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

In Chul Kim, Dong Jin Byun, Joong Kee Lee

Research output: Contribution to journalArticle

14 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)661-665
Number of pages5
JournalJournal of Electroceramics
Volume17
Issue number2-4
DOIs
Publication statusPublished - 2006 Dec 1

Keywords

  • Anode
  • Lithium ion battery
  • Metal-silicide
  • PECVD

ASJC Scopus subject areas

  • Ceramics and Composites

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