LiOH对Ta掺杂石榴石型Li7La3Zr2O12固体电解质的影响

宋健; 张航; 薛丽红; 张五星; 严有为

doi:doi:10.14062/j.issn.0454-5648.20210246

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

论文大纲

宋健张航薛丽红张五星严有为

作者单位

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

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.

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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.

LiOH对Ta掺杂石榴石型Li₇La₃Zr₂O₁₂固体电解质的影响

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