Novel PEO-based solid composite polymer electrolytes with inorganic-organic hybrid polyphosphazene microspheres as fillers

摘要

Novel solid-state composite polymer electrolytes based on poly (ethylene oxide) (PEO) by using LiClO_4 as doping salts and inorganic-organic hybrid poly (cyclotriphosphazene-co-4,4'-sulfonyldiphenol) (PZS) microspheres as fillers were prepared. Electrochemical and thermal properties of PEO-based polymer electrolytes incorporated with PZS microspheres were studied. Differential scanning calorimetry (DSC) results showed there was a decrease in the glass transition temperature of the electrolytes and the crystallinity of the samples in the presence of the fillers. Maximum ionic conductivity values of 1.2 × 10~(-5) S cm~(-1) at ambient temperature and 7.5 × 10~(-4) S cm~(-1) at 80° were obtained and lithium ion transference number was 0.29. Compared with traditional ceramic fillers such as SiO_2, the addition of PZS microspheres increased the ionic conductivity of the electrolytes slightly and led to remarkable enhancement in the lithium ion transference number.