A research team at Osaka University has just created a combination of a "highly transparent paper" (nanocellulose, 90% visible light transmission) and a traditional "white paper" supported by cellulose pulp. Highly transparent electrodes and high visibility white electrolytes, and the production of paper-based electrochromic (EC) displays. The principle of the electrochromic device is that when a voltage is applied to the EC electrode, the ions or electrons enter the EC layer (ionic solution) in the electrolyte, thereby exhibiting the characteristics of staining or decoloring.
(Research picture 1: Osaka University has developed a new "paper" electrolyte)
The known problems of conventional battery discoloration devices are that (1) in order to prevent leakage of the electrolyte, sealing must be done, but the production of the thin film is very difficult; (2) With the evaporation of the electrolyte, EC performance will also have Decreased.
The good news is that the research team led by Hirotaka Koga has succeeded in creating a novel paper electrolyte that supports nonvolatile electrolytes on the surface of paper cellulose through hydrogen bonding.
Its name is 1-butyl-3-methylimidazolium 4-fluoroborate ionic liquid compound (BF4), and furthermore, it is evenly coated with electricity on the entire surface of transparent paper made of nanocellulose. A color-changing functional conductive polymer (PEDOT:PSS).
(Study Diagram 2: Comparison of Traditional Electrochromic Displays with New Paper EC Solutions)
With a sandwich-like sandwich structure, the research team developed an EC paper device. This electrochromic solution not only solves the previously mentioned problems, but also possesses the flexibility and pliability of paper.
In addition, a white paper electrolyte with a high optical emission coefficient also improves the visibility of the EC display. The research team claims that it can take into account traditional writing media as well as electro-display features.
(Study Diagram 3: Functional Molecules Play an Important Role in the Development of High-Performance Composites)
Combined with other paper-based electronic devices successfully developed, such as memory, transistors, antennas, and super capacitors, we can create a new type of "paper electronic books."
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