Lithium-ion battery degradation: Comprehensive cycle ageing data and analysis for commercial 21700 cells

High quality open-source battery data is in short supply and high demand. Researchers from academia and industry rely on experimental data for parameterisation and validation of battery models, but experimental data can be expensive and time consuming to acquire, and difficult to analyse without expert knowledge. Here we present a comprehensive open-source dataset for the cycle ageing of a commercially relevant lithium-ion cell (LG M50T 21700) with an NMC811 cathode and C/SiOx composite anode. 40 cells were cycled over 15 different operating conditions of temperature and state of charge, accumulating a total of around 33,000 equivalent full cycles. Analysis of the ageing behaviour includes metrics such as capacity fade, resistance increase, and degradation mode analysis. The presentation of the dataset here is complemented by a statistical analysis of the cell performance, both at beginning of life and as a function of age. This provides a valuable resource for those working on battery performance and ageing.