Method for quantifying a degradation mode of a lithium-ion cell

Abstract

Method for quantifying a degradation mode of a lithium-ion cell. This method comprises: - the construction (120) of a first curve representing the evolution of the first derivative of the voltage across the cell terminals with respect to the cell capacitance, or representing the evolution of the first derivative of the cell capacitance with respect to the voltage across the cell terminals; - the construction (120) of a second curve representing the evolution of the first derivative of the cell entropy variation with respect to the cell capacitance; and then - the quantification (124) of the degradation mode as a function of the difference between the position of a first motif of interest in the first curve and a first reference position, and as a function of the difference between the position of a second motif of interest in the second curve and a second reference position. Fig. 4