Journal
JOURNAL OF POWER SOURCES
Volume 363, Issue -, Pages 460-469Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2017.07.102
Keywords
Carbon electrodes; Binder; Carbon black distribution; SEM; Energy selective backscatter detector (ESB)
Funding
- Federal Ministry of Economics and Technology on the basis of a decision by the German Bundestag within the BMBF grant [03ET6017]
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In the current work, graphite electrodes comprising PVDF binder and carbon black are subjected to characterization. An energy selective backscatter detector is used to localize carbon black and fluorine of PVDF. Therefore, it is necessary to distinguish between graphite, amorphous carbon and fluorine rich regions. Typically, an angular selective backscatter detector is employed to obtain an image providing the material contrast of the sample. Suitable materials for that detector are e.g. alloys to observe intermetallic phases, semiconductor for channeling contrast, or imaging SiO2 and Au nanoparticles in biological cells. However, this detector cannot be used to distinguish between light elements with low atomic numbers, such as C to P. In addition, the contrast of fluorine rich regions and graphite is poor in normal in-lens images due to the low difference of the atomic mass between C and F. The aim of this study is to enhance the contrast of fluorine rich regions to graphite to carbon black. Therefore, the energy selective backscatter detector is used and its advantages and setup is described. Finally this technique is applied to investigate 400 pm thick cross-sections of graphite electrodes dried at different temperatures and obtain the carbon black distribution. (C) 2017 Elsevier B.V. All rights reserved.
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