Eigenschaften rußbasierter Schwefel-Kathoden in Abhängigkeit der Herstellungsprozesse
Produktform: Buch / Einband - flex.(Paperback)
With the continuous development of high-performance materials for rechargeable
batteries and the growing demand for battery cells in various applications, the
processing of the materials into battery electrodes has become a key issue. Only
the correct design and application of the process engineering operations makes it
possible to push the materials to their performance limits.
At the same time, the properties of the materials directly determine their usability
with certain process routes. In this thesis, the extent to which the properties of
the cathodes can be changed by adjusting the parameters of different processes is
investigated using the example of carbon black based sulfur cathodes for lithium
sulfur batteries. The main focus is on the comparison of dissolver and extruder as
representatives for batch and continuous dispersion in order to test their suitability
for the carbon black-sulfur material system. For this purpose, a product-effective
specific power is calculated on the basis of the dispersion effect, which enables the
comparison of the very different processes.
The evaluation of the process parameter variation is carried out on the basis of
the suspension and electrode properties as well as their performance. In addition
to dispersion, the loading and compression of carbon black based sulfur cathodes is
also investigated. In order to classify the properties of the cathodes, aqueous binder
systems and carbons with higher specific surface areas are compared and processed
into sulfur cathodes. Here, the influence on the processability is particularly relevant,
which in turn requires new process strategies.
Finally, composite particles are produced by a high-intensity mixing process in a
ring shear mixer and the correlation of the properties with the process parameters is
investigated. For a transfer to other mechanical processes a specific stressing energy
is established and estimated. The properties of the electrodes resulting from the
composites are analyzed exemplarily and evaluated in the context of the results
obtained so far.
Thus, this work spans a wide range over the entire process chain of electrode production
for lithium sulfur batteries and considers central processing steps with regard to
their mechanisms of operation. By estimating the stressing intensities, comparisons
to other process routes and correlations of the properties of intermediate as well as
end products with these parameters are enabled.weiterlesen
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