Rapid evaluation of charge/discharge properties for lithium manganese oxide particles at elevated temperatures

Kaoru Dokko, Soichi Horikoshi, Takashi Itoh, Matsuhiko Nishizawa, Takayuki Abe, Minoru Umeda, Isamu Uchida

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

A microelectrode technique was applied to investigate the electrochemical properties of LiMn2O4 particles at elevated temperatures. Cyclic voltammograms of LiMn2O4 were measured after the particles were exposed to the electrolytes. This technique results in rapid and precise evaluation of the redox behavior of the materials. A significant capacity fading was observed in 1 M LiPF6/EC + PC electrolytic solution, which indicates that both LiMn2O4 and LiPF6 participate in the reaction to produce an inert material on the particle surface. Next, the capacity fading for two different BET surface area particles were compared using 1 M LiPF6/EC + PC at 50°C. The reaction was found not to be controlled by the surface area. Finally, a Li1.1Mn1.9O4 particle was employed. The fading in discharge was ca. 10% for 50 cycles even at 50°C, which means that the partial substitution of Mn in LiMn2O4 by Li substantially enhanced the capacity stability.

Original languageEnglish
Pages (from-to)188-193
Number of pages6
JournalJournal of Solid State Electrochemistry
Volume6
Issue number3
DOIs
Publication statusPublished - 2002 Mar

Keywords

  • Charge/discharge properties
  • Elevated temperature
  • Lithium manganese oxide spinel
  • Microelectrode technique

ASJC Scopus subject areas

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

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