Degradation predictionsoflithium iron phosphate battery

Hung Chen Chien, Yuya Hato, Toshio Hirota, Yushi Kamiya, Yasuhiro Daisho, Shoichi Inami

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

1 Citation (Scopus)

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.

Original languageEnglish
Title of host publication28th International Electric Vehicle Symposium and Exhibition 2015, EVS 2015
PublisherKorean Society of Automotive Engineers
ISBN (Print)9781510809260
Publication statusPublished - 2015
Event28th International Electric Vehicle Exhibition, EVS 2015 - Goyang, Korea, Republic of
Duration: 2015 May 32015 May 6

Other

Other28th International Electric Vehicle Exhibition, EVS 2015
CountryKorea, Republic of
CityGoyang
Period15/5/315/5/6

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Keywords

  • Bev (battery electric vehicle)
  • Degradation prediction
  • Durability
  • Lithium iron phosphate battery
  • Lithium-ion battery

ASJC Scopus subject areas

  • Fuel Technology
  • Automotive Engineering
  • Electrical and Electronic Engineering

Cite this

Chien, H. C., Hato, Y., Hirota, T., Kamiya, Y., Daisho, Y., & Inami, S. (2015). Degradation predictionsoflithium iron phosphate battery. In 28th International Electric Vehicle Symposium and Exhibition 2015, EVS 2015 Korean Society of Automotive Engineers.