Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Fabrication of a Porous Copper Current Collector Using a Facile Chemical Etching to Alleviate Degradation of a Silicon-Dominant Li-ion Battery Anode

  • Choi, Hongsuk (School of Materials Science & Engineering, Gwangju Institute of Science and Technology (GIST)) ;
  • Kim, Subin (School of Materials Science & Engineering, Gwangju Institute of Science and Technology (GIST)) ;
  • Song, Hayong (School of Materials Science & Engineering, Gwangju Institute of Science and Technology (GIST)) ;
  • Suh, Seokho (Graduate School of Energy Convergence, Gwangju Institute of Science and Technology (GIST)) ;
  • Kim, Hyeong-Jin (Graduate School of Energy Convergence, Gwangju Institute of Science and Technology (GIST)) ;
  • Eom, KwangSup (School of Materials Science & Engineering, Gwangju Institute of Science and Technology (GIST))
  • Received : 2021.07.28
  • Accepted : 2021.10.13
  • Published : 2021.10.31
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Abstract

In this work, we proposed a facile method to fabricate the three-dimensional porous copper current collector (3D Cu CC) for a Si-dominant anode in a Li-ion battery (LiB). The 3D Cu CC was prepared by combining chemical etching and thermal reduction from a planar copper foil. It had a porous layer employing micro-sized Cu balls with a large surface area. In particular, it had strengthened attachment of Si-dominant active material on the CC compared to a planar 2D copper foil. Moreover, the increased contact area between a Si-dominant active material and the 3D Cu could minimize contact loss of active materials from a CC. As a result of a battery test, Si-dominant active materials on 3D Cu showed higher cyclic performance and rate-capability than those on a conventional planar copper foil. Specifically, the Si electrode employing 3D Cu exhibited an areal capacity of 0.9 mAh cm-2 at the 300th cycles (@ 1.0 mA cm-2), which was 5.6 times higher than that on the 2D copper foil (0.16 mAh cm-2).

Keywords

Acknowledgement

This work was supported by GIST Research Institute (GRI) grant funded by Gwangju Institute of Science and Technology (GIST) in 2021.

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