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Garnet-type solid electrolytes Li7La3Zr2−xMg2xO12, Li7La3Zr2−0.75xScxO12 and Li7−2xZnxLa3Zr2O12 with x=0, 0.025, 0.05 and 0.1 were synthesized at 1075°C by using the traditional solid-state reaction method. It is found that substitution of Mg2+ and Sc3+ for Zr4+ is more effective in improving the Li7La3Zr2O12 (LLZ)'s densification and ionic conductivity than the substitution of Zn2+ for Li+. As a...