Effect of Coagulation Bath Composition on Cellulose-Based Polymer Electrolyte Fabricated via Non-Solvent-Induced Phase Separation Method
Cellulose acetate (CA) membrane was developed through a non-solvent-induced phase separation (NIPS) technique to replace the commercial petroleum-based Celgard separator membrane in Li-ion battery (LIB). The morphology of a membrane can have a substantial impact on both its mechanical and electr...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Universitas Indonesia
2023-12-01
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| Series: | International Journal of Technology |
| Subjects: | |
| Online Access: | https://ijtech.eng.ui.ac.id/article/view/6677 |
| Summary: | Cellulose acetate (CA) membrane was developed through
a non-solvent-induced phase separation (NIPS) technique to replace the
commercial petroleum-based Celgard separator membrane in Li-ion battery (LIB).
The morphology of a membrane can have a substantial impact on both its
mechanical and electrochemical properties, which are influenced by the
solvent-nonsolvent interaction. Therefore, this study examined the effect of
solvent fraction in an acetone-water system on the membrane morphology. CA
dissolved in acetone was cast on a glass plate and immersed in the coagulation
bath with varying acetone-water ratios. The resulting free-standing membrane
was analyzed subsequently and showed increased porosity, hydrophilicity, and
electrolyte uptake with higher acetone ratios in the coagulation bath. It was
also found that a more porous membrane contributes to a lower tensile strength,
including, 6.8 MPa, 5.5 MPa, 4.6 MPa, and 2.6 MPa for the coagulation baths
containing 0%, 25%, 50%, and 75% acetone, respectively. These results showed
that the mechanical properties of CA membranes are higher than those of
commercial Celgard membranes (1.42 MPa). LIB separator performance was measured
using electrochemical impedance spectroscopy (EIS). CA membrane fabricated with
50% acetone content in the coagulation bath possessed the highest ionic
conductivity, 4.79×10-4 S/cm, which is higher than the ionic
conductivity of the Celgard membrane (9.41×10-7 S/cm). Considering
their superior mechanical properties and electrical performance, CA membranes
could potentially substitute Celgard as a more sustainable alternative for LIB
separators. |
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| ISSN: | 2086-9614 2087-2100 |