Synthesis and characterization of lithium garnet dispersed composite polymer electrolytes for rechargeable lithium batteries

Abstract

R e c h a rgeable lithium batteries are one of the cutting-edge newlinetechnologies in the development of alternate energy storage systems. Their newlinehigh energy density and long shelf life is a potential combination for newlineapplications in portable electronic devices to hybrid electric vehicles. newlineCommercially available rechargeable lithium batteries contain lithium cobalt newlineoxide (LiCoO2) as positive electrode, lithium as negative electrode and newlinelithium salts dissolved in organic solvent as liquid electrolyte. Rechargeable newlinelithium batteries containing liquid electrolytes are encountered with newlinedisadvantages such as leakage, flammability and explosion. The drawbacks newlineassociated with liquid electrolyte could be eliminated by replacing them by a newlinenon-flammable polymer electrolyte which provides thermal, mechanical and newlinechemical stability. Polymer electrolytes are also capable of withstanding newlinevolume changes and leakage problems. However, polymer electrolytes suffer newlinefrom low lithium-ion conduction at room temperature. Therefore, for the newlinepractical application of polymer electrolyte based rechargeable lithium newlinebatteries, it is essential to develop polymer electrolytes with high lithium ion newline(Li+) conductivity (gt10-3 Scm-1) and wide electrochemical stability (gt5V) at newlineroom temperature (30 oC). The main focus of this dissertation work is to newlineimprove the total Li+ conductivity of polymer electrolytes based on lithium newlinegarnets for rechargeable lithium batteries. newline