With the deployment of more and more large batteries on the grid addressing different
applications, it is essential to better understand their degradation pattern and to accurately
forecast their durability. In this work, the electrochemical data from a laboratory testing
experiment replicating real usage was extensively investigated using incremental capacity
and variance analyses. Results showed that the degradation of these cells is much more
complex than what the capacity loss and the resistance increase indicated. A significant …

Battery Energy Storage Systems (BESSs) can facilitate renewable energy sources
integration onto the grid. For this application, these systems are expected to last for a
decade or more, but the actual battery degradation under different real-world conditions is
still largely unknown. In this work, three years of lithium titanate BESS usage in Hawai'i were
analyzed. In addition, the representative usage was subjected on individual cells under
controlled laboratory conditions to study the degradation mechanisms and enable life …