Physico-Chemical and Electrochemical Properties of Si-Ti-Ni Alloy Modified with poly(3,4-ethylenedioxythiophene)

Hyoree Seo, Keon Kim, Cheol Woo Yi

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Si-Ti-Ni alloy (STN) is a promising active material for lithium ion batteries with high coulombic efficiency and stable cycleability since inactive matrix plays an important role in buffer action against large volume changes of Si during charge/discharge reactions. However, there still remain several challenges to apply to electric vehicles due to capacity fading and unstable cycle performances at high current density. In this study, to improve the properties of STN, we modified the surface of STN with poly(3,4-ethylenedioxythiophene) (PEDOT) by in-situ polymerization. The modified STN provides many advantages including stable cycleability, low charge transfer resistance, strong adhesion between active materials and active material and current collector, etc. Electrochemical performances are significantly improved after modification; especially under high current density conditions.

Original languageEnglish
Pages (from-to)247-254
Number of pages8
JournalElectrochimica Acta
Volume165
DOIs
Publication statusPublished - 2015 Feb 28

Keywords

  • Lithium battery
  • Si-Ti-Ni alloy poly(3,4-Ethylenedioxythiophene)
  • Surface modification

ASJC Scopus subject areas

  • Electrochemistry
  • Chemical Engineering(all)

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