Analysing the entropy of lithium-ion cells to trace anodic half-cell ageing

Mertin, G.K. and Wycisk, D. and Stadler, J. and von Kessel, O. and Richter, E. and Oldenburger, M. and Wieck, A.D. and Birke, K.P.

Volume: 50 Pages:
DOI: 10.1016/j.est.2022.104109
Published: 2022

The full-cell entropy and its temperature dependency were measured for automotive lithium-ion cells with a graphite anode in dependence of the state of charge. Resulting entropy curves can be related to certain characteristic conditions of the graphite anode. Those characteristics are induced by a certain lithium-ion concentrations within the graphite. Comparing the entropy curves of fresh to aged cells shows a shift in the characteristics of these curves at a similar charge input. Those shifts were assigned to a change in the anodic net capacity, enabling an entropy based state of health estimation of the anode. The execution of the differential voltage analysis leads to similar results. © 2022 Elsevier Ltd

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