Experimental degradation study of a commercial lithium-ion battery

196 cells from the same production batch of commercial 18650 cells of type US18650VTC5A by Sony/Murata with a nominal capacity of 2.5 Ah were aged under different conditions. The anode active material is silicon-graphite (SiG) with 1.4 wt% silicon and the cathode active material is nickel-cobaltaluminum (NCA) with the formulation LiNi0.80Co0.15Al0.05O. All CU measurements were performed using BaSyTec cell test systems (CTS). Additionally, for cycling with higher currents, the BaSyTec XCTS MKII was used. Measurements were performed at the Institute of Automotive Technology (Technical University of Munich)     «

196 cells from the same production batch of commercial 18650 cells of type US18650VTC5A by Sony/Murata with a nominal capacity of 2.5 Ah were aged under different conditions. The anode active material is silicon-graphite (SiG) with 1.4 wt% silicon and the cathode active material is nickel-cobaltaluminum (NCA) with the formulation LiNi0.80Co0.15Al0.05O. All CU measurements were performed using BaSyTec cell test systems (CTS). Additionally, for cycling with higher currents, the BaSyTec XCTS MKII w...     »

In this study, we analyze data collected during the aging of 196 commercial lithium-ion cells with a silicon-doped graphite anode and nickel-rich NCA cathode. The cells are aged over a large range of calendar and cycle aging conditions. For different cells, these conditions are constant, alternating or randomly changing. The total test time and reached cycles are 697 days and 1500 equivalent full cycles for the calendar and cyclic aging tests respectively. A periodic check-up procedure was consistently performed at 20 °C controlled temperature, which allows for good comparability between different aging scenarios. During calendar aging, we quantify the influence of the check-up procedure, which significantly increases the aging observed after 697 days. For certain conditions, the degradation induced by the check-up even exceeds the pure calendar aging, which reveals that the lifetime of lithium-ion batteries was underestimated in previous studies and models.     «

In this study, we analyze data collected during the aging of 196 commercial lithium-ion cells with a silicon-doped graphite anode and nickel-rich NCA cathode. The cells are aged over a large range of calendar and cycle aging conditions. For different cells, these conditions are constant, alternating or randomly changing. The total test time and reached cycles are 697 days and 1500 equivalent full cycles for the calendar and cyclic aging tests respectively. A periodic check-up procedure was consi...     »