New progress in research on rechargeable "paper batteries"

With millions of nanofibers and a conductive polymer coating package, scientists have created "power papers" that can store large amounts of charge. It can be recharged hundreds of times and it takes only a few seconds to charge. It is very lightweight and does not require the addition of toxic chemicals or heavy metals during the creation process. Ultimately, it will be able to provide a variety of forms of renewable energy for a variety of devices. Linkoping University's Organic Electronics Laboratory in Sweden said that in addition to retaining the characteristics of ordinary paper, 'paper batteries' also have a certain degree of plasticity.

Scientists have created 'battery papers' that can store large amounts of electricity. They are lightweight, extremely thin, and foldable, or they may someday provide power to modern ultra-thin electronic devices.

The researchers demonstrated the flexibility and strength of the 'paper battery' and even stated that they could use a 'paper' to fold the paper cranes. Only a new 'paper battery' with a width of 15cm and a thickness of 0.1mm can store the charge of a farad capacitor (similar to a supercapacitor).

The laboratory took down four world-class supercapacitor records—[1] the highest organic electron charge and capacitance (1 Coulomb 2 Farah); [2] the highest measured organic conductor current (1 amp); 3] The highest simultaneous ion and electron energy; [4] The highest transistor transconductance.

Some of the researchers in the organic electronics laboratory (far right is Xavier Crispin).

Xavier Crispin, professor of organic electronics, said: “The film in the form of a capacitor has existed for some time. What we have done is to produce this material in three dimensions and we can create thick sheets of paper.”

Its main building material is nanocellulose, which breaks down cellulose into fibers about 20 nm in diameter. These nanocelluloses are then soaked in a solution containing the charged polymer PEDOT:PSS.

Jesper Edberg and Isak Engquist mixing 'paper batteries' in the lab.

Jesper Edberg, a doctoral student at Linköping University in Sweden, said: "The covered fibers are entangled and the liquid in the void acts as an electrolyte." This kind of paper battery has a special energy storage capacity, researchers will continue to study to develop a higher capacity.

The preparation of the new paper battery is the same as the traditional paper using fiber pulp (the same dehydration method), but the biggest challenge is how to adapt to this process in industrialization.

Pour the 'paper cell' on the petri dish.

Prof. Berggren said: "In cooperation with KTH, Acreo and Innventia, we have just received 34 million kronor from the Swedish Strategic Research Foundation to continue to explore a reasonable production method, namely a paper machine for paper batteries."

Since 2012, this research has been funded by the Knut and Alice Wallenberg Foundation. In addition, the project includes researchers from the Royal Institute of Technology in Sweden, Innventia, Technical University of Denmark, and the University of Kentucky.

The details of this study have been published in the recently published "Advanced Science" journal.

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