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Degradation Predictions of Lithium Iron Phosphate Battery
- Source :
- World Electric Vehicle Journal, Volume 7, Issue 1, Pages 25-31
- Publication Year :
- 2015
- Publisher :
- Multidisciplinary Digital Publishing Institute, 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
- Subjects :
- Battery (electricity)
Materials science
Lithium vanadium phosphate battery
BEV (Battery Electric Vehicle)
Lithium iron phosphate
chemistry.chemical_element
Thermodynamics
lithium-ion battery
Internal resistance
Lithium-ion battery
chemistry.chemical_compound
chemistry
Automotive Engineering
degradation prediction
lithium iron phosphate battery
Degradation (geology)
durability
Lithium
Capacity loss
Nuclear chemistry
Subjects
Details
- Language :
- English
- ISSN :
- 20326653
- Database :
- OpenAIRE
- Journal :
- World Electric Vehicle Journal
- Accession number :
- edsair.doi.dedup.....7c478472b6cc3ea6425197fede025646
- Full Text :
- https://doi.org/10.3390/wevj7010025