Journal
JOURNAL OF POWER SOURCES
Volume 340, Issue -, Pages 1-5Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2016.11.051
Keywords
Lithium-ion battery; Binder migration; Graphite anode; EDS analysis
Funding
- Federal Ministry of Economics and Technology
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Energy dispersive x-ray spectroscopy (EDS) is evaluated regarding its applicability for revealing the binder distribution in lithium-ion battery electrode films. Graphite anodes comprising carbon black and PVDF binder are subject to varying drying conditions during solvent removal in order to adjust different binder distributions; fluorine is used as a marker for the presence of PVDF. For electrodes of about 70 gm thickness the fluorine concentration is detected at the surface of the electrode film as well as at the interface between electrode film and current collector foil. It is clearly visible by EDS that increasing drying temperatures (and drying rates) result in an accumulation of binder at the surface and a corresponding depletion at the interface. It is demonstrated on the basis of ion-milled cross-sections of thick electrodes (ca. 400 mu m) that a quantitative mapping of the binder distribution delivers additional information about concentration gradients in dependence of the drying parameters. (C) 2016 Elsevier B.V. All rights reserved.
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