Journal of Electrochemical Science and Technology

The Korean Electrochemical Society (한국전기화학회)
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SnO2-Coated 3D Etched Cu Foam for Lithium-ion Battery Anode

  • Um, Ji Hyun (Department of Energy Science, Sungkyunkwan University) ;
  • Kim, Hyunwoo (Department of Energy Science, Sungkyunkwan University) ;
  • Cho, Yong-Hun (Division of Energy Engineering, Kangwon National University) ;
  • Yoon, Won-Sub (Department of Energy Science, Sungkyunkwan University)
  • Received : 2019.08.06
  • Accepted : 2019.11.07
  • Published : 2020.02.28
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Abstract

SnO2-based high-capacity anode materials are attractive candidate for the next-generation high-performance lithium-ion batteries since the theoretical capacity of SnO2 can be ideally extended from 781 to 1494 mAh g-1. Here 3D etched Cu foam is applied as a current collector for electron path and simultaneously a substrate for the SnO2 coating, for developing an integrated electrode structure. We fabricate the 3D etched Cu foam through an auto-catalytic electroless plating method, and then coat the SnO2 onto the self-supporting substrate through a simple sol-gel method. The catalytic dissolution of Cu metal makes secondary pores of both several micrometers and several tens of micrometers at the surface of Cu foam strut, besides main channel-like interconnected pores. Especially, the additional surface pores on etched Cu foam are intended for penetrating the individual strut of Cu foam, and thereby increasing the surface area for SnO2 coating by using even the internal of Cu foam. The increased areal capacity with high structural integrity upon cycling is demonstrated in the SnO2-coated 3D etched Cu foam. This study not only prepares the etched Cu foam using the spontaneous chemical reactions but also demonstrates the potential for electroless plating method about surface modification on various metal substrates.

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