Cheap supercapacitor electrodes enable coin cells: Page 2 of 2

July 19, 2017 //By Nick Flaherty
Cheap supercapacitor electrodes enable coin cells
Researchers at the University of Washington in the US have developed a fast, cheap method to make supercapacitor electrodes for electric cars and coin cells.

The researchers treated both materials with high-frequency sound waves to break them up into thin sheets and incorporated them into the carbon-rich gel matrix. They could synthesize a fully-loaded wet gel in less than two hours, while other methods would take many days.

After obtaining the dried, low-density aerogel, they combined it with adhesives and another carbon-rich material to create an industrial "dough," which Lim could simply roll out to sheets just a few thousandths of an inch thick. They cut half-inch discs from the dough and assembled them into simple coin cell battery casings to test the material's effectiveness as a supercapacitor electrode.

Not only were their electrodes fast, simple and easy to synthesize, but they also showed a capacitance at least 127 percent greater than the carbon-rich aerogel alone.

Lim and Crane expect that aerogels loaded with even thinner sheets of molybdenum disulfide or tungsten disulfide would show an even better performance but wanted to show that loaded aerogels would be faster and cheaper to synthesize.

The method to trap materials quickly in aerogels could be applied to high capacitance coin cell batteries or catalysis in fuel cells.

www.washington.edu

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