High Performance and Excellent Stability of All-Solid-State Electrochromic Devices Based on a Li_1.85AlO_z Ion Conducting Layer

Abstract

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.

A Long‐Life Battery‐Type Electrochromic Window with Remarkable Energy Storage Ability

“…The cycled devices remain still transparent and clear without any detectable precipitation. Although such a cycling stability is inferior to the mature five‐/seven‐layered EC windows, it still outperforms the state of the art of the bifunctional EC windows with significant energy storage ability (Table ). A further comparison of Figure S3, Supporting Information, and Figure d clearly shows the tradeoff between switching speed and cycling stability.…”

Preparation of WO3 Films with Controllable Crystallinity for Improved Near-Infrared Electrochromic Performances

“…Besides transmittance modulation, the response time is also significantly important to assess EC performance of the films, which is defined as the time required for a given material to reach 90% of the maximum transmittance modulation ΔT at a particular wavelength. 43 In this study, the coloration/bleaching switching performance is evaluated by monitoring the in situ transmittance modulation at a wavelength of 1000 nm under a constant voltage of ±0.8 V, and the transmittance-time response curves of WO 3 films are depicted in Figure 5b,d,f. One can find that the coloration and bleaching times of WO 3 -70 are 3.7 and 4.9 s, respectively.…”

Synergistic Effect of Al3+/Li+-Based All-Solid-State Electrochromic Devices with Robust Performance

“…According to the experimental data and the calculation formulation ( d is the thickness of the film, R is the impedance value at the highest frequency, and S is the area of the film), we can get the ionic conductivity of the Al 1.98 SiO 9.79 film of about 6.25 × 10 –8 S·cm –1 . In Tables S4 and S5, we have summarized and compared the ionic conductivities of Li + -based polymer gel electrolytes ,− and inorganic solid electrolytes and the electrochromic performance of ECDs based on them has also been compared. ,− From the above table, we can tell that generally, the polymer gel electrolytes (PGEs) possess an ionic conductivity 2 or 3 orders of magnitude larger than that of the solid electrolytes. However, after being assembled into devices, the corresponding PGE-based electrochromic performance of ECDs does not show absolute superiority over inorganic solid ECDs.…”