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 LiClO 4 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.