A thin film and high roughness flexible current collector for high charging/discharging rate flexible Li-ion battery

In this work, a 5.6 um thick, Rq 637.98 um roughness flexible Parylene C current collector is developed by using a rough Si wafer as a template. The rough current collector achieves 31% capacity retention @ 8C charging and discharging rate comparing the capacity @ 0.2C, which is 2.1 times higher than the sample using a flat current collector.