Room-temperature ionic conductivity of Ba,Y,Al co-doped Li7La3Zr2O12 solid electrolyte after sintering

• 作者: Xiao-Zhen Liu Lei Ding Yu-Ze Liu Li-Ping Xiong Jie Chen Xiao-Long Luo
• 来源期刊: 稀有金属（英文版）
• 年，卷（期）: 2021,（8）
• 所属期刊栏目: ORIGINAL ARTICLES
• 页码范围: 2301-2306
• 页数: 6页
• 语种: 英文

摘要

The Ba,Y and Al co-doped Li7La3Zr2O12(LLZO) was prepared by the solid-state reaction method.Effect of sintering on the crystallographic structure,mor-phology,total conductivity,relative density and con-tractibility rate of the prepared solid electrolyte was studied,respectively.The sintered samples were charac-terized by X-ray diffractometer (XRD),scanning electron microscopy (SEM),electrochemical impedance spectra(EIS) and inductively coupled plasma atomic emission spectrometry (ICP-AES) techniques,respectively.The cubic garnet phase Ba,Y and Al co-doped LLZO is obtained,and the room-temperature total conductivity of the Ba,Y and Al co-doped LLZO solid electrolyte is improved significantly by eliminating the grain boundary resistances and improving the densifications with control-ling sintering temperature (7) and time (t),respectively.Sintering at 1160-1190 ℃ for 12 h and at 1190 ℃ for 6-15 h,respectively,the Ba,Y and Al co-doped LLZO solid electrolytes are cubic garnet phase.Sintering at 1180-1190 ℃ for 12 h and at 1190 ℃ for 12-18 h,respectively,SEM images of the cross section of the Ba,Y and Al co-doped LLZO solid electrolytes exhibit the dis-tinctively flattened morphology without any noticeable grain boundaries.The total conductivity,relative density and contractibility rate of Li6.52La2.98-Ba0.02Zr1.9Y0.1Al0.2O12 solid electrolyte are 2.96 × 10-4 S·cm-1,94.19％ and 18.61％,respectively.