Zirconium-substituted LiSn2P3O12 solid electrolytes prepared via sol-gel method

摘要

Li1.5Sn2P2.5Zr0.5O12 compound was synthesized using a simple and economical water-based sol-gel technique. XRD analysis showed that the compound contains a NASICON-structured rhombohedral crystalline phase and Zr4+ as successfully substituted into the LiSn2P3O12 structure instead of forming impurities. The compound displayed a greater conductivity value compared to the unsubstituted parent compound, LiSn2P3O12. The Li1.5Sn2P2.5Zr0.5O12 compound displayed total conductivity values of 1.32 9 10(-6) S cm(-1) at room temperature and 5.77 x 10(-5) S cm(-1) at 500 degrees C. Furthermore, the AC conductivity, sigma(AC), was found to increase with rising temperature and the outcomes were discussed using the correlated barrier hopping model. The Li1.5Sn2P2.5Zr0.5O12 compound was also electrochemically stable up to 5.2 V, which was greater than the unsubstituted parent compound. Meanwhile, the transference number measurement was near to unity and it can be inferred that the majority of mobile charge carriers were ions and anticipated to be Li+.