Microvoltammetry for cathode materials at elevated temperatures: Electrochemical stability of single particles

Kaoru Dokko, Soichi Horikoshi, Takashi Itoh, Matsuhiko Nishizawa, Mohamed Mohamedi, Isamu Uchida

Research output: Contribution to journalConference articlepeer-review

55 Citations (Scopus)

Abstract

The electrochemical stability of single particles of cathode materials (LiMn2O4, Li1.10Cr0.048Mn1.852O4, LiCoO2 and LiNi0.85Co0.15O2) was investigated by means of a microelectrode technique at 25 °C and 50 °C. The cycle stability was evaluated by multi-cyclic voltammetry. LiMn2O4 showed good cycle stability in LiClO4/propylene carbonate (PC)+ethylene carbonate (EC) and LiBF4/PC+EC solutions even at 50 °C. On the contrary, in LiPF6/PC+EC, significant capacity fading during charge-discharge was observed at 50 °C. The cycle stability of LiMn2O4 in the latter solution was improved by partial substitution of Mn by Cr and Li. Regarding LiCoO2, its cycle life in LiClO4/PC+EC at 50 °C was unsatisfactory when the potential was scanned between 3.60 and 4.30 V. On the other hand, LiCoO2 retained 90% of its capacity when the potential scan was limited to 4.00 V. LiNi0.85Co0.15O2 showed similar trend at 50 °C.

Original languageEnglish
Pages (from-to)109-115
Number of pages7
JournalJournal of Power Sources
Volume90
Issue number1
DOIs
Publication statusPublished - 2000 Sep
EventThe 1999 International Symposium on Rechargeable - Kyoto, Jpn
Duration: 1999 Nov 141999 Nov 16

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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