All Solid State Li-Ion Batteries Based on Cubic Garnets: From Material Optimization to Thin Film Battery Design
Firstly, we report on Al:Li7-2xLa3Zr2O12 bulk pellet and thin film processing, their crystallization and ionic transport characteristics. Secondly, from a materials processing perspective we report on a new modified sol-gel synthesis-combustion method to lower the nano-particle production of the solids to ~ 600°C. Here, we exemplify stable electrolyte compounds based on Li7-3x(Gax)La3Zr2O12. Thirdly, for N-site doping Li7-xLa3Zr2-xTexO12 with x = 0.25 to 0.35 were prepared by synthesis in solid state, and Te is studied as alternative to Ga and Al stabilizers as battery electrolyte without grain boundary stabilization.
Finally, we concluded on the suitability of these new materials for scaling down to thin film microstructures, as potential Li-garnet electrolytes in all solid state batteries for portable electronic applications. First strategies on how to design optimum thin film-microbatteries adaptable to chemo-mechanical variations during operation will be shown. Here, two different model designs are described: (i.) the fabrication of microbattery dot arrays and (ii.) wrapped anode/electrolyte/cathode microstructures with tunable strain.