Coupled nonlinear stress and electric field numerical simulation for all-solid-state lithium-ion batteries

Abstract

An accurate analysis of ion transportation in an all-solid-state battery is crucial to improve and estimate performance. For an all-solid-state battery using sulfide solid electrolytes, coupling the stress and electric field simulations is required because the battery is pressurized, this affects the void space, which then affects ion transportation. In this paper, we propose a new method to analyze the ionic conductivity in a pressurized all-solid-state battery by coupling nonlinear stress analysis and electric field analysis. The nonlinear stress analysis can estimate the stress distribution of solid electrolyte and it was found that nonlinear stress-strain characteristics that originate from the voids diminished with increased pressure. The numerical results based on a model-electrode were nearly identical to the experimental results. • Numerical simulation method with nonlinear FEM and FVM are proposed. • Nonlinear mechanical characteristics of SE are simulated with nonlinear FEM. • The numerical results are validated with EIS and X-ray CT measurements. • The numerical and experimental results are in good agreement.