Electrochemical stability and conductivity enhancement of composite polymer electrolytes

The electrochemical stability behavior of the composite polymer electrolytes obtained by adding a fine Al 2O 3 powder (activated acidic, neutral, and basic) with a diameter of 5.8 nm to the poly(ethylene oxide) (PEO)–LiClO 4 is described. The strong hydrogen bond between the surface group of Al 2O 3 and lithium salt anion prevents the decomposition of lithium salt anion. An enhancement of the ionic conductivity for the composite polymer electrolytes prepared with Al 2O 3 and BaTiO 3 is described in terms of a reduction of crystallinity and an increase of charge carrier concentration.