A Scalable, Robust Polyvinyl‐Butyral‐Based Solid Polymer Electrolyte with Outstanding Ionic Conductivity for Laminated Large‐Area WO3–NiO Electrochromic Devices

Author:

Wang Xueqi12,Yang Ye1ORCID,Jin Qiongya1,Lou Qicun1,Hu Qizhao1,Xie Ziling1,Song Weijie13

Affiliation:

1. Zhejiang Provincial Engineering Research Center of Energy Optoelectronic Materials and Devices Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo 315201 P. R. China

2. University of Chinese Academy of Sciences Beijing 100049 P. R. China

3. Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering Changzhou 213164 P. R. China

Abstract

AbstractPolyvinyl butyral (PVB) is a well‐established polymer interlayer material that has been used in laminated safety glass panels for over 80 years. However, its intrinsically poor ionic conductivity (σ) severely restricts its widespread application as a solid polymer electrolyte (SPE) for laminated WO3–NiO electrochromic devices (ECDs). Here, a new strategy for significantly improving the σ of PVB via a cross‐linking reaction with 3‐glycidoxypropyltrimethoxysilane (KH560) is presented. The cross‐linked PVB‐SPE with 10 wt.% KH560 exhibits the highest room‐temperature σ value among the investigated samples (1.51 × 10−4 S cm−1), which is also higher than that of previously reported PVB‐based SPEs (10−5–10−7 S cm−1). Additionally, the prepared SPE exhibits comprehensive optical, mechanical, and thermal performances, including a high visible transmittance (>91%), relatively high adhesive strength (2.13 MPa), and superior thermal stability (up to 150 °C). Laminated WO3–NiO ECDs with dimensions of 5 × 5 cm2 and 20 × 20 cm2, fabricated by leveraging the aforementioned properties of the electrolyte, operate stably at temperatures ranging from −20 to 80 °C, underscoring the potential of the PVB‐SPE for realizing commercially viable large‐area ECDs.

Publisher

Wiley

Subject

Electrochemistry,Condensed Matter Physics,Biomaterials,Electronic, Optical and Magnetic Materials

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