Self-discharge kinetics behaviors of the Li-Si anode for thermal batteries: Modeling, quantifying and fitting analysis

•Self-discharge kinetics behavior of Li-Si anode is investigated by theoretical model and experiment.•Effective diffusion coefficients of soluble lithium in porous electrode are determined to verify the availability of model.•Effects of temperature, discharge current and electrode thickness on self-discharge kinetics behavior are discussed.•The three factors are coupled in the form of arrhenius equation by multivariate nonlinear regression.