Discrete element modelling of the mechanical evolution of a lithium-ion battery electrode layer following charge cycling
Axel Lundkvist, Per‐Lennart Larsson, Erik Olsson
Abstract
Mitigating the loss of charge capacity is one of the main challenges in developing lithium-ion batteries. Mechanical degradation is one of the causes of charge capacity loss, and insight into these processes is necessary for battery development. This study uses a discrete element method (DEM) framework to model the mechanical properties of a positive electrode active layer. In particular, how the active layer properties are affected by the volumetric change and material degradation of the active material linked to charge cycling. The results show a stiffening of the active layer following charge cycling, stemming from the volumetric expansion of the active particles. These results agree with trends seen in experimental measurements. • DEM model for assessing Li-battery electrode's mechanical properties under charging • The model explores the impact of NMC volumetric change related to charge cycling. • Volumetric expansion of NMC leads to a stiffer electrode layer.