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Thursday, March 8, 2018 at 4:00pm to 5:00pm
Kimball Hall, B11 210B Bard Hall
Selenium impregnated monolithic carbons as free-standing cathodes for high volumetric energy lithium and sodium metal batteries
Selenium – lithium (Se-Li) and selenium – sodium (Se-Na) metal systems are emerging as very attractive candidates for “next generation” batteries due to their low cost and high energy. In this work we devised a highly scalable and inexpensive method to effectively double the energy per volume of Se-Li and Se-Na cells by creating monolithic electrodes instead of the usual loosely packed nano or micro powders. Meanwhile the unique architecture based on filling the void space between carbonized cellulose allowed for excellent power and cycling characteristics, as favorable as in state-of-the-art nanostructured materials. In parallel, we performed a detailed electroanalytical study on the Se-Li vs. Se-Na systems and came to a remarkable conclusion that the two are nearly identical. This was a fully confirmed but certainly an unexpected finding, since Na diffuses much more sluggishly than Li in most other battery materials.