Calendar and cycle aging dataset for lithium-ion batteries with multi-SOC electrochemical impedance spectroscopy measurements.

This paper presents a comprehensive dataset of 22 NMC/graphite lithium-ion batteries subjected to both calendar and cycle aging under controlled operating conditions. The cells were aged at 0 °C, 25 °C, and 40 °C for a duration of 90 days. Periodic reference performance tests (RPTs) were conducted throughout the aging process. Each RPT included a capacity test and an electrochemical impedance spectroscopy (EIS), both performed at 25 °C. EIS was repeated at state-of-charge (SOC) values of 0 %, 25 %, 50 %, 75 % and 100 %. Cycle-aged cells were operated between various voltage limits at two distinct charging rates, while calendar-aged cells were stored at either 80 % or 100 % state-of-charge (SOC). This dataset captures a diverse range of degradation pathways. It can be used to develop and validate battery aging models, state-of-health (SOH) estimation algorithms, and support the design of predictive maintenance strategies for lithium-ion battery systems.