| Popis: |
Inorganic solid electrolytes are naturally less ionically conductive at room temperature than at elevated temperatures where they can be superionic. This intrinsic Arrhenius-type behavior is useful for niche applications that require a thermally activated switch, for example in batteries with long room temperature storage lifetimes, geothermal batteries, or novel circuits. We seek electrochemically stable materials with poor room temperature ionic conductivities and high activation energies, starting with the lithium-stuffed garnet class of solid electrolytes (Li5+xM3N2O12+0.5x). To efficiently identify attractive dopants, we seeded a machine learning algorithm with attributes published in the available literature. This approach confirmed the lithium concentration and dopant electronegativities are important parameters in materials design. We then have explored these predicted relationships through garnet materials synthesis and electrochemical impedance spectroscopy measurements up to 400 oC. Sandia National Laboratories is a multimission laboratory managed and operated by National Technology and Engineering Solutions of Sandia, LLC., a wholly owned subsidiary of Honeywell International, Inc., for the U.S. Department of Energy’s National Nuclear Security Administration under contract DE-NA-0003525. |
