Citation: Yingyu Chen, Zhen Wang, Bowen Fan, Chenyang Zhang, Shanlin Li, Xueqing Tang, Yaowu Li, Xiaoyu Wang, Changhong Wang, De Li, Shan Cong, Zhigang Zhao. Temperature-tolerant electrochromic devices enabled by LiCl water-in-salt electrolyte with excellent performance[J]. Chinese Chemical Letters, ;2026, 37(4): 110824. doi: 10.1016/j.cclet.2025.110824 shu

Temperature-tolerant electrochromic devices enabled by LiCl water-in-salt electrolyte with excellent performance

Yingyu Chen ^a ,
Zhen Wang ^{a, *,} ,
Bowen Fan ^a ,
Chenyang Zhang ^b ,
Shanlin Li ^a ,
Xueqing Tang ^c ,
Yaowu Li ^c ,
Xiaoyu Wang ^{b, *,} ,
Changhong Wang ^d ,
De Li ^a ,
Shan Cong ^c ,
Zhigang Zhao ^{c, *,}

a.
Key Laboratory of Research on Utilization of Si-Zr-Ti Resources of Hainan Province, School of Materials Science and Engineering, Hainan University, Haikou 570228, China
b.
School of Physics and Optoelectronic Engineering, Hainan University, Haikou 570228, China
c.
Nano Science and Technology Institute, University of Science and Technology of China, Suzhou 215123, China
d.
School of Materials Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China

zwang2020@hainanu.edu.cn

xiaoyuwang@hainanu.edu.cn

zgzhao2011@sinano.ac.cn

Received Date: 22 October 2024
Revised Date: 20 December 2024
Accepted Date: 6 January 2025
Available Online: 31 January 2025

Figures(4)

Reversible modulation of the transmittance in electrochromic devices (ECDs) holds tremendous potential for energy-saving windows. The choice of electrolyte significantly influences the optical modulation, coloring response speed, coloring efficiency, and cycling stability of electrochromic devices. Moreover, traditional electrolytes are prone to instability under extreme temperature conditions, leading to device failure and severely limiting the widespread application of smart electrochromic windows. This study introduces LiCl water-in-salt electrolyte (WiSE) into tungsten oxide-based ECDs. LiCl WiSE exhibits wide-temperature tolerance and excellent ion conductivity. Therefore, the constructed tungsten oxide ECD demonstrates large optical modulation (76.2%@700 nm), fast response time (t_c = 2.0 s, t_b = 1.8 s), and high cycling stability (95.8% retention after 1000 cycles). Especially, it operates efficiently over a wide temperature range of -30~80 ℃. This research provides a new approach for electrolyte selection in the fabrication of high-performance, wide-temperature-tolerant ECDs.
- Wide working temperature window,
- Electrochromic devices,
- LiCl water-in-salt electrolyte,
- WO₃
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