Electrochemical characteristics of bilayer film of polyaniline composite positive with polymer, electrolyte binder/polymer electrolyte for Li-ion batteries

The bilayer film of polyaniline (PAn), composite positive/polymer electroly te was prepared employing PAn powder as an active material and plasticized PEO-LiClO4 with the ethylene carbonate (EC) and propylene carbonate. (PC) p lasticizer as an electrolyte. The micromorphology and interfacial microstru cture of the composite bilayer film were observed by scanning electron micr oscope (SEM). The effect of the content of polymer electrolyte on the homog eneity of the PAn composite positive film and the interfacial electrochemic al kinetic parameters, the utilization ratio of the active material and dis charge capacity were investigated. It was found that the contacting surface area between the PAn powder and the polymer electrolyte was greatly augmen ted by using polymer electrolyte as a binder. The PAn composite film with g el PEO-based polymer electrolyte (GPE) as the binder exhibited better inter facial compatibility, electrochemical reversibility than the PAn positive f ilm with poly(tetrafluoroethylene) (PTFE) as the binder, and so the utiliza tion ratio of the active material and the high rate discharge ability were observably improved. (C) 2001 Elsevier Science BY. All rights reserved.