Styrene-Butadiene Rubber Patterned Current Collector for Enhanced Li-Ion Kinetics for High Energy Density Li-Ion Batteries

During the drying process, the migration of the styrene-butadiene rubber (SBR) binder, driven by capillary forces, can lead to a concentration gradient in the anode. This gradient adversely affects the adhesion strength at the interface between the anode film and the Cu current collector, as well as the Li-ion kinetics. In this study, we propose a solution to this issue through the use of a Cu current collector patterned with SBR. The pre-patterned SBR demonstrates strong adhesion to the Cu current collector, effectively preventing migration during the drying process. A uniform distribution of SBR along the longitudinal direction of the anode enhances both adhesion strength and Li-ion kinetics. Improved adhesion strength also allows for a reduction in SBR content in the anode, further enhancing Li-ion kinetics. Anodes utilizing this patterned SBR on Cu exhibit enhanced constant current charging capacity retention and improved cycling stability compared to those with a pristine Cu current collector.