Conditions favoring accelerated aging and the aging knee

Determine which battery technologies, degradation mechanisms, and operating conditions favor accelerated aging or the appearance of an aging knee in reused lithium-ion batteries, and improve the modeling and prediction of this phenomenon.

Background

The paper discusses the aging knee as a rapid decrease in battery capacity near the end of life. It attributes the phenomenon to complex interactions among degradation mechanisms and notes that its occurrence depends on battery technology and experimental conditions. Identifying the conditions that trigger accelerated degradation is necessary for designing safe and durable second-life operating strategies and for developing predictive aging models.

References

The article also points out that the modeling and prediction of this phenomenon remain uncertain and essentially highlights the fact that further research is needed to better understand this phenomenon. An important research gap to fill is to determine what conditions tend to favor accelerated aging or knee apparition.

— Battery Second Life : A Review of Experimental Studies  (2610.11632 - Hassini et al., 8 Oct 2026) in Section 4.1, “Open research questions”