In situ 4d distribution visualization of carbon black volume fraction in cathode slurry of lithium-ion battery by multi-layered electrical resistance tomography (mlERT)
In situ 4D (3D spatial + 1D temporal) distribution of carbon black (CB) volume fraction /CB in cathode slurry of lithium-ion battery (LIB) (CB powder and lithium cobalt dioxide (LiCoO2) particles in NMP/PVDF solution) has been visualized by multi-layered electrical resistance tomography (mlERT). The mlERT are composed of 24 electrodes (=8 electrodes/layer x 3 layers) with a newly developed multiplexer unit, which reconstructs the normalized conductivity r from the measured voltages U. The conditions of CB is observed in the three dispersion states which are initial state, dispersing state, and fully dispersed state, under the mixing time t = 0 - 360 s and the mixing speed w = 720; 400; and 200rpm. As the results, in the initial state (t = 0s), the distribution of /CB is clearly visualized by the spatial r distribution from the high conductivity of CB volume fraction to the low conductivity of Li volume fraction which represents the initial position of CB powder and LiCoO2 particles in NMP/PVDF solution. In the dispersing state (t = 30 - 120 s), the distribution of CB volume fraction is dynamically changed as the r distribution is graduallly increased in the 3D spatial domain of mlERT which represents the dispersing CB powder within LiCoO2 particles in NMP/PVDF solution. In the fully dispersed state (t = 120 - 360 s), the CB volume fraction is in the uniformity as the r distribution tends to be uniformly dispersed which represents the fully dispersed CB in cathode slurry. In order to evaluate the distribution visualization of CB volume fraction in the fully dispersed state by mlERT, a qualitatively-scanning electron microscope (SEM) and a quantitatively-invasive two-wire resistance measurement are tested. The qualitatively-SEM images of fully dispersed CB at the height z = 5 and 20mm are observed in the distributed formation of CB powder within LiCoO2 particles in NMP/PVDF solution which agrees to the uniformity of the r distribution by mlERT. Moreover, the comparison of r distribution by mlERT to the quantitatively-invasive two-wire resistance measurement is resulted in a low root means square error RSME = 0:00196% which indicates the high accuracy of the in situ 4D distribution visualization of CB volume fraction in cathode slurry of LIB by mlERT.
Rumpun Ilmu
Teknik Mesin (dan Ilmu Permesinan Lain)
Bahasa Asli/Original Language
English
Level
Internasional
Status
Dokumen Karya
No
Judul
Tipe Dokumen
Aksi
1
Artikel APT 2.pdf
[PAK] Full Dokumen
2
In situ 4D distribution visualization of carbon-black volume fraction in cathode slurry of lithium-ion battery by multi-layered electrical resistance tomography (mlERT) (1).pdf
[PAK] Cek Similarity
3
6_ Bukti Korespondensi sesuai DIKTI_YAKP_APT 2_RZ.pdf
