Polymer Blend for Electrolyte and Electrode Coatings

Summary: The thermal and morphological properties of PEO/copolyether electrolyte and carbon black composite have been studied. A copolyether poly(propylene glycol)-block-poly(ethylene glycol)-block-poly(propylene glycol) bis(2-aminopropyl ether) was used at 20 wt.-% in relation to PEO in order the improve the carbon black dispersion through interaction with the amino end capped function. The polymer matrix presented semicrystalline structure and the addition of LiClO₄ and carbon black decreases significantly the crystallinity of the system. Sub-micrometric dispersion of carbon black was observed. The conductivity results as a function of temperature exhibited a typical VTF behaviour for the electrolyte. Almost constant conductivities of 2 × 10^?4 S · cm^?1 were observed for the composite with 5 wt.-% of carbon black, in the range of temperature between 35 and 95 °C, which indicates a significantly contribution of electronic conduction.