Preparation and characterization of Li1.1Mn2O4/polymer electrolyte graphite cell

Solid state batteries with lithium and an insertion material as active elec trode components and a poly (ethylene oxide) based electrolyte, have proven to be feasible alternatives to the classical secondary battery systems. Th e solid state electrochemical cell Li-1.1 Mn2O4 \ PEO:LiClO4 \ Graphite was fabricated by sandwiching the thin electrolyte film between the cathode an d anode pellets. This sandwich was pressed between suitable current collect ors in a spring tight sample holder assembly. The complex impedance of elec trolyte and Li-1.1 Mn2O4 was measured and discharge characteristics were st udied for various loads. Also energy densities were calculated. Constant cu rrent discharge curves were obtained at several load values. The observed e nergy density is 47 J/kg for 0.1 M ohm load. The lithium salt content of th e polymer electrolyte is found to decrease at the positive electrode whilst increasing at the lithium side. Thr: results predict that the critical cha rge at which the curves deviate should be inversely proportional to the cur rent.