Berlin 2018 – scientific programme

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 14: Materials for Energy Storage I (joint session KFM/CPP)

KFM 14.3: Talk

Wednesday, March 14, 2018, 10:20–10:40, EMH 025

Influence of the glass-ceramic synthesis route on the ionic conductivity of the sodium solid electrolyte Na₂O-Y₂O₃-SiO₂ — •Wolfram Münchgesang¹, Dörthe Wagner², Mykhaylo Motylenko³, Jochen Schilm², David Rafaja³, and Dirk C. Meyer¹ — ¹Institut für Experimentelle Physik, Technische Universität Bergakademie Freiberg, 09599 Freiberg, Germany — ²Fraunhofer-Institut für Keramische Technologien und Systeme IKTS, 01277 Dresden, Germany — ³Institut für Werkstoffwissenschaft, Technische Universität Bergakademie Freiberg, 09596 Freiberg, Germany

The development of room-temperature solid electrolytes (SEs) is one of the keys for the realization of solid-state batteries – a post lithium-ion technology, with probably better performance than this. For SEs, a glass-ceramic synthesis route (GCSR) is particularly suitable, because this is less expensive than other production methods and can be used on an industrial scale.

The maximum achievable conductivity (C) of SEs is determined by the used ionic-conductive phase (ICP), which is crystalline Na₅YSi₄O₁₂ in our case. In practice C is strongly influenced by the microstructure of the SE, in particular by the formation of a suitable percolation path; which is determined by the ratio of the ICP and its crosslinking. We will present the influence of different GCSRs on the microstructure of the SE and the resulting conductivity change.

This work was financed by the Federal Ministry (FM) of Education and Research within the project SyNeSteSia (05K14OFA) and the FM for Economic Affairs and Energy within the project BaSta (0325563).