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Min-Young Kim et al. / J. Electrochem. Sci. Technol., 2021, 12(3), 330-338 335 Fig. 7. Microstructure of cross section of electrode-bipolar plate assembly with CNT-EVA film for VRBs. Fig. 8. Contact resistance of electrode-bipolar plate assembly by applying the different adhesive films. Fig. 9. Shear strength of electrode-bipolar plate with adhesive film: specimen status before test (a), and after test (b), the value of shear strength with samples. that despite a short thermal compression time, the non-woven EVA is sufficiently dissolved to a thick- ness of about 50 μm to maintain a wide adhesion sur- face. Currently, the electrodes of commercial VRBs are maintained at a compaction pressure of about 0.5 to 7 kgf cm-2. The contact resistance of the existing electrode-bipolar plate shows 350 mΩ.cm2 at 1 kgf cm-2, and about 100 mΩ.cm2 at 5.5 kgf cm-2, respec- tively [16]. Fig. 8 shows the contact resistance of bare EVA assembly, CB-EVA assembly, CNT-EVA assembly, and blank cell without EVA as compari- son: 175, 120, 75, and 139 mΩ.cm2 at 5.5 kgf cm-2, respectively, and tend to decrease with compaction pressure and finally it decrease to 80, 70, 50, and 74 mΩ.cm2 at 13 kgf cm-2. Comparing without EVA, contact resistance was decreased by introducing CAF such as CNT-EVA and CB-EVA. Herein, The CNT- EVA assembly sample showed the lowest value among the tested samples, and bare EVA assembly, which is not coated with a conductive material, showed the highest value. Thus, it seems that the con- tact resistance is dependent on the properties of the coating material on the non-woven EVA polymer. Although the EVA shape was non-woven type with large emty space as shown Fig. 5 (a), it was changed during compression under 0.5 MPa and 110oC as shown Fig. 7. Therefore, the contact resistance between the electrode and the bipolar plate variesPDF Image | Energy Efficiency Improvement of Vanadium Redox Flow Battery
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