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have been developed, ranging from traditional metal oxides to more recent organic polymers, small molecules, and hybrid materials. Moreover, benefit from the ECD design and structural optimization, flexible substrate‐based devices were fabricated with the low‐price roll‐to‐roll process, which makes the EC technology have large scope applications, such as smart windows for reducing building energy consumption, self‐powered EC window using organic photovoltaic cells as power supplement, car rear‐view mirrors for greater safety, and smart sunglasses for better UV‐radiation protection. Many of these technologies and applications have been commercialized and are available on the market. With the concerted efforts of researchers and engineers, we believe that the new EC materials and advanced technologies will constantly develop and more advanced ECD with low manufacturing cost will be exploited to realize practical applications.

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      2.1 Introduction

      In general, electrolytes can be classified into PEs, liquid electrolytes, ceramic electrolytes, and solid inorganic electrolytes [4–6]. Briefly, PE is a membrane composed of a dissolution of salts in a polymer matrix with high molecular weight [7]. PE is widely applied in electrochemical devices such as solid‐state batteries and rechargeable batteries, ECDs, supercapacitors, fuel cells, dye‐sensitized solar cells, and EC windows. Technologically, PEs evolved from polymer, liquid ionic conductor and solid‐state

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