Solid-state polymer nanocomposite electrolyte of TiO2/PEO/NaClO4 for sodium ion batteries

Yatim Lailun Ni'Mah, Ming Yao Cheng*, Ju Hsiang Cheng, John Rick, Bing Joe Hwang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

253 Citations (Scopus)

Abstract

A free-standing transparent film for sodium-ion conduction in PEO-based solid polymer electrolyte (additionally comprising NaClO4 and nano-sized TiO2) has been fabricated for use in Na-ion batteries by using a solution casting technique. The crystallinity of the solid polymer electrolyte and the interactions between PEO and the Na-ions is characterized by X-ray diffraction (XRD) and Fourier transformed infra-red (FTIR) spectra, which reveals the degree of Na+ ion solvation by PEO oxygen atoms (EO:Na). The ionic conductivities of the films are investigated by impedance analysis from 1 MHz to 1 Hz within the temperature range 303-363 K. A solid polymer electrolyte with anatomic ratio EO:Na = 20 exhibits a maximum ionic conductivity of 1.35 × 10-4 S cm-1, which increases to 2.62 × 10-4 S cm-1 by the addition of TiO2 (3.4 nm, 5 wt%) at temperature 60 °C. The performance of a Na2/3Co2/3Mn1/3O2 half cell with a polymer electrolyte is compared to a similar cell with a liquid electrolyte.

Original languageEnglish
Pages (from-to)375-381
Number of pages7
JournalJournal of Power Sources
Volume278
DOIs
Publication statusPublished - 15 Mar 2015
Externally publishedYes

Keywords

  • Conductivity
  • NaClO
  • PEO
  • Polymer electrolyte
  • Sodium ion battery
  • TiO

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