LiOH对Ta掺杂石榴石型Li_(7)La_(3)Zr_(2)O_(12)固体电解质的影响  

Effect of LiOH on Tantalum Doped Li_(7)La_(3)Zr_(2)O_(12) Garnet Solid Electrolyte

作　　者：宋健[1] 张航 薛丽红[1] 张五星[1] 严有为[1] SONG Jian;ZHANG Hang;XUE Lihong;ZHANG Wuxing;YAN Youwei(State Key Laboratory of Materials Processing and Die&Mould Technology,School of Materials Science and Engineering,Huazhong Universtiy of Scienc and Technology,Wuhan 430074,China)

机构地区：[1]华中科技大学材料科学与工程学院,材料成形与模具技术国家重点实验室,武汉430074

出　　处：《硅酸盐学报》2022年第3期769-774,共6页Journal of The Chinese Ceramic Society

基　　金：国家重点研发计划(2016YFB0100302)。

摘　　要：通过固相法制备Ta掺杂Li_(7)La_(3)Zr_(2)O_(12)(Ta-LLZO)陶瓷,以LiOH为锂源合成Ta-LLZO粉末,并以LiOH为助烧剂制备Ta-LLZO陶瓷,研究了LiOH对Ta-LLZO陶瓷的组织结构和离子电导率的影响。结果表明:以LiOH为锂源可促进立方相Ta-LLZO的生成。同时,以LiOH为助烧剂,可有效促进陶瓷的致密化,在1 200℃烧结5 h可获得致密的立方相Ta-LLZO陶瓷。当助烧剂的添加量为6%(质量分数)时,陶瓷的离子电导率可达6.23×10^(-4)S·cm^(-1)。可见,固相法制备的Li_(7)La_(3)Zr_(2)O_(12)在全固态锂离子电池中具有广阔的应用前景。Tantalum (Ta) doped Li_(7)La_(3)Zr_(2)O_(12)(Ta-LLZO) ceramics were prepared via conventional solid-state reaction.LiOH was used as a lithium source and a sintering additive for ceramics.The effect of LiOH on the microstructure and ionic conductivity of Ta-LLZO ceramics was investigated.The results show that LiOH as a lithium source can promote the formation of cubic Ta-LLZO,and LiOH as a sintering additive can effectively improve the densification of ceramics.The dense cubic garnet Ta-LLZO ceramics were obtained by sintering at 1 200℃for 5 h.When the amount of the sintering additive is 6%(in mass fraction),the ionic conductivity of ceramics reaches 6.23×10^(-4)S·cm^(-1).It is indicated that Li_(7)La_(3)Zr_(2)O_(12)prepared via solid-state reaction has a great potential in the application of all-solid-state lithium ion batteries.

关 键 词：固体电解质 石榴石型 锂镧锆氧 固相反应 锂离子电导率 

分 类 号：TM911[电气工程—电力电子与电力传动]