The preparation of Li7La3Zn2O12(LLZO) battery ceramic and its conductivity

Abstract For Li 7 La 3 Zr 2 O 12 (LLZO) solid electrolytes, higher density usually means higher ionic conductivity. Researchers tried many preparation methods to get high density samples and at same times to realize industrial production, low cost, scalable and fast synthesis techniques. In this paper, the mainstream preparation methods of LLZO was given, as polymerized complex method, sol-gel method, field assisted sintering, combustion technique, auto-consolidation method, water-based solvent method. Among these methods, the last four methods can always increase the density to more than 93%. Especially the field assisted sintering method can make the relative density to be high as 99.8%. And all of these methods can make the ion conductivity to be higher than 1.4 × 10 -4 S cm -1 . Also, most of these methods introduced the Al element into LLZO to realize the liquid sintering.