Abstract
Due to promising ionic conductivity, wide electrochemical window, good chemical and thermal stability, garnet-type Li 7 La 3 Zr 2 O 12 (LLZO) solid electrolyte has attracted much attentions in the field of solid-state lithium batteries. Here, Ga and Sr co-doped LLZO has been prepared via solid-state reaction, and employed as lithium ion solid electrolytes. The results show that Ga 3+ -doping contributes to the formation of stable cubic phase at room temperature and constructing of three-dimensional lithium ion transmission channel. While, Sr-doping can give access to fine-tuning in structure and increase of Li + concentration. The optimized Li 6.5 Ga 0.2 La 2.9 Sr 0.1 Zr 2 O 12 solid electrolyte exhibits the highest ionic conductivity of 5.50 × 10 −4 S cm −1 at room temperature. • Ga and Sr co-doped Li 7 La 3 Zr 2 O 12 is designed and synthesized. • Ga-doping stabilizes cubic phase and Li + diffusion path. • Sr-doping increases the Li + concentration and ionic conductivity. • Li 6.5 Ga 0.2 La 2.9 Sr 0.1 Zr 2 O 12 exhibits highest ionic conductivity of 0.55 mS cm −1 .
Published Version
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