Direct laser interference patterning and ultrafast laser-induced micro/nano structuring of current collectors for lithium-ion batteries

Abstract

Laser-assisted modification of metals, polymers or ceramics yields a precise adjustment of wettability, biocompatibility or tribological properties for a broad range of applications. Due to a specific change of surface topography on micro- and nanometer scale, new functional properties can be achieved. A rather new scientific and technical approach is the laserassisted surface modification and structuring of metallic current collector foils for lithium-ion batteries. Prior to the thick film electrode coating processes, the formation of micro/nano-scaled surface topographies on current collectors can offer better interface adhesion, mechanical anchoring, electrical contact and reduced mechanical stress during cycling. These features in turn impact on the battery performance and the battery life-time. In order to generate the 3D surface architectures on metallic current collectors, two advanced laser processing structuring technologies: direct laser interference patterning (DLIP) and ultrafast laser-induced periodic surface structuring (LIPSS) were applied in this study. After laser structuring via DLIP and LIPSS, composite electrode materials were deposited by tape-casting on the modified current collectors. The electrode film adhesion was characterized by tensile strength measurements. The impact of various surface structures on the improvement of adhesive strength was discussed

Laser structured Cu foil for high-performance lithium-ion battery anodes

“…Fig. 2e where their root mean square roughness (RMS) is around 180 nm and the depth of the nano-pore structure can reach 500 nm [15], and an increased Cu foil surface is generated. The uniformity and controllability of the laser ablation technique is confirmed in Fig.…”

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

“…This can be a reason for the electrochemical deterioration of the electrode. The causality between higher surface roughness, increased surface area, and peel strength was demonstrated in different studies using laser and non-laser based approaches [7][8][9]. Romoli et al [7] achieved a 30% higher peel strength using a direct laser writing (DLW) approach on copper utilizing a picosecond pulsed laser source.…”

“…Romoli et al [7] achieved a 30% higher peel strength using a direct laser writing (DLW) approach on copper utilizing a picosecond pulsed laser source. Zheng et al [8] achieved 78% higher tensile strength of a graphite film on an aluminum substrate by using direct laser interference patterning (DLIP) and a picosecond pulsed laser source.…”

Laser-assisted growth of hierarchically architectured 2D MoS2 crystals on metal substrate for potential energy applications

“…This has directly influenced the electrochemical properties and greatly enhanced battery performance, including battery lifetime, high-rate capability, and cycle stability. One of the critical issues for thick film and high energy electrodes is improving the electrode film adhesion, which can be possible by laser structuring [61][62][63]. Hence, a new battery concept has been introduced by the direct laser structuring of electrodes for achieving large-area energy capacities and power densities [64][65][66][67].…”