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@ARTICLE{Bitsch:829002,
author = {Bitsch, Boris and Gallasch, Tobias and Schroeder, Melanie
and Börner, Markus and Winter, Martin and Willenbacher,
Norbert},
title = {{C}apillary suspensions as beneficial formulation concept
for high energy density {L}i-ion battery electrodes},
journal = {Journal of power sources},
volume = {328},
issn = {0378-7753},
address = {New York, NY [u.a.]},
publisher = {Elsevier},
reportid = {FZJ-2017-02819},
pages = {114 - 123},
year = {2016},
abstract = {We introduce a novel formulation concept to prepare high
capacity graphite electrodes for lithium ion batteries. The
concept is based on the capillary suspension phenomenon:
graphite and conductive agent are dispersed in an aqueous
binder solution and the organic solvent octanol is added as
immiscible, secondary fluid providing the formation of a
sample-spanning network resulting in unique stability and
coating properties. No additional processing steps compared
to conventional slurry preparation are required. The
resulting ultra-thick electrodes comprise mass loadings of
about 16.5 mg cm−2, uniform layer thickness, and superior
edge contours. The adjustment of mechanical energy input
ensures uniform distribution of the conductive agent and
sufficient electronic conductivity of the final dry
composite electrode. The resulting pore structure is due to
the stable network provided by the secondary fluid which
evaporates residue-free during drying. Constant
current-constant potential (CC-CP) cycling clearly indicates
that the corresponding microstructure significantly improves
the kinetics of reversible Li+ (de-) intercalation. A double
layer electrode combining a conventionally prepared layer
coated directly onto the Cu current collector with an upper
layer stabilized with octanol was prepared applying
wet-on-wet coating. CC-CP cycling data confirms that staged
porosity within the electrode cross section results in
superior electrochemical performance.},
cin = {IEK-12},
ddc = {620},
cid = {I:(DE-Juel1)IEK-12-20141217},
pnm = {131 - Electrochemical Storage (POF3-131)},
pid = {G:(DE-HGF)POF3-131},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000383293400013},
doi = {10.1016/j.jpowsour.2016.07.102},
url = {https://juser.fz-juelich.de/record/829002},
}