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DS: Fachverband Dünne Schichten

DS 22: Interfaces and Thin Films III (joint session with CPP)

DS 22.12: Vortrag

Mittwoch, 18. März 2015, 12:30–12:45, C 243

Improved Electrolyte-Additive Induced Performance of Graphite Anodes for Lithium-Ion Batteries – Electrochemical and Electrode Surface Studies — •Anna Dimitrova¹, Andre Müller², Svetlozar Ivanov², Marcel Himmerlich¹, Anja Eisenhardt¹, Andreas Bund², and Stefan Krischok¹ — ¹Technische Universität Ilmenau, Institut für Physik and Institut für Mikro- und Nanotechnologien, Germany — ²Technische Universität Ilmenau, Fachgebiet Elektrochemie und Galvanotechnik, Germany

The electrolyte decomposition is a crucial stage in the formation cycle of Li–ion batteries. It results in the formation of a protective passivation layer on the graphite electrode surface, called solid electrolyte interphase (SEI). SEI formation competes with Li ion incretion and its chemical composition and structure determines the battery cell life time. To control this process we designed a phosphorous enriched electrolyte, which enhances the rate performance and the capacity retention of the Li–ion battery compared to a non-modified electrolyte. In order to study charge-discharge cycles in the batteries and to analyze the SEI composition, we combined electrochemical studies with X-ray Photoelectron Spectroscopy (XPS). In this work the influence of the electrolyte on the SEI composition was investigated and a correlation between chemical structure and electrochemical characteristics of the Li–ion battery will be discussed.