The LiNixCoyMnzO2 (NCM, x+y+z=1) cathode materials for lithium-ion batteries (LIBs), are at the forefront of advancements in various emerging technologies within the power and energy storage sectors. However, the diffusion-induced stresses resulting from lithium-ion intercalation and deintercalation can lead to mechanical damage in NCM polycrystalline particles and consequently impact the overall battery cycle life. This study employs finite element simulations and experiments to investigate the initiation and evolution of intragranular and intergranular cracks in NCM polycrystalline particles under different charging-discharging conditions. This work contributes to a deeper understanding of the mechanical responses of NCM materials within LIBs, it highlights the potential for optimizing battery cycling conditions to mitigate crack-related degradation, thereby extending the lifespan of lithium-ion batteries in practical applications.
Keywords lithium-ion batteries, NCM polycrystalline particles, intragranular and intergranular crack