High-temperature storage and cycling of C-LiFePO4/graphite Li-ion cells

K. Amine, J. Liu, I. Belharouak

Research output: Contribution to journalArticle

272 Citations (Scopus)

Abstract

The high-temperature storage and cycling characteristics of prismatic Li-ion cells with carbon-coated LiFePO4 cathodes, MCMB graphite anodes and a LiPF6/EC-DEC electrolyte were investigated. The cells showed a significant capacity fade when cycled at 37 and 55 °C. Li-Sn reference electrode studies indicated that the interfacial impedance of the graphite electrode increased significantly during high-temperature cycling. Carbon-coated LiFePO4 electrodes were found to release iron ions into the electrolyte when aged at these temperatures; EDAX analyses confirmed the presence of iron at the surface of the graphite electrodes. The observed impedance rise of the graphite electrodes and the consequent capacity fade of the cells were attributed to the formation of interfacial films that were produced on the graphite electrodes as a result of possible catalytic effects of the metallic iron particles. The cycling stability of the cells was improved significantly when the LiPF6 electrolyte salt was replaced with the lithium bis-oxalatoborate LiB(C2O4)2 salt.

Original languageEnglish
Pages (from-to)669-673
Number of pages5
JournalElectrochemistry Communications
Volume7
Issue number7
DOIs
Publication statusPublished - 1 Jul 2005
Externally publishedYes

Fingerprint

Graphite electrodes
Graphite
Ions
Electrolytes
Iron
Carbon
Salts
Temperature
Electrodes
Lithium
Energy dispersive spectroscopy
Anodes
Cathodes
LiFePO4

Keywords

  • High-temperature
  • Li-ion battery
  • LiFePO
  • Lithium bis-oxalatoborate
  • Olivine

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Analytical Chemistry
  • Electrochemistry

Cite this

High-temperature storage and cycling of C-LiFePO4/graphite Li-ion cells. / Amine, K.; Liu, J.; Belharouak, I.

In: Electrochemistry Communications, Vol. 7, No. 7, 01.07.2005, p. 669-673.

Research output: Contribution to journalArticle

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AB - The high-temperature storage and cycling characteristics of prismatic Li-ion cells with carbon-coated LiFePO4 cathodes, MCMB graphite anodes and a LiPF6/EC-DEC electrolyte were investigated. The cells showed a significant capacity fade when cycled at 37 and 55 °C. Li-Sn reference electrode studies indicated that the interfacial impedance of the graphite electrode increased significantly during high-temperature cycling. Carbon-coated LiFePO4 electrodes were found to release iron ions into the electrolyte when aged at these temperatures; EDAX analyses confirmed the presence of iron at the surface of the graphite electrodes. The observed impedance rise of the graphite electrodes and the consequent capacity fade of the cells were attributed to the formation of interfacial films that were produced on the graphite electrodes as a result of possible catalytic effects of the metallic iron particles. The cycling stability of the cells was improved significantly when the LiPF6 electrolyte salt was replaced with the lithium bis-oxalatoborate LiB(C2O4)2 salt.

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