Charge-transfer reaction rate at the LiMn2O4 spinel oxide cathode/polymer electrolyte interface

Yoshiharu Uchimoto, Koji Amezawa, Tomoya Furushita, Masataka Wakihara, Izumi Taniguchi

Research output: Contribution to journalConference articlepeer-review

13 Citations (Scopus)

Abstract

Charge-transfer resistance at the LiMn2O4 thin film cathode/polyether based electrolyte interfaces was investigated. The thin film cathodes were prepared by electrostatic spray deposition (ESD) method, and charge-transfer resistances at the cathode/polymer electrolyte interfaces were measured by electrochemical impedance spectroscopy in the poly(ethylene glycol) dimethyl ether (PEGDME) whose average molecular weight is 500 (PEGDME500) dissolving LiCF3SO3 by adding various amounts of polyether having higher average molecular weight of 1000 (PEGDME1000). It was found that the charge-transfer resistance increased with increasing amounts of PEGDME1000. The Gibbs activation energies and the solvation state of lithium ions were almost constant with the amounts of PEGDME1000. On the other hand, the charge-transfer resistance was proportional to the viscosity of the electrolyte. It was suggested that the viscosity of the electrolyte was one of the important factors for the charge-transfer reaction rate at the LiMn2O 4 cathode/polyether based electrolytes interfaces.

Original languageEnglish
Pages (from-to)2377-2381
Number of pages5
JournalSolid State Ionics
Volume176
Issue number31-34
DOIs
Publication statusPublished - 2005 Oct 1
Externally publishedYes
Event30th Symposium on Solid State Ionics in Japan -
Duration: 2004 Dec 12004 Dec 3

Keywords

  • Charge-transfer
  • Lithium battery
  • Polymer electrolyte
  • Spinel

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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