Preparation of Y-doped Li7La3Zr2O12 by co-precipitation method

Preparation of Li7.06La3Y0.06Zr1.94O12 (Y-LLZ) solid electrolyte by the co-precipitation method is studied for the first time. The hydroxy-based co-precipitate would be formed from nitrate salts of Li, La, Zr, and Y. The co-precipitate is decomposed and La2Zr2O7 is formed at < 600 degrees C. High conductive cubic garnet phase is formed around 700 degrees C. This is consistent with previous studies. Well-sintered Y-LLZ pellet with large grains is obtained after sintering at 1000 degrees C for 6 h. The Li ion conductivity is also increased with sintering temperature, and the highest total conductivity is 4.9 x 10(-4) S cm(-1). This value is comparable to previous studies even though sintering temperature in this study is 100 similar to 200 degrees C lower than the previous Y-LLZ studies. Prepared Y-LLZ is a pure ionic conductor, and its electrochemical window is > 8.5 V vs. Li/Li+. Y-LLZ solid electrolyte can be prepared, and the sintering temperature of Y-LLZ can be lowered by the co-precipitation method.

Automated summary

The preparation of Y-LLZ solid electrolyte by the co-precipitation method is studied for the first time, resulting in well-sintered Y-LLZ particles with high Li ion conductivity. The sintering temperature of Y-LLZ can be lowered by using this method.