(1. 中南大学 材料科学与工程学院，长沙 410083;
2. 中南大学 有色金属材料科学与工程教育部重点实验室，长沙 410083)
摘 要: 采用以聚乙烯醇为聚合剂的湿化学法合成Li
关键字: Li1.3Al0.3Ti1.7(PO4)3；合成；助烧剂；离子导电性
Li1.3Al0.3Ti1.7(PO4)3 based Li-ion conductive materials
（1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. Key Laboratory of Nonferrous Materials Science and Engineering, Ministry of Education, Central South University,
Changsha 410083, China）
Abstract:The Li1.3Al0.3Ti1.7 (PO4)3(LATP) lithium-ion conductive materials were prepared by a wet chemical method which is polymerized by polyvinyl alcohol. The LATP-xLP (x=0, 0.01, 0.03, 0.05, mole fraction) ceramics were prepared by using Li4P2O7(LP) as sintering additive. The phases and microstructures of the prepared materials were investigated by X-ray diffraction and scanning electron microscope. Ionic conductivities were measured by AC impedance measurement. The conduction mechanism of the materials was studied by analyzing the crystal structure and AC impedance characteristics of the materials. The results show that the LATP powder and LATP-xLP (x=0, 0.01, 0.03, 0.05) ceramics have the rhombohedral crystalline structure with the space group of R3-c, which has 3-dimensional ionic conducting path. The LP sintering additive can decrease the sintering temperature of LATP by 150 ℃ and improve the ionic conductivity. The analysis of the DC and AC conductivities of the LATP-0.03LP ceramics reveals that the ionic conductivity is 99.5% of the total conductivity.
Key words: Li1.3Al0.3Ti1.7(PO4)3; synthesis; sintering additive; ionic conductivity
