Einfluss von Stromstärke und Zyklentiefe auf graphitische Anoden

• Influence of current density and cycle depth on graphitic anodes

Münnix, Jens; Sauer, Dirk Uwe (Thesis advisor); Jossen, Andreas (Thesis advisor)

Aachen : ISEA (2017)
Book, Dissertation / PhD Thesis

In: Aachener Beiträge des ISEA 91
Page(s)/Article-Nr.: 1 Online-Ressource (iv, 171 Seiten) : Illustrationen, Diagramme

Dissertation, Rheinisch-Westfälische Technische Hochschule Aachen, 2017

Abstract

At ageing tests with commercial Lithium-Ion Batteries unexpected strong degradation can be observed at certain test settings. At some of those conditions the anode, which is graphite based, has a phase change which can be the root cause for the ageing. The phase change causes a volume change in the materials. For the analysis in this work commercially available cells with different chemistries are investigated. The cells differ in design and capacity were systematically and accelerated aged, before they were disassembled and analysed for ageing effects. Goal of the work is to clarify whether there is a stronger degradation of the graphitic anode due to current density and cycle depth. The results show no structural change of the activ material, but an effect at the border between anode and electrolyte, which limit the power and lifetime of the cell.