University of Massachusetts Scientists Significantly Improve Polymer Chain Energy Storage Efficiency
A team from the University of Massachusetts developed a polymer-based energy storage system that releases energy as heat when needed. Scientists say their system utilizes polymer chains arranged like Christmas lights and can achieve twice the storage density of previous polymer-based systems.
A new battery being developed by scientists at the University of Massachusetts provides a new alternative to lithium batteries. This type of battery stores energy in chemical bonds, releasing heat rather than electricity.
According to a report in the "Science Report" magazine, this system can achieve an average storage density of 510 J/g, and can reach a maximum of 690 J/g. The previous polymer energy storage system was only 200 J/g. "We could theoretically achieve a storage density of 800 J/g, but no one can make it," said Dhandapani Venkataraman, professor of chemistry at the University of Massachusetts. "This article reports that we have reached one of the highest energy storage densities of polymer systems." ."
This system was built on the results of an earlier study by MIT professor Jeffrey Grossman. He proposed to arrange molecules around the carbon nanotubes, which allows scientists to manipulate the behavior of molecules to determine the absorption and release of energy.
The researchers are based on Grossman's idea of ​​control arrangements but chose flexible polymers instead of carbon nanotubes. "You can't shorten the distance between carbon nanotube molecules," Venkataraman explained. "We thought that the structure of polymer chains like Christmas lanterns would make azobenzene clusters closer together and affect each other. That is when they get energy and become more stable."
Although the initial results were very successful, through further experiments, the team could not explain why the choice of solvent treatment increased the energy storage efficiency. "We believe that the distance between the light bulbs on the line (the molecules on the analog chain) is the most important. But more importantly, many lines and their lights are arranged," Venkataraman continued. "It turns out that the processing solvent we use basically ensures the maximum storage density."
The team stated that there are still some practical issues related to charging and will now focus on research. This technology can be applied on solar panels. Solar panels collect energy during the day and are used to heat or cook after dark.
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