Investigation of Laser Cutting Width of LiCoO2 Coated Aluminum for Lithium-Ion Batteries

Abstract

Lithium-ion batteries are widely used for many applications such as portable electronic devices and Electric Vehicles, because they have lighter weight, higher energy density, higher power density, and a higher energy-to-weight ratio than other types of batteries. Conventional contact-based cutting technology may be inefficient whenever cell design is changed since lithium-ion battery cells are not standardized. Furthermore, the conventional cutting may result in process instability and a poor cut quality due to the tool wear so that it leads to short circuits and local heat generation. These process instability and inefficiency may be solved by laser cutting due to advantages such as clean cutting edge, less deformation, applicability to almost all materials, possibility of precision processing, and easy modification of cutting path. Despite the importance of the laser cutting research, no clear definition of cutting widths has been presented, and there is lack of knowledge to understand the effect of laser parameters on cutting widths. Therefore, this research examines the surface of cathode cut by a laser and defines cutting widths such as top width, melting width, and kerf width. The relationship between the laser parameters and cutting characteristics with defined widths are studied. When the volume energy is less than 6.0172 × 10 10 J/m 3 , no active electrode material is removed. When the laser power is greater or equal to 100 W, both the top and melting widths are clearly observed. The laser power of 50 W can selectively ablate the active electrode material with the material removal rate of 32.14-55.71 mm 3 /min. The threshold volume energy to fully penetrate the 50 µm-thick current collector is between 9.6275 × 10 10 -8.0229 × 10 10 J/m 3 . All clearance width is less than 20 µm, while the clearance width interestingly exceeds 20 µm when the laser power is 200 W. The effect of material properties on heat transfer using the one dimensional transient semi-infinite conduction model is investigated. In addition, five types of physical characteristics are defined and discussed.

Environmentally Friendly and Cost-Effective Synthesis of Carbonaceous Particles for Preparing Hollow SnO2 Nanospheres and their Bifunctional Li-Storage and Gas-Sensing Properties

“…After cycling for 200 times, the capacity remains exceeding 500 mAh g −1 , along with a high Coulombic efficiency of about 99%, indicating a good reversibility. This is ascribed to the hollow structure which enables the volume-change to be accommodated [35,36]. charge or discharge of theoretical capacity of 782 mAh g in 1 h), the SnO2 anode exhibits a high first-cycle capacity of about 1200 mAh g −1 , which is ascribed to the formation of an unstable solid electrolyte interphase (SEI) [33,34].…”

“…After cycling for 200 times, the capacity remains exceeding 500 mAh g −1 , along with a high Coulombic efficiency of about 99%, indicating a good reversibility. This is ascribed to the hollow structure which enables the volume-change to be accommodated [35,36]. Figure 6 displays the gas-sensing responses of the sensor towards ethanol gases.…”

Investigation of Physical Phenomena and Cutting Efficiency for Laser Cutting on Anode for Li-Ion Batteries

“…The experimental setup can be found in Lee et al [25]. A single-mode Quasi-Continuous Ytterbium Fiber laser (IPG YLM-200/2000-QCW) was used in a continuous mode with a wavelength of 1070 nm.…”

Experimental Investigation of Laser Ablation Characteristics on Nickel-Coated Beryllium Copper

“…Due to these advantages, laser material processing is actively studied for a variety of cutting and drilling processes [1,[8][9][10][11][12][13][14][15][16][17][18][19][20]. Conventional laser cutting and drilling processes can be modified to the laser spot cutting to efficiently remove the connecting arms [1].…”