Lithium iron phosphate battery electrode integrity following high speed pulsed laser cutting

Abstract

Laser exposures are performed on lithium iron phosphate battery electrodes at 1m/s with process parameters based on those leading to the smallest heat affected zone for low power laser exposure at 100mm/s. Scanning electron microscopy and Raman analysis are performed along the resulting cut edges to characterize macroscopic, chemical and microstructural changes resulting from laser exposure. The increase in velocity with respect to previous studies is found to limit macroscopic changes to areas directly exposed to the laser beam and greatly suppress or completely eliminate microstructural and chemical changes resulting from thermal conduction effects in the metallic conductor layers. These results confirm laser technology as a viable, more flexible solution to mechanical blanking devices for the cutting of lithium iron phosphate battery electrode films

Evaluation of the Separation Process for the Production of Electrode Sheets

“…In order to describe the influence of the parameters cutting speed, PRF and spot size on the ablation behavior, the pulse overlap resulting from the mentioned parameters can be used. High pulse overlaps lead to a homogeneous energy input and therefore to homogeneous cutting edge …”

“…Since the wavelength that can be generated is limited by the laser‐active media, in particular, the wavelengths 1070, 1064, 532, and 355 nm are the focus of previous investigations because these can be generated most efficiently …”

Three‐stage kinetics of laser‐induced LiFePO4 decomposition

“…In the same year, Markevich et al (2011) [10] studied laser-induced effects for C-coated LiFePO 4 and LiCoPO 4 in air and inert atmosphere (helium), again, for different values of laser power and accumulation time. Besides these four earliest papers, we can mention two works of Lutey et al, [11,12] studying chemical and structural transformations of LFP, following pulse laser exposure (used for laser cutting).…”