SOLID IONIC CONDUCTOR FOR ADVANCED LITHIUM-ION BATTERY

Abstract

Lithium ion batteries are the most promising energy storage system on the market today; however, safety issues associated with the use of flammable organic polymer-based electrolytes with poor electrochemical and chemical stabilities prevent this technology from using these storage devices in high end applications. In this regard, solid electrolyte is a key component for the practical application of rechargeable all-solid-state Li-ion batteries. Generally, solid electrolytes for all-solid state batteries should possess the properties such as high ionic conductivity and negligible electronic conductivity, wide voltage window of 5.5 V and chemical compatibility with the electrodes. Among all solid electrolyte materials ranging from sulphides to oxides and oxynitrides, cubic garnet–type Li7La3Zr2O12 (LLZO) ceramic electrolytes are superior candidates because of their high ionic Conductivity (10−3 to 10−4 S/cm) and good stability against Li metal. The goal of this M.Tech Dissertation is to develop the garnet structured ionic conductor and to generate fundamental understandings with the doping effect of the Fe and Al on frame of Li7La3Zr2O12 (LLZO) which has been successfully achieved through solid state (ceramic) method. Further, we have made an attempt to understand the structural properties and morphological studies, thermal and chemical stability as well as conductivity measurement of the synthesized samples