Targeting new ways for large-scale,high-speed surface functionalization using direct laser interference patterning in a roll-to-roll process  

作　　者：Christoph Zwahr Nicolas Serey Lukas Nitschke Christian Bischoff Ulrich Radel Alexandra Meyer Penghui Zhu Wilhelm Pfleging 

机构地区：[1]Laser Precision Manufacturing,Fraunhofer Institute for Material and Beam Technology(IWS),Dresden,Germany [2]Topag Lasertechnik GmbH,Darmstadt,Germany [3]Institute of Manufacturing Science and Engineering,Technical University Dresden,Dresden,Germany [4]Institute for Applied Materials—Applied Materials Physics(IAM-AWP),Karlsruhe Institute of Technology(KIT),Eggenstein-Leopoldshafen,Germany

出　　处：《International Journal of Extreme Manufacturing》2023年第3期569-583,共15页极端制造(英文)

基　　金：funded by the German Federal Ministry of Education and Research(BMBF),project NextGen-3DBat,Grant Number 03XP0198F;by the Fraunhofer Cluster of Excellence Advanced Photon Sources(CAPS)。

摘　　要：Direct Laser Interference Patterning(DLIP)is used to texture current collector foils in a roll-to-roll process using a high-power picosecond pulsed laser system operating at either fundamental wavelength of 1064 nm or 2nd harmonic of 532 nm.The raw beam having a diameter of 3 mm@1/e^(2) is shaped into an elongated top-hat intensity profile using a diffractive so-called FBS■-L element and cylindrical telescopes.The shaped beam is split into its diffraction orders,where the two first orders are parallelized and guided into a galvanometer scanner.The deflected beams inside the scan head are recombined with an F-theta objective on the working position generating the interference pattern.The DLIP spot has a line-like interference pattern with about 15μm spatial period.Laser fluences of up to 8 J cm^(-2) were achieved using a maximum pulse energy of 0.6 mJ.Furthermore,an in-house built roll-to-roll machine was developed.Using this setup,aluminum and copper foil of 20μm and 9μm thickness,respectively,could be processed.Subsequently to current collector structuring coating of composite electrode material took place.In case of lithium nickel manganese cobalt oxide(NMC 622)cathode deposited onto textured aluminum current collector,an increased specific discharge capacity could be achieved at a C-rate of 1℃.For the silicon/graphite anode material deposited onto textured copper current collector,an improved rate capability at all C-rates between C/10 and 5℃ was achieved.The rate capability was increased up to 100%compared to reference material.At C-rates between C/2 and 2℃,the specific discharge capacity was increased to 200 mAh g^(-1),while the reference electrodes with untextured current collector foils provided a specific discharge capacity of 100 m Ah g^(-1),showing the potential of the DLIP technology for cost-effective production of battery cells with increased cycle lifetime.

关 键 词：DLIP lithium-ion battery surface texturing copper aluminum 

分 类 号：U469.72[机械工程—车辆工程] TM912[交通运输工程—载运工具运用工程]