Dresden 2014 – wissenschaftliches Programm
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DF: Fachverband Dielektrische Festkörper
DF 16: Glasses (Joint Session with CPP and CY)
DF 16.2: Vortrag
Mittwoch, 2. April 2014, 12:05–12:25, WIL B321
Resistive Properties of Lithium-Ion Conducting LiSICon Glass Ceramics in Contact with Lithium Metal and Nonaqueous Electrolytes — •Kim Oliver Hofmann1,2, Meike Schneider2, Maria-Louisa Reich2, Miriam Kunze2, and Michael Vogel1 — 1Institut für Festkörperphysik, Technische Universität Darmstadt — 2Schott AG Mainz
Lithium-ion conducting glass ceramics with LiSICon type crystalline phase are promising materials as solid electrolytes in future batteries due to their high ionic conductivity, which is higher than 1x10−5 S/cm. These materials can not only be applied to solid state lithium batteries but also for lithium-sulfur and lithium-air batteries. For these applications the LiSICon materials need to be stable against metallic Li and battery specific liquid electrolytes.
Lithium contact stability is derived by measuring the impedance Z over a period of seven days. In case the glass ceramic reacts with metallic lithium and reduces the polyvalent ions in the glass ceramic like Ge or Ti, the impedance Z is increasing and the sample turns black, noticeably. Further on the impedance spectroscopy is used to determine the interaction of glass ceramics with different liquid electrolytes. The impedance spectra are additionally analyzed by a distribution of relaxation times, based on a distribution function over infinite serial connected RC elements [1]. The resistance contribution of the glass ceramics in contact with liquid electrolytes can be distinguished in interface, grain boundary and grain core resistance by this method.
[1] H. Schichlein et al., J. Appl. Electrochem., 32 (2002) 875- 882