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Effects of doping on the electrical conductivity and particle size in olivine type LiFePO₄powders

  • Journal of the Korean Crystal Growth and Crystal Technology
  • Abbr : J. Korean Cryst. Growth Cryst. Technol.
  • 2008, 18(6), pp.248~252
  • Publisher : The Korea Association Of Crystal Growth, Inc.
  • Research Area : Engineering > Materials Science and Engineering

Chang-Sam Kim 1,  백진도 2,  Ha Jung Soo 2

1한국과학기술연구원
2안동대학교

Accredited

ABSTRACT

To get a fine LiFePO₄ powder with high electrical conductivity, the influences of doping of aliovalent elements (Cr + B and Cr + Al) on electrical conductivity and of heat treatment conditions on particle size of the doped powders were studied. Two kinds of the doped powders LiFe0.965Cr0.03B0.005PO4 and LiFe0.965Cr0.03Al0.005PO₄were synthesized using mechanochemical milling and subsequent heat treatment at 675~750oC for 5~10 h. The doping enhanced grain growth and electrical conductivity. The electrical conductivity at 30oC was 1 × 10−8S/cm in the doped with Cr and Al, and 5 × 10−10 S/cm in the undoped one.

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