To evaluate the performance of solid electrolytes, we analyzed the dynamic behavior of Li + for the interfacial models. The Li + diffusion coefficients were computed for three spatial regions-crystal, glass, and interfacial regions-as shown in Fig. . The boundary between the crystalline and glassy phases was defined as the midpoint of P coordinates between the glassy and crystalline PS 4 3units. The interfacial region was defined as a width of ±10 Å centered at the glass-crystal boundary. The Li + self-diffusion coefficients (D) in the three regions were computed using the velocity-velocity autocorrelation function, G(t):