Abstract
This study addresses the challenges associated with lithium-ion battery fast charging at a low temperature. A number of commercially available 18650 Li-ion cells were selected and comparatively tested for fast charging at different temperatures. Whereas a majority of the cells were able to fast charge efficiently at 23 °C, their fast charging capabilities decreased significantly at lower temperatures. Interestingly, the five best cells included energy, balanced and power cells. The best cells were repeatedly charged at a 2C rate for 300 cycles, leading to varying performance profiles, strongly depending on the temperature. A post-mortem analysis was carried out for the cells fast charged at −10 °C to investigate the failure modes. Even though several degradation modes were observed, the main cause for performance decay and cell failure was a loss of lithium inventory caused by an abnormal growth of the anode solid electrolyte interphase (SEI). Lithium plating and graphite exfoliation were determined to be the main causes for SEI growth. Finally, a comparative analysis was performed on the battery component choices and manufacturing parameters, which provides guidance towards the manufacturing of cells more capable of sustaining repeated fast charges at ambient and low temperatures.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.