Articles
  • Effect of sodium salt in poly(ethylene oxide) electrolyte on initial discharge capacity of Na/poly(ethylene oxide)/S battery
  • Icpyo Kima, Jeong-Hui Kweonb, Jinyoung Parka, Ki-Won Kima, In-shup Ahna, Kwon-Koo Choa, Jou-Hyeon Ahnc, Guoxiu Wanga,e, Ho-Suk Ryud and Hyo-Jun Ahna,*
  • a School of Materials Science and Engineering, RiGET, Gyeongsang National University, Jinju, Korea b LED Development Sales Team, LUSEM, Gumi-si, Korea c Department of Chemical & Biological Engineering, Gyeongsang National University, Jinju, Korea d Department of Materials & Energy Engineering Kyungwoon University, Gumi, Korea e Department of Chemistry and Forensic Science, University of Technology, Sydney, Australia
Abstract
To investigate the effects of sodium salt in a poly(ethylene oxide) (PEO) electrolyte on the initial discharge properties of a Na/ S cell, various concentrations of NaCF3SO3 from 0.1 to 2.0 m were added to the electrolyte. Scanning electron microscopy and differential scanning calorimetry results showed a continuous decrease in the crystallinity of the PEO electrolyte with increasing amounts of sodium salt. The ionic conductivity of the PEO electrolyte at 70 oC increased with increasing sodium salt concentration up to 0.33 m, at which point the highest ionic conductivity of 1.732 × 10-4 S cm−1 was obtained. However, the ionic conductivity decreased at 2.0 m sodium salt. The same trend was seen in the initial discharge capacity, in that the highest value of 435 mAh g−1 was achieved at a sodium salt concentration of 0.33 m. These results demonstrate that 0.33 m of sodium salt is the optimum composition for Na/S batteries.

Keywords: A. organic compounds, B. microstructure, D. electrochemical properties, D. ionic conductivity, D. energy storage.

This Article

  • 2016; 17(8): 799-802

    Published on Aug 31, 2016