Measurements of chemical diffusion coefficient of lithium ion in graphitized mesocarbon microbeads using a microelectrode

Matsuhiko Nishizawa, Ryuichi Hashitani, Takashi Itoh, Tomokazu Matsue, Isamu Uchida

Research output: Contribution to journalArticlepeer-review

94 Citations (Scopus)

Abstract

The solid-state diffusion of lithium ion in carbon was directly investigated in single spherical particles of graphitized mesocarbon microbeads (MCMB, Osaka Gas Co.). In order to achieve electrochemical measurements focusing on a single particle, a molybdenum-filament microelectrode was maneuvered to make electrical contact with a single MCMB placed in an organic solvent mixture containing lithium ions as an electrolyte. This novel microelectrode technique gives electrochemical information about a MCMB particle, itself, without any dilution with additives such as organic binders. The chemical diffusion coefficient (D) of lithium ion was determined from potential-step chronoamperograms assuming spherical diffusion of lithium ions in the MCMB particle. The values of D were found to change the order between 10-9 and 10-11 cm2/s depending on the electrode potential. Plots of D showed pronounced minima at the potentials where the transformation of staging level of lithium intercalation compounds occurred.

Original languageEnglish
Pages (from-to)10-12
Number of pages3
JournalElectrochemical and Solid-State Letters
Volume1
Issue number1
Publication statusPublished - 1998 Jul 1

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Materials Science(all)
  • Physical and Theoretical Chemistry
  • Electrochemistry
  • Electrical and Electronic Engineering

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