Preparation of a good dispersion of micro-
or nano-scaled powders and highly viscous polymer solutions has always been a
problem for experimentalists. The uniformity of the dispersion, as assessed
from its rheological behaviour, is strongly dependent on the sequence of
mixing, solution preparation, mixing devices and operating conditions.
In lithium batteries, the electrodes are
made up of multi-component mixtures. The key component in the cathode is an
active material such as LiCoO2, LiNiO2, or a three-dimensional material such as
LiNiMnCoO2. The three-dimensional active material usually gives a better
battery performance and has been adopted in the production of lithium batteries
for the automobile industry.
Both electrodes are normally prepared in the
form of viscous slurries in order to facilitate the downstream coating
operation. A thorough mixing of the slurries is critical for the coating and
drying operations, which will eventually affect the performance and quality of
the batteries. Therefore, a proper selection of mixing devices and mixing
procedures for the electrode slurries is an essential first step towards the
production of good quality batteries.
In the present study, a new
three-dimensional mixing device was designed for electrode slurry mixing. The
performance of the mixing device was examined initially by a flow visualization
technique using clear solutions with a tracer. The effectiveness of mixing
anode and cathode materials was then examined rheologically through shear
viscosity and dynamic measurements. The resulting batteries fabricated from the
slurries obtained with different mixers and mixing schemes were tested for
their electrical performance.
Article by Tan Fan,et
al,from National Tsing Hua University, Taiwan.
Full access:http://mrw.so/4xAbNf
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