Degradation predictionsoflithium iron phosphate battery

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

研究成果: Conference contribution

1 被引用数 (Scopus)

抄録

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.

本文言語English
ホスト出版物のタイトル28th International Electric Vehicle Symposium and Exhibition 2015, EVS 2015
出版社Korean Society of Automotive Engineers
ISBN(印刷版)9781510809260
出版ステータスPublished - 2015
イベント28th International Electric Vehicle Exhibition, EVS 2015 - Goyang, Korea, Republic of
継続期間: 2015 5 32015 5 6

Other

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

ASJC Scopus subject areas

  • Fuel Technology
  • Automotive Engineering
  • Electrical and Electronic Engineering

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