Physical and electrochemical properties of LiFePO4/carbon composite synthesized at various pyrolysis periods

Kuei Feng Hsu, Sun Yuan Tsay, Bing Joe Hwang

Research output: Contribution to journalArticlepeer-review

54 Citations (Scopus)

Abstract

Aluminum-doped lithium iron phosphate was synthesized with a modified sol-gel process. The sol-gel derived cathodes show much higher conductivity than those prepared by a solid-state method. The conductivity is 8 × 10 -2 S cm-1 for the Al-doped LiFePO4/carbon composite powders synthesized at 850 °C for 2 h, as determined using AC impedance spectroscopy. The electrodes consisting of the Al-doped LiFePO 4/carbon composite powders were fabricated for the electrochemical characterization and showed a specific capacity of about 150 mAh g-1 at C/40 rate. Not only the conductivity of the crystal lattice but also the conductivity of the grain boundary is enhanced for the nano-sized Al-doped LiFePO4/carbon composite powders.

Original languageEnglish
Pages (from-to)529-533
Number of pages5
JournalJournal of Power Sources
Volume146
Issue number1-2
DOIs
Publication statusPublished - 2005 Aug 26

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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