Electrochemical insertion behavior of lithium ions into mesophase pitch carbon films prepared by electrostatic spray deposition

Seo Jae Lee, Takashi Itoh, Matsuhiko Nishizawa, Kohta Yamada, Isamu Uchida

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

A carbon thin film (thickness, ca. 1μm) was prepared by the electrostatic spray deposition onto a Ni-substrate at 400°C and heat-treated at 500°C in vacuum. Electrochemical lithium ion insertion / extraction properties of the resulting carbon film electrodes were studied by cyclic voltammetry and electrochemical impedance spectroscopy in IM LiClO4 / (PC + EC). In the case of slow scan rates less than 10mV / 22sec in step potential electrochemical spectroscopy, two anodic peaks appeared, indicating that there are two different insertion / extraction mechanisms. Cole-Cole plots of impedance spectra showed two well-separated semicircles and a linear locus. The first semicircle at higher frequency range seems to correspond to the migration of lithium ions through passivating film at carbon surface, and the second semicircle and linear locus arise from carbon thin film itself.

Original languageEnglish
Pages (from-to)1276-1280
Number of pages5
JournalDenki Kagaku
Volume66
Issue number12
DOIs
Publication statusPublished - 1998

Keywords

  • Electrostatic Spray Deposition
  • Lithium-Ion Battery
  • Mesophase Pitch Carbon
  • Thin Film

ASJC Scopus subject areas

  • Chemistry(all)

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