All Solid-State Li/Li[sub x]MnO[sub 2] Polymer Battery Using Ceramic Modified Polymer Electrolytes

Abstract

The addition of ceramics to the polymer electrolyte was found to result in an enhancement of the ionic conductivity, especially at temperatures below the crystalline-amorphous transition (normally at 60degreesC), as well as the mechanical property, consistent with other previously reported studies. The electrochemical profile of an all solid-state Li/LixMnO2 based on the ceramics-modified and ceramics-free poly(ethylene oxide) (PEO)-LiClO4 electrolyte has also been studied. We found that the addition of some ceramics, e.g., the metal oxides, could suppress the decomposition of PEO toward the cathode thus showing an improved charge/discharge efficiency upon cycling of an all solid-state Li/LixMnO2. This improved behavior is most likely linked to the fact that the metal oxide additive can form a stable interaction between the ceramic and the PEO segment, thus stabilizing the PEO structure, and protecting the PEO from oxidation. (C) 2002 The Electrochemical Society.