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Electrochemical characteristics of silicon-metals coated graphites for anode materials of lithium secondary batteries

  • 2. Energy: Fuel cells, batteries etc.
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Abstract

Four kinds of silicon-metals (Cu, Ni, Sn)-graphite composites for anode active materials of lithium secondary batteries were prepared by sequential employment of PECVD (Plasma enhance chemical vapor deposition) and RF(Radio-frequency)-magnetron sputtering method. The silicon-copper-graphite composite showed the highest reversible capacity and cyclability among the silicon-metal composite graphite samples prepared. The enhanced electrochemical performance of silicon-copper-graphite composite is attributed to the formation of copper silicide on the surface of graphite.

The copper silicide plays an important role as a buffering layer against volume change of silicon during the intercalation/deintercalation due to the chemical bonding of silicon and copper, and has lower interfacial impedance than that of other silicon-metal-graphite composites which may lead to low irreversible capacity.

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Authors and Affiliations

  1. Department of Material Science and Engineering, Korea University, Seoul, 136-713, Korea

    In-Chul Kim & Dongjin Byun

  2. Advanced Energy Materials Processing Laboratory, Battery Research Center, Korea Institute of Science and Technology, P.O BOX 131, Cheongryang, Seoul, 130-650, Korea

    Joong Kee Lee

Authors
  1. In-Chul Kim
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  2. Dongjin Byun
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  3. Joong Kee Lee
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Correspondence to Joong Kee Lee.

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Kim, IC., Byun, D. & Lee, J.K. Electrochemical characteristics of silicon-metals coated graphites for anode materials of lithium secondary batteries. J Electroceram 17, 661–665 (2006). https://doi.org/10.1007/s10832-006-0386-z

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  • DOI: https://doi.org/10.1007/s10832-006-0386-z

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