Estimating activation energy of the LiFePO4 battery using dual dynamic stress accelerated degradation tests

Yu Chang Lin, Yi Ru Li, Kuan Jung Chung

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

This study mainly focused on evaluating the activation energy of LiFePO4 batteries by using a novel dual dynamic stress accelerated degradation test, called D2SADT. This test method was developed to simulate a situation involving driving an electric vehicle in the city. D2SADT contains two controllable dynamic stress variables: the environmental factor corresponding to temperature cycling and the power factor corresponding to charging-discharging currents and times at which they were implemented simultaneously. A reference power test was performed repeatedly at a certain time (e.g., five temperature cycles), and the cell capacity was then calculated to monitor the degradation of the batteries. A physical-based reliability model called Norris-landzberg equation was applied to compute the activation energy which is the indicator to explain the degradation behavior of the Li-ion battery using D2SADT. The test results indicate that the activation energy decreases when the capacity loss (before 10%) increases. It is concluded that the power fade may be accelerated when the charge-discharge cycle increases for the LiFePO4 battery operated a specific power-and-temperature cycling condition. The test is ongoing and the updated results are under analysis to help us understand the degradation mechanism of Li-ion batteries by more realistic test conditions.

Original languageEnglish
Title of host publicationConference Proceedings - 23rd ISSAT International Conference on Reliability and Quality in Design
EditorsHoang Pham
PublisherInternational Society of Science and Applied Technologies
Pages121-125
Number of pages5
ISBN (Electronic)9780991057641
Publication statusPublished - 2017 Jan 1
Event23rd ISSAT International Conference on Reliability and Quality in Design 2017 - Chicago, United States
Duration: 2017 Aug 32017 Aug 5

Publication series

NameConference Proceedings - 23rd ISSAT International Conference on Reliability and Quality in Design

Other

Other23rd ISSAT International Conference on Reliability and Quality in Design 2017
CountryUnited States
CityChicago
Period17-08-0317-08-05

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All Science Journal Classification (ASJC) codes

  • Safety, Risk, Reliability and Quality

Cite this

Lin, Y. C., Li, Y. R., & Chung, K. J. (2017). Estimating activation energy of the LiFePO4 battery using dual dynamic stress accelerated degradation tests. In H. Pham (Ed.), Conference Proceedings - 23rd ISSAT International Conference on Reliability and Quality in Design (pp. 121-125). (Conference Proceedings - 23rd ISSAT International Conference on Reliability and Quality in Design). International Society of Science and Applied Technologies.