Na ion- Conducting Ceramic as Solid Electrolyte for Rechargeable Seawater Batteries

  • Kim Y
  • Kim H
  • Park S
 et al. 
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Abstract

This study describes the assembly of a rechargeable seawater battery using hard carbon as the anode, seawater as the cathode, and a fast Na ion-conducting ceramic as the solid electrolyte. Two different Na ion-conducting ceramics, β″-Al2O3and Na3Zr2Si2PO12(NASICON), are used as the solid electrolytes in this study. The discharge capacity of the seawater battery with the NASICON solid electrolyte is 120 mAh g-1after the first cycle and over 91% coulombic efficiency after twenty cycles. However, under the same experimental conditions, the discharge capacity of the seawater battery with a β"-Al2O3electrolyte significantly drops to 10 mAh g-1after one cycle. It is observed that the stability of NASICON in seawater is superior to that of β"-Al2O3and impedance results of NASICON are not changed significantly compared to that of β"-Al2O3after cycling tests. The stability of Na ion-conducting ceramics in seawater and their effects on the electrochemical performance of seawater batteries are presented and discussed.

Author-supplied keywords

  • NASICON
  • Na-ion conducting ceramic
  • Seawater battery
  • β″ - Al2O3

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Authors

  • Yongil Kim

  • Hyojin Kim

  • Sangmin Park

  • Inseok Seo

  • Youngsik Kim

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