Phase-field simulation of Li dendrites with multiple parameters influence

Abstract

Lithium metal has been regarded as a promising anode material for high theoretical energy batteries. However, the growth of lithium dendrites hinders its commercialization. Lithium dendrite may cause the battery internal short circuit, thermal runaway, even explosion, and other disasters. Here a phase-field model is established to investigate the influence of the Li-ions concentration, anisotropic strength, noise, and internal heat on the growth behaviors of the lithium dendrite. Increasing the consumption of Li-ions concentration, the growth rate of dendrite is faster and the morphology is close to mossy. Adjusting the appropriate anisotropic strength can effectively improve the dendrite structure and reduce the formation of dendrites. Large noise accelerates the formation of dendrite nucleation sites and disordered dendrites. The lithium dendrites grow in the direction of high temperature gradient caused by internal heat. The mechanism of pore evolution with time along with dendrite growth has also been studied.