Electrochemical quartz crystal microbalance investigations of LiMn2O4 thin films at elevated temperatures

Takayuki Uchiyama, Matsuhiko Nishizawa, Takashi Itoh, Isamu Uchida

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53 Citations (Scopus)

Abstract

Electrochemical properties of a LiMn2O4 film in 1 M LiPF6/PC + EC solution was studied by means of the electrochemical quartz crystal microbalance (QCM) at an elevated temperature (50°C). The film preparation was conducted by an electrostatic spray deposition, which enabled us to obtain a uniform and dense film of LiMn2O4 on a QCM electrode at low temperature (400°C) to avoid the thermal damage of the quartz. During the galvanostatic charge-discharge experiment, the mass of electrode specimen increased, most likely due to the formation of a passivation film. If an as-prepared electrode was only immersed in the LiPF6 solution at 50°C, the mass of electrode decreased steadily, resulting eventually in extinction of the manganese film. Such manganese dissolution was attended by a shift of open circuit voltage from 3.8 to 4.3 V vs. Li, suggesting a formation for λ-MnO2 as an intermediate in the dissolution reaction.

Original languageEnglish
Pages (from-to)2057-2060
Number of pages4
JournalJournal of the Electrochemical Society
Volume147
Issue number6
DOIs
Publication statusPublished - 2000 Jun 1

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

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