Intercalation Mechanism in Lithium/Iron-Phthalocyanine Cells

Shigeto Okada, Jun ichi Yamaki

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11 Citations (Scopus)


The cathode reaction mechanism in a lithium//1M LiC104/propylene carbonate (PC)//iron-phthalocyanine (FePc) cell was investigated by x-ray diffraction and atomic absorption spectroscopy. For about 12 e- /FePc depth of discharge, the FePc interlayer distance expanded by about 4.3%. About 9 Li/FePc were found in the cathode pellet by chemical analysis. After recharge, the interlayer distance returned to its initial state and the Li content decreased to 1.4 Li/FePc. These results show that Li+ intercalates to at least a 9 Li/FePc ratio and most of the discharge capacity is reversible on the first cycle. The discrepancy between the electrical charge (∼12 e-/FePc) and the actual Li content in the cathode pellet (∼9 Li/FePc) is caused by side reactions like PC decomposition and FePc anion dissolution during discharge. A different capacity degradation mechanism, C1O4 - intercalation during charging, may also occur.

Original languageEnglish
Pages (from-to)340-344
Number of pages5
JournalJournal of the Electrochemical Society
Issue number2
Publication statusPublished - Feb 1989
Externally publishedYes

All Science Journal Classification (ASJC) codes

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


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