Dresden 2017 – scientific programme

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SYLI: Symposium Interfacial Challenges in Solid-State Li Ion Batteries

SYLI 5: Structure - property relationships I

SYLI 5.2: Talk

Tuesday, March 21, 2017, 12:00–12:15, IFW A

Comparison of different thin-film solid-state battery systems — •Susann Nowak, Juliane Mürter, and Guido Schmitz — Heisenbergstr. 3, 70563 Stuttgart

Different systems of thin-film batteries will be compared in respect to their suitability of being used as a reasonable combination of materials in an all-solid-state battery. As the cathode lithium iron phosphate, lithium cobalt oxide and lithium manganese oxide are compared. The used electrolyte is LiPON and as the anodes tin, silicon and lithium are tested. All cells are prepared by ion-beam sputtering resulting in an overall thickness of one micrometer or less for the whole cell. Electrochemical and TEM investigations are used to evaluate the changes at the interfaces and in the electrodes during cycling and to show mechanisms of capacity loss in the system. The behavior of lithium iron phosphate is very different from the one of lithium cobalt oxide when covered with LiPON. The capacity of the LFP covered with LiPON is exponentially increasing with the temperature and reaching its theoretical value at around 70°C. In the case of all-solid-state batteries with other anodes than lithium, the capacity becomes dependent on the chosen balancing ratio of the cells.