Patterned thin film electrode for high energy density lithium ion battery has been attracted many attentions.Experiments found that delamination between the island electrode and current collector would occur in charge-discharge cycling when the island size is larger than a critical value.It would seriously weaken the electrochemical performance of electrode.By using a semi-analytical method based on cohesive model, we investigate the impacts of the key parameterson time to delamination onset and critical island size, which are two significant variables for avoiding the patterned thin film electrodes delaminating.Further,according to the rigid-substrate assumption, the critical size is derived from the differential equations of active plate.Moreover, a simple approximate solution for critical size is also provided.It is found that there are two modes of delamination onset, i.e.sliding and opening.Large charging load may transform the delamination mode from sliding to opening.The analyses also identify that the critical size for delamination simply depends on interface properties and maximum volumetric change.