无机分散溶胶-凝胶法制备块状锂基气凝胶

Monolithic Lithium-Based Aerogels via Dispersed Inorganic Sol-Gel Method

摘要: 以无机锂盐(LiCl)的醇溶液为前驱体，聚丙烯酸(PAA)既作为分散剂又为凝胶引导剂，环氧丙烷为凝胶促进剂，采用溶胶-凝胶工艺制备了块状锂基醇凝胶，经CO₂超临界流体干燥工艺，得到白色锂基气凝胶块体样品，其密度约为150 g/m³。用透射电镜(TEM)对气凝胶的微观结构进行分析表明，气凝胶样品由线性骨架构成网络结构。结合红外光谱分析及XPS测试结果分析可知，样品中主要含有锂、碳元素。由BET测试结果可知，样品比表面积达18.9 m²/g。

Abstract: Monolithic lithium-based aerogels were prepared by polyacrylic acid (PAA) and propylene oxide (PO) via the dispersed inorganic sol-gel method and drying with CO₂ supercritical fluid dry process. The density of the prepared sample is about 150 g/m³. The microstructure of the lithium-based aerogels was characterized by TEM, IR, XPS and BET. The results show that the material mainly contains Li, C and O elements. BET surface area is up to 18.9 m²/g.