固化剂对喷雾干燥-焙烧法制备快离子导体Li_(1.3)Al_(0.3)Ti_(1.7)(PO_4)_3的影响

Effect of solidifying agent on preparation of Li_(1.3)Al_(0.3)Ti_(1.7)(PO_4)_3 by spray-drying and post-calcining method

采用喷雾干燥法合成Li1.3Al0.3Ti1.7(PO4)3的前驱体,将所得前驱体在不同温度下焙烧得到锂离子固态电解质Li1.3Al0.3Ti1.7(PO4)3,研究固化剂PEG-6000对合成过程的影响。通过X射线衍射(XRD)、扫描电镜(SEM)、热重分析(TG-DTA)和傅里叶变换红外光谱(FTIR)对合成样品进行表征。结果表明:喷雾干燥法得到的前驱体均为球型颗粒,粒度为2～5μm,添加固化剂的前驱体颗粒更细;固化剂降低前驱体合成纯相Li1.3Al0.3Ti1.7(PO4)3的焙烧温度;无固化剂的前驱体在800℃下焙烧得到纯相Li1.3Al0.3Ti1.7(PO4)3;添加固化剂的前驱体在700℃下得到纯相Li1.3Al0.3Ti1.7(PO4)3。

The solid state electrolyte Li1.3Al0.3Ti1.7（PO4）3 was prepared by post-calcining the precursors obtained through spray-drying method. The effect of PEG-6000 addition on the microstructure and calcination temperature ofLi1.3Al0.3Ti1.7（PO4）3 was studied. The prepared samples were characterized by X-ray powder diffraction, scanning electron microscopy, therrnogravimetric analysis and differential thermal analysis and Fourier transform infrared spectroscopy. The results show that the precursors obtained by spray-drying are spherical particles with the average size of 2-5 μm. With the addition of PEG-6000, the decomposition and crystallinity temperature decrease, the particle sizes of the powders become smaller. The precursors without PEG-6000 calcined at 800 ℃ are well crystallized while the precursors with PEG-6000 are also well crystallized at only 700 ℃.