Electrochemical properties of the carbon-coated LiFePO4 as a cathode material for lithium-ion secondary batteries

Ho Chul Shin, Won Il Cho, Ho Jang

Research output: Contribution to journalArticle

175 Citations (Scopus)

Abstract

In this study the effect of the carbon coating on the electrochemical properties of LiFePO4 as a cathode for Li-ion batteries were investigated. The carbon-coated LiFePO4 particles were synthesized by the mechanochemical process and one-step heat treatment. Microscopic observations using SEM and TEM revealed that the carbon coating reduced the particle size of the LiFePO4. The carbon-coated LiFePO4 showed much better performances in terms of the discharge capacity and cycle stability than bare LiFePO4. It was confirmed that the carbon coating decreased the migration distance of Li-ion and enhanced the charge transfer from CV and ac impedance measurements. The improved electrochemical properties of the carbon-coated LiFePO4 were, therefore, attributed to the reduced particle size and enhanced electrical contacts by carbon.

Original languageEnglish
Pages (from-to)1383-1388
Number of pages6
JournalJournal of Power Sources
Volume159
Issue number2
DOIs
Publication statusPublished - 2006 Sep 22

Keywords

  • Carbon coating
  • Lithium iron phosphate
  • Lithium-ion batteries
  • ac impedance

ASJC Scopus subject areas

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

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