Electrochemical Properties of Cathode Material LiFePO4 with Ti Substitution

Hui Fang, Hui Fang, Gan Liang, Timothy Wallace, Hanu Arava, Liang Zhao, Lu Lu Zhang, Alexander Ignatov, Mark C. Croft, Mark C. Croft

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Ti substituted LiFePO4 with nominal composition Li1-4yTiyFePO4 (y = 0, 0.01, 0.02, 0.03, 0.04, and 0.05) cathode materials were prepared by solid-state reaction. The as-prepared samples were characterized by X-ray diffraction, X-ray absorption spectroscopy, cyclic charge-discharge, cyclic voltammograms, and electrochemical impendence spectroscopy. The X-ray diffraction results indicate that the increase of Ti4+ amount leads to the expansion of the LiFePO4 lattice monotonically, but the XAS reveals that small amount of doped Ti can also form TiO2-anatase impurities. At 0.1 C rate, doping of Ti causes a decrease in charge and discharge capacities. However, at higher C rate, the charge/discharge capacities are improved. Li0.96Ti0.01FePO4 exhibits the optimized electrochemical performance.

Original languageEnglish (US)
Pages (from-to)A3148-A3152
JournalJournal of the Electrochemical Society
Volume160
Issue number5
DOIs
StatePublished - Jan 2013

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

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