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Studies on a nanocomposite solid polymer electrolyte with hydrotalcite as a filler

Authors
Journal
Solid State Ionics
0167-2738
Publisher
Elsevier
Publication Date
Volume
181
Identifiers
DOI: 10.1016/j.ssi.2010.05.040
Keywords
  • Nanocomposite Polymer Electrolyte
  • Hydrotalcite
  • Clay-Nanocomposite
  • Ionic Conductivity
Disciplines
  • Chemistry

Abstract

Abstract We have prepared a new nanocomposite polymer electrolyte using nanoparticles of hydrotalcite, an anionic clay, as the filler. Hydrotalcite has the chemical composition [M 1 − x 2+ M x 3+( OH) 2] x+ [(A x/ n n −·mH 2O] where M 2+ is a divalent cation (e.g. Mg 2+, Ni 2+, Co 2+,etc.) and M 3+ is a trivalent cation (e.g. Al 3+, Fe 3+, Cr 3+, etc.). A n− is an anion intercalated between the positively charged double hydroxide layers. The nanoparticles of [Mg 0.67Al 0.33(OH) 2] [(CO 3) 0.17·mH 2O] were prepared by the co-precipitation method (average particle size as observed by TEM ∼ 50 nm) and were doped into poly(ethylene glycol) PEG (m.w. 2000) complexed with LiClO 4. Samples with different wt.% of hydrotalcite were prepared and characterized using XRD, DSC, TGA, impedance spectroscopy and NMR. Ionic conductivity for the pristine sample, ∼ 7.3 × 10 − 7 S cm − 1 , was enhanced to a maximum of =1.1 × 10 − 5 S cm − 1 for 3.6 wt.% nanoparticle doped sample. We propose that the enhancement of ionic conductivity is caused by percolation effects of the high conductivity paths provided by interfaces between the nanoparticles and the polymer electrolyte.

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