硅酸盐学报, 2022, 50 (3): 769, 网络出版: 2022-11-11
LiOH对Ta掺杂石榴石型Li7La3Zr2O12固体电解质的影响
Effect of LiOH on Tantalum Doped Li7La3Zr2O12 Garnet Solid Electrolyte
固体电解质 石榴石型 锂镧锆氧 固相反应 锂离子电导率 solid state electrolyte garnet-type lithium lanthanum zirconium oxides solid state reaction lithium ion conduction
摘要
通过固相法制备Ta掺杂Li7La3Zr2O12(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Li7La3Zr2O12在全固态锂离子电池中具有广阔的应用前景。
Abstract
Tantalum (Ta) doped Li7La3Zr2O12 (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 Li7La3Zr2O12 prepared via solid-state reaction has a great potential in the application of all-solid-state lithium ion batteries.
宋健, 张航, 薛丽红, 张五星, 严有为. LiOH对Ta掺杂石榴石型Li7La3Zr2O12固体电解质的影响[J]. 硅酸盐学报, 2022, 50(3): 769. SONG Jian, ZHANG Hang, XUE Lihong, ZHANG Wuxing, YAN Youwei. Effect of LiOH on Tantalum Doped Li7La3Zr2O12 Garnet Solid Electrolyte[J]. Journal of the Chinese Ceramic Society, 2022, 50(3): 769.
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