Characterization of a commercial Nickel-Rich/Silicon-Graphite battery, under long term static and dynamic cycling

Given the rising importance of energy storage for the technological future, the development of new storage technologies becomes critical. Lithium-ion batteries are a promising technology, in particular for electric mobility, because of their high energy density and specific energy. Among the different lithium technologies, the use of nickel-rich NMC positive electrodes and silicon-graphite negative electrodes (NMC/Si-Gr) allows for notably high specific energy values. However, this battery technology can have a short cycle life under certain conditions. As cycle life is a key issue for automotive applications, it is important to evaluate which factors can lead to an earlier degradation of NMC/Si-Gr batteries. This paper provides a long term cycling study of a commercial NMC/Si-Gr battery, including different types of cycling conditions, both static and dynamic, with the aim to identify which factors can shorten the cycle life of the technology. The state of health of the cells is measured and analyzed via capacity measurements and electrochemical impedance spectroscopy.