High-Speed voltammetry of Mn-doped LiCoO2 using a microelectrode technique

Shinichi Waki, Kaoru Dokko, Takashi Itoh, Matsuhiko Nishizawa, Takayuki Abe, Isamu Uchida

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

The microelectrode technique was applied to investigate the electrochemical properties of LiC1-xMnxO2 (x = 0, 0.01, 0.05, 0.2, or 0.5) synthesized using the citrate process. From the X-ray diffraction measurements, an expansion of the c-axis and a decrease in the crystal size of the materials were observed on substitution of Mn into LiCoO2. In the electrochemical measurements, the high-speed cyclic voltammogram for the Mn-substituted materials gave one set of peaks at 3.9 V vs. Li/Li+. The apparent chemical diffusion constant (Dapp) of LiCo0.8Mn0.2O2 obtained from the potential step experiment was 6.4 × 10-8 cm2/s, which is larger than that of LiCoO2. The increase in Dapp is attributable to the expansion of the c-axis and/or the decrease in the crystal size. In addition, the increase in Mn substitution up to 20% lead to an improvement in the kinetic reversibility and the cycle stability of LiCoO2.

Original languageEnglish
Pages (from-to)205-209
Number of pages5
JournalJournal of Solid State Electrochemistry
Volume4
Issue number4
DOIs
Publication statusPublished - 2000 Jan 1

Keywords

  • Cycle stability
  • High speed voltammetry
  • Kinetic reversibility
  • Lithium cobalt oxide
  • Manganese substitution

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Electrochemistry
  • Electrical and Electronic Engineering

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