cite

MDPI and ACS Style

Hato, Y.; Chen, C.H.; Hirota, T.; Kamiya, Y.; Daisho, Y.; Inami, S. Degradation Predictions of Lithium Iron Phosphate Battery. World Electr. Veh. J. 2015, 7, 25-31. https://doi.org/10.3390/wevj7010025

AMA Style

Hato Y, Chen CH, Hirota T, Kamiya Y, Daisho Y, Inami S. Degradation Predictions of Lithium Iron Phosphate Battery. World Electric Vehicle Journal. 2015; 7(1):25-31. https://doi.org/10.3390/wevj7010025

Chicago/Turabian Style

Hato, Yuya, Chien Hung Chen, Toshio Hirota, Yushi Kamiya, Yasuhiro Daisho, and Shoichi Inami. 2015. "Degradation Predictions of Lithium Iron Phosphate Battery" World Electric Vehicle Journal 7, no. 1: 25-31. https://doi.org/10.3390/wevj7010025

APA Style

Hato, Y., Chen, C. H., Hirota, T., Kamiya, Y., Daisho, Y., & Inami, S. (2015). Degradation Predictions of Lithium Iron Phosphate Battery. World Electric Vehicle Journal, 7(1), 25-31. https://doi.org/10.3390/wevj7010025

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