With the rise of wearable electronic devices, ultra-thin printed thin-film batteries with flexibility have increasingly become a hotspot for scientists. New technologies, including organic semiconductor thin-film transistors, have emerged, but they cannot be applied to actual products due to stability and other limitations. According to the physicist organization network report, a study published in the "Applied Physics Letters" recently, proposed a new scheme-zinc manganese dioxide battery.
At present, many studies are devoted to improving the usability of organic semiconductor thin-film transistors, but after efforts, people have found that such devices have low flexibility, long chemical bonds, and thick dielectric layers, which cannot meet the needs of practical applications. Therefore, alkaline chemical batteries similar to zinc manganese dioxide have received more attention.
A major driving force for the development of thin-film printed batteries is that they can be produced through production lines that manufacture the remaining components of flexible electronic devices, thereby improving integration and reducing production costs. Compared with lithium-ion batteries, alkaline batteries are more environmentally friendly, require no sealing, and have lower costs. The manufacture of alkaline chemical batteries uses stencil Printing on the fiber substrate, which can be bent, can drive flexographic printed circuits, and meet the required performance characteristics.
In the new study, through the use of a special manufacturing process, the researchers were able to connect 10 cells 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 the currently commercially available polyvinyl alcohol or polyethylene cellulose film as a raw material, and use a 100-micron-thick film to isolate the zinc and manganese dioxide electrodes and become its substrate. A hydrophobic fluoropolymer solution (Teflon AF) is printed between the two electrodes to reduce electrolyte migration and contact with electrodes in other adjacent cells. Different unit cells are connected with silver-containing printing ink.
The researchers conducted a discharge test of this battery with a resistance of 100 kiloohms. The battery of 0.8 mAh was discharged after 7.5 hours, and the voltage dropped from 14 volts to 10 volts. In order to determine its performance in a real printed circuit, they also conducted tests on the battery similar to the actual use environment. The researchers used a simple circuit consisting of five inverters connected end to end for testing. The output of this circuit is very sensitive to the supply voltage and the delay of the circuit. The results show that the voltage waveform of this circuit is kept at about 13 volts in the measurement in units of 10 milliseconds. After 20 minutes, no changes beyond this range were detected, which indicates that the new battery has a relatively stable power supply capability. The researchers said that more complex circuits may require more energy to drive, but the new zinc manganese dioxide battery at least provides people with an alternative to existing printed batteries.
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