ac303187r_si_001.pdf (448.06 kB)
Correlation between Internal Structure and Electrochemical Impedance Spectroscopy of Multiphase Slurry Systems
journal contribution
posted on 2013-04-16, 00:00 authored by Seoung Jai Bai, Young Seok SongSlurry
for lithium-ion batteries is prepared from an active material, a carbon
conductive additive, and a polymeric binder in a solvent, and its
morphological change is evaluated over time using electrochemical
impedance spectroscopy. A schematic model of the internal structure
and dispersion states of the slurry components during 7 days of storage
is proposed on the basis of the electrochemical impedance spectroscopy
(EIS) measurement. The EIS results reveal that the conductive path
constructed by the network structure of the slurry components breaks
over time, which can be worsened by mechanical agitation. In order
to confirm the morphological change, the slurry is freeze-dried and
then prepared to fixate the locations of the slurry components. The
existence of a network structure (or flocculation) is verified by
morphological observations. In addition, the dispersity index and
Micro-CT are introduced as new methods representing the dispersion
state of the slurry components.