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http://dx.doi.org/10.5229/JKES.2019.22.1.36

Macroporous Thick Tin Foil Negative Electrode via Chemical Etching for Lithium-ion Batteries  

Kim, Hae Been (Graduate School of Knowledge-Based Technology and Energy, Korea Polytechnic University)
Lee, Pyung Woo (Department of Chemical Engineering and Biotechnology, Korea Polytechnic University)
Lee, Dong Geun (Department of Chemical Engineering and Biotechnology, Korea Polytechnic University)
Oh, Ji Seon (Department of Chemical Engineering and Biotechnology, Korea Polytechnic University)
Ryu, Ji Heon (Graduate School of Knowledge-Based Technology and Energy, Korea Polytechnic University)
Publication Information
Journal of the Korean Electrochemical Society / v.22, no.1, 2019 , pp. 36-42 More about this Journal
Abstract
A macroporous Sn thick film as a high capacity negative electrode for a lithium ion secondary battery was prepared by using a chemical etching method using nitric acid for a Sn film having a thickness of $52{\mu}m$. The porous Sn thick film greatly reduced the over-voltage for the alloying reaction with lithium by the increased reaction area. At the same time. The porous structure of active Sn film plays a part in the buffer and reduces the damage by the volume change during cycles. Since the porous Sn thick film electrode does not require the use of the binder and the conductive carbon black, it has substantially larger energy density. As the concentration of nitric acid in etching solution increased, the degree of the etching increased. The etching of the Sn film effectively proceeded with nitric acid of 3 M concentration or more. The porous Sn film could not be recovered because the most of Sn was eluted within 60 seconds by the rapid etching rate in the 5 M nitric acid. In the case of etching with 4 M nitric acid for 60 seconds, the appropriate porous Sn film was formed with 48.9% of weight loss and 40.3% of thickness change during chemical acid etching process. As the degree of etching of Sn film increased, the electrochemical activity and the reversible capacity for the lithium storage of the Sn film electrode were increased. The highest reversible specific capacity of 650 mAh/g was achieved at the etching condition with 4 M nitric acid. The porous Sn film electrode showed better cycle performance than the conventional electrode using a Sn powder.
Keywords
Porous Sn Thick Film; Nitric Acid; Chemical Etching; Lithium-Ion Batteries;
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Times Cited By KSCI : 3  (Citation Analysis)
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