Thermal gradients inside Lithium-Ion batteries are responsible for current inhomogeneities that accelerate cell degradation. For this reason, accurate thermal modelling is key to designing more reliable cells and packs and a thermal model should be able to predict heat generation accurately. Heat generation consists of reversible and irreversible contributions, the reversible component being governed by entropy change during charge and discharge. Therefore, characterisation of the entropic profile is a necessary building block of thermal models.
In this work, we present a library of BoL entropic potential profiles measured from a range of representative lithium-ion chemistries, including 5 cathodes, 3 anodes and the corresponding 7 custom-made full cells. Experimental measurements are performed by the temperature stepping method, keeping half cells and full cells in electrochemical equilibrium during the measurement. The uncertainty of each data point is estimated individually. Full-cell entropic potentials are both reconstructed from half-cell potentials and measured directly, evidencing how changes in cell balancing can affect the cell’s overall entropic potential. The dataset also shows that the graphite anode dominates, largely determining the resulting full-cell entropic potential profile.