Binder staining 2 (IMAGE)
Caption
Using binder staining and cross-sectional energy-dispersive X-ray spectroscopy (EDX) to optimize fast electrode drying. The top electrode was dried at high temperature of 120 oC, which caused part of styrene butadiene rubber (SBR) (here, marked green) and carboxymethyl cellulose (CMC) (not shown) binders to migrate to the top electrode surface, making the electrode coating easily delaminating from the Cu current collector (marked magenta). The middle electrode was briefly dipped in isopropanol before drying at 120 oC, which amplified binder concentration at the top, leaving the middle part of the electrode binder-lean and prone to significant cracking. The bottom electrode was briefly dipped in acetone prior to 120 oC drying. The acetone dip prevented binder migration, concentrating binders close to the Cu collector and leaving more porosity in the upper electrode region for more efficient ionic transport. As a result, the acetone-dipped electrode had excellent adhesion to the current collector, and had 40% lower pore ionic resistance compared to the top (not-dipped) electrode. Credit: Stanislaw Zankowski.
Credit
Stanislaw Zankowski.
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