High resolution cyclic voltammograms of LiMn2-x NixO4 with a microelectrode technique

Kaoru Dokko, Matsuhiko Nishizawa, Isamu Uchida

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

Lithium-ion insertion/extraction at a single particle (10-30 μm in diam.) of LiMn2-xNixO4 (x = 0, 0.2, 0.5) was characterized by a microelectrode technique, in which a fine metal filament was manipulated to make electrical contact with the particle placed in 1 M LiClO4/ PC + EC solution. By using this technique, we can evaluate the correct current-potential behavior of LiMn2-xNixO4 without any dilution due to an organic binder and a conductive additive. The cyclic voltammetry (CV) was performed for the particles up to a high anodic potential limit of 5.2 V vs. Li/Li+. Undoped LiMn2O4 shows two current peaks around 4.1 V due to the redox reaction of Mn3+/4+ in the solid state phase, while the CV of Ni-doped LiMn2O4 was strongly deformed, showing new current peaks in a high potential region (∼ 4.7 V) at the expense of the 4.1 V wave. The 4.7 V wave would arise from the redox reaction of Ni2+/4+. The cyclability of LiMn2-xNixO4 was evaluated by multi-scan cyclic voltammetry.

Original languageEnglish
Pages (from-to)1188-1193
Number of pages6
JournalDenki Kagaku
Volume66
Issue number12
DOIs
Publication statusPublished - 1998

Keywords

  • Doping Effect
  • Lithium Ion Battery
  • Microelectrode Technique
  • Spinel LiMnO

ASJC Scopus subject areas

  • Chemistry(all)

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