Functional binders for reversible lithium intercalation into graphite in propylene carbonate and ionic liquid media

Shinichi Komaba, Naoaki Yabuuchi, Tomoaki Ozeki, Koji Okushi, Hiroharu Yui, Kozo Konno, Yasushi Katayama, Takashi Miura

Research output: Contribution to journalArticle

85 Citations (Scopus)

Abstract

Poly(acrylic acid) (PAA), poly(methacrylic acid) (PMA), and poly(vinyl alcohol) (PVA), which have oxygen species as functional groups, were utilized as a binder for graphite electrodes, and the electrochemical reversibility of lithium intercalation was examined in PC medium and ionic liquid electrolyte, lithium bis(trifluoromethanesulfonyl)amide dissolved in 1-butyl-1-methylpyrrolidinium bis(trifluoromethanesulfonyl)amide (BMP-TFSA). Columbic efficiency of 75-80% with more than 300 mAh g-1 was achieved upon first reduction/oxidation cycle in both electrolytes using these binding polymers, which were significantly improved in comparison to a conventional PVdF binder (less than 45% of columbic efficiency for the first cycle). For the graphite-PVdF electrode, co-intercalation and/or decomposition of PC molecules solvating to Li ions were observed by the electrochemical reduction, resulting in the cracking of graphite particles. In contrast, the co-intercalation and decomposition of PC molecules and BMP cations for the first reduction process were completely suppressed for the graphite electrodes prepared with the polymers containing oxygen atoms. It was proposed that the selective permeability of lithium ions was attained by the uniform coating of the graphite particles with PAA, PMA, and PVA polymers, because the electrostatic interaction between the positively charged lithium ions and negatively charged oxygen atom in the polymer should modulate the desolvation process of lithium ions during the lithium intercalation into graphite, showing the similar functions like artificial solid-electrolyte interphase.

Original languageEnglish
Pages (from-to)6069-6074
Number of pages6
JournalJournal of Power Sources
Volume195
Issue number18
DOIs
Publication statusPublished - 2010 Sep 15

Keywords

  • Binder
  • Graphite
  • Ionic liquid
  • Lithium intercalation
  • Poly(acrylic acid)
  • Propylene carbonate

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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