Synthesis of LiFePO4/C nanocomposites by a novel process and their electrochemical properties

Izumi Taniguchi, Renat Tussupbayev

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

LiFePO4/C composites were successfully prepared by emulsion drip combustion in a fluidized bed reactor followed by heat treatment from the precursor solution; LiNO3, Fe(NO3)3·9H2O and H3PO4 were stoichiometrically dissolved in distilled water. The ordered LiFePO4 olivine structure could be obtained after the heat treatment of the as-prepared samples was performed at temperature ranges from 500 to 800°C in N2+3% H2 atmosphere. It was also confirmed from the transmission electron microscopy (TEM) observation with electron diffraction spectrometry (EDS) that the final samples were LiFePO4/C composites with larger secondary particles. The LiFePO4/C composites were prepared at 600°C and then annealed at 700°C exhibited a first discharge capacity of 93mAhg-1 at a 0.1C rate, which corresponded to 55% of the theoretical capacity.The as-prepared sample at 600°C by the emulsion drip combustion was milled in ethanol by a planetary ball-milling and then annealed at 700°C for 4h in N2+3% H2 atmosphere. It was clearly seen from scanning electron microscopy(SEM) and TEM images with EDS that the final sample was made up of agglomerates with approximately 100nm primary particles covered with a thin carbon layer. As a result, LiFePO4/C nanocomposites could be successfully prepared by a combination of emulsion drip combustion and wet ball-milling followed by heat treatment. The LiFePO4/C nanocomposites delivered a first discharge capacity of 147mAhg-1 (86% of theoretical capacity) at a 0.1C rate. The capacity retention after 100 cycles for the cell was 98% at a 1C rate.

Original languageEnglish
Pages (from-to)334-342
Number of pages9
JournalChemical Engineering Journal
Volume192
DOIs
Publication statusPublished - Jun 1 2012

Keywords

  • Cathode
  • Emulsion drip combustion
  • Fluidized bed
  • Lithium iron phosphate
  • Lithium-ion batteries

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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