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Appl. Sci. 2017, 7(9), 914; doi:10.3390/app7090914

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

1
Department of Mechanical and Automotive Engineering, Kongju National University, Cheonan 31080, Korea
2
Department of Laser and Electron Beam Application, Korean Institute of Machinery & Materials (KIMM), Daejeon 34103, Korea
*
Author to whom correspondence should be addressed.
Received: 25 July 2017 / Revised: 30 August 2017 / Accepted: 31 August 2017 / Published: 6 September 2017
(This article belongs to the Special Issue Electrode Materials for Lithium-ion Batteries/Super-capacitors)
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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. View Full-Text
Keywords: laser cutting; lithium-ion batteries; LiCoO2; aluminum; laser cutting width; physical characteristics laser cutting; lithium-ion batteries; LiCoO2; aluminum; laser cutting width; physical characteristics
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Lee, D.; Ahn, S. Investigation of Laser Cutting Width of LiCoO2 Coated Aluminum for Lithium-Ion Batteries. Appl. Sci. 2017, 7, 914.

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