With the rise of wearable electronic devices, flexible thin-film thin-film batteries have become a hot topic for scientists. New technologies including organic semiconductor thin-film transistors have emerged, but due to limitations such as stability, they cannot be applied to actual products. According to a report by the Physicist Organization Network, a study published in the "Applied Physics Letters" recently proposed a new scheme, the zinc manganese dioxide battery.
At present, many studies are devoted to improving the availability of organic semiconductor thin film transistors. However, after efforts, people have found that such devices have low flexibility, long chemical bonds, and thick dielectric layers and cannot meet the needs of practical applications. Therefore, alkaline chemical batteries like zinc dioxide have gained more attention.
A major driving force behind the development of thin-film printed batteries is that they can be produced by manufacturing lines that manufacture the remaining components of flexible electronic devices, thereby increasing integration and lowering production costs. Compared to lithium-ion batteries, alkaline batteries are more environmentally friendly, do not require sealing, and cost less. Alkaline chemical battery manufacturing, the use of stencil printing on the fiber substrate, can be flexed, can drive flexo printed circuit, and meet the required performance characteristics.
In the new study, using a special manufacturing process, the researchers were able to connect 10 units of batteries in series to form a series circuit with a peak voltage of 14 volts and a capacity of 0.8 milliampere hours. This new type of thin film battery can use polyvinyl alcohol or polyvinyl cellulose film which is currently commercially available as a raw material, and uses a 100 μm thick film to separate zinc and manganese dioxide electrodes and become a substrate thereof. A hydrophobic fluoropolymer solution (Teflon AF) was printed between the two electrodes to reduce electrolyte migration and contact with electrodes in other adjacent cells. Different cells are connected with a printing ink containing silver.
The researchers tested the battery with a 100 kΩ resistor. The 0.8 mAh battery discharged for 7.5 hours and the voltage dropped from 14 volts to 10 volts. In order to determine their performance in a real printed circuit, they also tested the battery in a similar way to the actual use environment. The researchers used a simple circuit consisting of five inverters connected end to end. The output of the circuit was sensitive to the supply voltage and the delay of the circuit. The results show that the voltage waveform of this circuit is maintained at around 13 volts in the measurement in units of 10 milliseconds. After 20 minutes, no change was detected over this range, indicating that the new battery has a more stable power supply capability. The researchers said that more complex circuits may require more energy to drive, but the new zinc manganese dioxide battery provides at least another option outside the existing printed battery. (Wang Xiaolong)
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