a, XRD patterns and SEM image (scale bar, 20 μm) of the synthesized SC-LiX. The standard XRD pattern of the simulated FAU structure is provided for comparison. The SC-LiX displays a typical octahedral morphology with a particle size of 28 μm. b, N2 adsorption–desorption isotherms and pore-size distributions of SC-LiX (total surface area = 880 m2 g−1, micropore area = 819 m2 g−1, external surface area = 61 m2 g−1, micropore volume = 0.30 cm3 g−1). c, Photograph and micrograph of the test device used for the EIS of SC-LiX. The ionic conductivity was calculated with the formula σ = d/(R × S), in which the value of the resistance R (28,656 Ω) was obtained from the fitted Nyquist plots, the value of the diameter d (2.3 × 10−3 cm) was measured from the SEM image in the inset of a, and S (3.4 × 10−6 cm2) was the adhesion area of the silver electrode for SC-LiX, with the shape of an equilateral triangle. d, EIS spectrum of the synthesized SC-LiX.