CR2032 button cell battery

Discussing the foldable CR2032 button cell battery developed by the United States with a 14-fold increase in capacitance

According to foreign media reports, scientists at the University of Arizona in the United States have developed a paper-based CR2032 button cell battery that can be folded in half or folded into a Miura-ori shape (similar to the map folding method) many times. Since it becomes smaller after folding, the surface energy density and capacitance can be increased by 14 times. This foldable paper-based battery is flexible, low-cost, and can be manufactured on a roller, and is expected to be further developed into a multi-purpose high-performance battery. The relevant paper was published in the recently published "Nano Express".

Traditional lithium-ion batteries use lithium-based powder as electrodes, while this foldable CR2032 button cell battery uses carbon nanotube (CNT) ink as electrodes, and uses thin and breathable Kimwipes paper towels (a kind of laboratory paper towel) as a substrate, and a layer of PVDF (polyvinylidene fluoride) coating is applied to enhance the adhesion between the CNT ink and the paper substrate. Finally, the battery showed excellent conductivity and relatively stable capacitance.

The researchers conducted folding experiments on the battery, first with a simple fold in half and then with a more complex Miura-ori folding shape. After simply folding once, twice, and three times, its surface energy density and capacitance are increased by 1.9, 4.7, and 10.6 times, respectively, compared to the unfolded flat battery; the Miura-ori folded type is more efficient: after folding a 6 cm × 7 cm paper battery into 25 layers, the overall area is only 1.68 square centimeters, while the surface energy density and capacitance are increased by 14 times.

"We use 'surface' density to express the increase in energy density per inch of printed area," explained Candice Zhan, co-author of the paper and associate professor of materials science and engineering at the school. "This is different from the energy density of weight. Because the mass of the battery does not change when folded and unfolded, the 'surface' density is more clear about which density we are referring to."

With the development of geometric folding algorithms, computer tools, and robotic operations, more complex folding types will be developed for large-scale manufacturing and commercial use. Zhan said that combining origami concepts with paper-based energy storage devices will bring about updates in shape, geometric design, and function, and there are endless possibilities in this regard. In the future, foldable devices with integrated power sources and other components will be developed.

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