流延法制备高致密固态电解质LATP的研究∗

摘要

Sol-gel method was adopted to prepare ultrafine Li1. 3 Al0. 3 Ti1. 7 ( PO4 ) 3 ( LATP ) Powders. The LATP biscuit with excellent machinability was prepared by tape-casting technology. The biscuit presented a high density after sintered. DSC-TG was used to test thermal properties. The structure and morphology of the synthesized powders were investigated by XRD and SEM and ionic conductivities were measured by EIS. The results show that the products prepared by sol-gel method were LATP powders with particle size of 200 ~300 nm. The heating temperature of the synthesized powders decreased to 150 ℃, and it exhibited that the powders obtained better crystallinity. The relative density of sintered LATP sheet reached 99% and its conductivity was 2. 19×10-4 S·cm-1.%采用溶胶凝胶法合成了超细固态电解质Li1．3Al0．3Ti1．7(PO4)3(LATP)前驱体粉体,通过配制浆料和流延工艺制备了加工性能良好的LATP素坯体。利用差示扫描量热分析了LATP前驱体的热分解过程,采用X射线衍射、扫描电镜、交流阻抗法对不同烧结工艺条件下LATP玻璃-陶瓷片的结构、形貌和电导率进行分析表征。结果表明,采用溶胶凝胶法制备的LATP前驱体粉体的平均粒径为200 nm,且分布均匀。纳米级的粒径尺寸使得LATP前驱体粉末在烧结过程中具有更好的反应活性,结晶温度比固相烧结法制备的LATP下降了150℃,烧结性能好。通过优化烧结工艺,制备的LATP玻璃陶瓷体的相对密度高达99%,室温电导率为2．19×10-4 S·cm-1。