Effect of surface fluorination on the electrochemical behavior of petroleum cokes for lithium ion battery

J. Li, K. Naga, Y. Ohzawa, T. Nakajima, A. I. Shames, A. M. Panich

Research output: Contribution to journalArticlepeer-review

39 Scopus citations

Abstract

Surface structure change and electrochemical behavior of fluorinated petroleum coke samples (petroleum cokes: petroleum coke and those heat-treated at 1860°C, 2300°C and 2800°C, abbreviated to PC, PC1860, PC2300 and PC2800, respectively) have been investigated. Surface oxygen of petroleum coke was decreased by the fluorination using elemental fluorine. Raman and EPR spectroscopies revealed that surface fluorination increased surface disorder and lattice defects. 19F NMR spectrum suggests that distribution of fluorine atoms in PC fluorinated 300°C was similar to that in graphite fluoride with covalent CF bonds. Surface areas of fluorinated petroleum cokes were nearly the same as those of non-fluorinated ones or only slightly increased by fluorination, except PC fluorinated at 300°C. It is noted that first coulombic efficiencies of PC2300 and PC2800 were highly increased to 80-84% by the fluorination at 300°C. These values of 80-84% were 12-18% higher than those of non-fluorinated PC2300 and PC2800.

Original languageEnglish
Pages (from-to)265-273
Number of pages9
JournalJournal of Fluorine Chemistry
Volume126
Issue number2
DOIs
StatePublished - 1 Jan 2005

Keywords

  • Fluorinated carbon
  • Fluorination
  • Lithium rechargeable battery
  • Surface modification

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