A mixed aqueous/aprotic sodium/air cell using a NASICON ceramic separator

Katsuro Hayashi, Kazunari Shima, Fumiaki Sugiyama

Research output: Contribution to journalArticle

60 Citations (Scopus)

Abstract

An aqueous (mixed aqueous/aprotic) Na-air cell is fabricated and its discharge properties are examined experimentally. This design is attractive because Na is not only more abundant and cheaper than Li, but also potentially advantageous for enhancing cell output. The theoretical energy density of the aqueous Na-air cell exceeds that of a Li one under conditions where precipitation of hydroxides in the aqueous electrolyte is not allowed. Na 3Zr2Si2PO12 (NASICON) ceramics, which has a Na+ ion conductivity of 2 × 10-3 S · cm-1 at 50°C, is used as a solid electrolyte separator in the Na-air cell. Involvement of O2 gas in the cell reaction is verified by changing cell voltage in the presence or absence of O2 flow through the aqueous electrolyte. The Na-air cell exhibits an electrochemical discharge of ∼600 mAh· g-1 and energy density of ∼1500 Wh· kg-1 based on the weights of reacted Na and H2O. Its maximum areal output power is 11 mW· cm -2 and depends on the thickness of the NASICON ceramic separator, the concentration of NaOH in the aqueous electrolyte and the type of cathode, suggesting that cell performance can be improved by optimization of these components.

Original languageEnglish
JournalJournal of the Electrochemical Society
Volume160
Issue number9
DOIs
Publication statusPublished - 2013
Externally publishedYes

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separators
Separators
Sodium
sodium
ceramics
Electrolytes
air
Air
cells
Discharge (fluid mechanics)
Hydroxides
Solid electrolytes
electrolytes
Cathodes
flux density
Gases
Ions
output
Electric potential
solid electrolytes

All Science Journal Classification (ASJC) codes

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

Cite this

A mixed aqueous/aprotic sodium/air cell using a NASICON ceramic separator. / Hayashi, Katsuro; Shima, Kazunari; Sugiyama, Fumiaki.

In: Journal of the Electrochemical Society, Vol. 160, No. 9, 2013.

Research output: Contribution to journalArticle

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