Synthesis and electrochemical investigation of garnet-polymer composite electrolytes for solid state batteries
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Other Titles: | Synthese und elektrochemische Charakterisierung von Granat-Polymer Komposit-Elektrolyten für Festkörperbatterien | Authors: | Langer, Frederieke ![]() |
Supervisor: | Kun, Robert | 1. Expert: | Kun, Robert | Experts: | Busse, Matthias | Abstract: | Solid state lithium batteries are considered an alternative to currently available lithium ion batteries. The development of a suitable electrolyte is essential for commercialisation of bulk-type solid state batteries. This thesis is concerned with the synthesis of a solid state electrolyte as a composite of ceramic Li7La3Zr2O12 (LLZO) and a polymer electrolyte based on poly(ethylene oxide) (PEO). First, the synthesis of Al substituted LLZO by means of co-precipitation is described. The obtained powder is characterised with regard to its structural, chemical and electrochemical properties. In the second part, free-standing and flexible composite membranes (containing up to 40 vol% LLZO in polymer electrolyte (PEO20LiClO4) matrix) are manufactured by tape casting. In the third part, the LLZO/PEO20LiClO4 interface is identified as obstructive to continuous Li ion conduction. A model system is developed and investigated by means of impedance spectroscopy. |
Keywords: | Li7La3Zr2O12; PEO; co-precipitation; wet chemistry synthesis; impedance spectroscopy; ionic conductivity; interface | Issue Date: | 17-Oct-2017 | Type: | Dissertation | Secondary publication: | no | URN: | urn:nbn:de:gbv:46-00106390-17 | Institution: | Universität Bremen | Faculty: | Fachbereich 04: Produktionstechnik, Maschinenbau & Verfahrenstechnik (FB 04) |
Appears in Collections: | Dissertationen |
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