Imagine you are now in a parking lot, where cars are piled up at the gates. New cars can easily enter, but it is difficult for those already there to get out when needed. With the process repeated, the efficiency of using the parking lot decreases.
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As things became complicated, someone came along and reorganized the gates and passageways to make the movement of cars smoother.
Similarly, zinc and manganese dioxide batteries face the same problem, and researchers from the National Laboratory of Chemical Engineering at the School of Chemistry, Beijing University of Chemical Technology, have sought to solve it with similar ideas, which were announced in the journal "Nano Micro Letters".
Traditional zinc and manganese dioxide batteries are widely used in everyday devices, such as watches, remote controls, toys and flashlights, because they are easy to use and readily available.
The solution that the Chinese researchers resorted to in order to treat the problem of these batteries was to introduce single atoms of cobalt into the structure of manganese dioxide, then they changed the electronic environment and atomic bonds within the material, and helped the chemical reactions to proceed in multiple paths, so that the active material could be better utilized when repeatedly charged and discharged. That is, they did not add cobalt just to increase the amount of material, but used it to change the way the original material worked.
According to the study, the new mechanism helped achieve a specific capacity of 658 milliampere-hours per gram, in addition to exceeding 15,000 charge and discharge cycles.
These results suggest that controlling the electronic state of transition metals, along with modifying the atomic structure of the materials used in electrodes, could represent a promising path for developing batteries with high storage capacity and longer operating life.
The solution is inside the battery.
The researchers emphasize that these figures reflect the battery's performance under the test conditions under which the study was conducted, and are not sufficient on their own to prove its readiness for commercial use, as this requires an assessment of the battery's overall efficiency, stability, safety, and the material's large-scale manufacturing capabilities.
The study confirms that innovation highlights the importance of moving from simply changing the components of the battery to engineering the behavior of the atoms and electrons within it, in order to make greater use of the active materials and improve its ability to store and recover energy through repeated use cycles.
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