Synthesis of Ga-doped Li7La3Zr2O12 solid electrolyte with high Li+ ion conductivity. Issue 2 (15th January 2021)

• Record Type: Journal Article
• Authors: Huang, Xiao; Su, Jianmeng; Song, Zhen; Xiu, Tongping; Jin, Jun; Badding, Michael E.; Wen, Zhaoyin
• Is Part Of: Ceramics international. Volume 47:Issue 2(2021)
• Page Start: 2123
• Page End: 2130
• Publication Date: 2021-01-15
• Subjects: Li-garnet -- c-LLZO -- Solid electrolyte -- Ga-doping -- High conductivity -- Synthesis; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2020.09.047
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Garnet-type Li7 La3 Zr2 O12 (LLZO) Li + ion solid electrolyte is a promising candidate for next generation high-safety solid-state batteries. Ga-doped LLZO exhibits excellent Li + ion conductivity, higher than 1 × 10 −3 S cm −1 . In this research, the doping amount of Ga, the calcination temperature of Ga-LLZO primary powders, the sintering conditions and the evolution of grains are explored to demonstrate the optimum parameters to obtain a highly conductive ceramics reproducibly via conventional solid-state reaction methods under ambient air sintering atmosphere. Cubic LLZO phase is obtained for Li6.4 Ga0.2 La3 Zr2 O12 powder calcined at low temperature 850 °C. In addition, ceramic pellets sintered at 1100 °C for 320 min using this powder have relative densities higher than 94% and conductivities higher than 1.2 × 10 −3 S cm −1 at 25 °C.