The preparation technology and limited performance of ion conducting (IC) layers are the two main obstacles for electrochromic devices (ECDs) toward commercial application. In this work, the Li x AlO z films were fabricated by direct current (DC) magnetron sputtering with a Li–Al alloy target and show promising potential as an IC layer in ECDs owing to their high transparency, ultrahigh stability, and good ionic conductivity. The integrated all-solid-state ECDs, with the structure of ITO/NiO x /Li x AlO z /WO3/ITO, manifest less leakage current density (<10 mA/cm2), high optical regulation (ΔT = 74.4%), excellent cyclic stability (changing less than 10% after 104 cycles), and short response time (5.7 s for coloring time, 2.2 s for bleaching time). A large-scale ECD with the area of 10 × 10 cm2 was fabricated and displayed remarkable potential as a commercial application for dynamic windows.

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