Characterization of batteries materials ablation by femtosecond pulses

Abstract

The implementation of femtosecond laser processing in batteries fabrication is of high interest for automotive industry. The laser ablation mechanisms of composite materials used for batteries is a key knowledge for the laser processing optimization. In this work, we provide new results on fs ablation efficiencies for materials used in lithium-ion batteries. A very high value is obtained for specific ablation rates of graphite, up to 12 mm3/min/W, while the value is next to 0.2 mm3/min/W for the metallic substrate. The results show less benefit for MHz and GHz bursts of pulses in the case of graphite. Nevertheless because of the huge ablation efficiency difference between the active material and the metallic substrate, electrode cutting time is dominated by the metallic substrate cutting for which a significant benefit of GHz bursts is evidenced.