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Conventional lithium batteries using an organic polymer electrolyte, exhibit several safety issues including leakage, poor chemical stability and flammability. To address these safety concerns the idea of a solid electrolyte has emerged. In the lab we specifically focused on the solid garnet-type electrolytes. The solid electrolyte of Li_6.28Al_0.24La₃Zr₂O₁₂ and Li_7.28Al_0.24La₃Zr₂O₁₂ (LALZO) powder were successfully synthesized by a co-precipitation method. LALZOpellets were then sintered at 1100 °C at different sintering times of 4,8, and 16 hours. With the lithium content of 7.28 per formula, impurity of La₂O₃ was obtained at the sintering time of 4 hours. When the sintering time increased to 8 and 16 hours, in addition to the La₂O₃, La₂Zr₂O₇ phase was obtained. When the lithium content decreased to 6.28 per formula, impurities of La₂O₃ and La₂Zr₂O₇ were obtained. The lattice parameters are all similar for different lithium content and different sintering times and are within the range of 12.93-12.97Å.