Dresden 2017 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 19: SYLI: Symposium Interfacial Challenges in Solid-State Li Ion Batteries - sulphate- and phosphate-based electrolytes

MM 19.1: Vortrag

Montag, 20. März 2017, 17:15–17:30, IFW A

Aliovalent substitution in garnet type solid-state electrolytes for solid-state lithium-ion batteries — •Anja Paulus1, Maike Wirtz1, Sabrina Heuer1, Peter Jakes1, Hans Kungl1, and Rüdiger Albert Eichel1,21Fundamental Electrochemistry (IEK-9), Institute of Energy and Climate Research, Forschungszentrum Jülich GmbH, D-52425 Jülich, Germany — 2Institut für Physikalische Chemie (IPC), RWTH Aachen University, D-52074 Aachen, Germany

Conventional lithium-ion batteries consist of an electrolyte containing toxic, flammable organic liquids which lead to several safety issues such as leakage and burning of the battery. In order to overcome these safety issues solid-state electrolytes could be an alternative to obtain powerful lithium-ion batteries. The garnet type electrolyte Li7La3Zr2O12 shows promising properties in terms of high lithium-ion conductivity and a good stability against lithium. There are two modifications known for this material, on the one hand a tetragonal one which is thermodynamically stable at room temperature and on the other hand a cubic high temperature modification. The cubic structure shows a lithium conductivity of two orders of magnitude higher than the conductivity of the tetragonal one. One possibility to stabilize the cubic structure at room temperature or lower temperatures is by aliovalent substitution. Aluminum substitution on the lithium site shows a lithium conductivity of 3.41*10-4 S*cm-1 for Li6.4Al0.2La3Zr2O12 at room temperature [1]. Our focus is to study the influence of aliovalent substitution on the properties of garnet type solid-state electrolytes by various techniques. 1.C.Tsai et al., J. Electroceram., 2015, 35, 25-32.

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