Regensburg 2019 – wissenschaftliches Programm

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 9: Focus: Materials for Energy Storage

KFM 9.5: Hauptvortrag

Dienstag, 2. April 2019, 11:20–11:50, PHY 5.0.21

Storing electrical energy using glasses and glass ceramics — •Martin Letz — SCHOTT AG, Hattenbergstr. 10, 55122 Mainz, Germany

Power electronics is a strongly growing field since highly fluctuating demand and supply of electrical energy needs efficient electronics for switching or for transformation between different voltage levels. In this situation the classes of materials, glasses (i) and glass ceramics (ii), which are nearly ever used as dielectrics for capacitors can enable innovations. Recent technical development makes it possible to produce ultrathin glasses (i) with extremly large dielectric breakdown strength up to 600 kV/mm which enable high storage densities at elevated temperatures. Glass ceramics (ii) allow to reach higher polarizabilities and are produced in a two step process. In a first step a transparent glass with a solely amorphous structure is molten. In a second and independent step crystallites are grown in such glasses by applying a well defined time--temperature profile. By growing nanosized crystallites with ferro- or para-electric phases, pore free dielectric materials with very high homogeneity and high dielectric strength can be obtained. We present two types of such material. Besides capacitors there are further fields of applications for glasses and glass ceramics in improving saftey and storage density of batteries.