Tu Tran Anh, Toan Tran Viet, Anh Luu Tuan, Thang Le Van, Phuc Nguyen Huu Huy
Faculty of Materials Technology, Ho Chi Minh City University of Technology (HCMUT) 268 Ly Thuong Kiet Str., Dist. 10 Ho Chi Minh City Vietnam
Vietnam National University Ho Chi Minh City Linh Trung Ward, Thu Duc Dist. Ho Chi Minh City Vietnam.
RSC Adv. 2024 Feb 14;14(9):5764-5770. doi: 10.1039/d4ra00442f.
LiPS doped with CaX (X = Cl, Br, I) and LiI solid electrolytes were successfully prepared by liquid-phase synthesis using acetonitrile as the reaction medium. Their structure was investigated using XRD, Raman spectroscopy and SEM-EDS. The data obtained from complex impedance spectroscopy was analyzed to study the ionic conductivity and relaxation dynamics in the prepared samples. The XRD results suggested that a part of CaX and LiI incorporated into the structure of LiPS, while the remaining part existed at the grain boundary of the LiPS particle. The Raman peak positions of PS and PS ions in samples 90LiPS-5CaI and 90LiPS-5CaI-5LiI had shifted as compared to the LiPS sample, showing that CaI addition affected the vibration of PS and PS ions. EDS results indicated that CaI and LiI were well dispersed in the prepared powder sample. The ionic conductivity at 25 °C of sample 90LiPS-5CaI-5LiI reached a very high value of 3.1 mS cm due to the improvement of Li-ion movement at the grain boundary and structural improvement upon CaI and LiI doping. This study encouraged the application of LiPS in all-solid-state Li-ion batteries.
以乙腈为反应介质，通过液相合成法成功制备了掺杂CaX（X = Cl、Br、I）的LiPS和LiI固体电解质。使用X射线衍射（XRD）、拉曼光谱和扫描电子显微镜-能谱仪（SEM-EDS）对其结构进行了研究。对从复阻抗谱获得的数据进行分析，以研究制备样品中的离子电导率和弛豫动力学。XRD结果表明，一部分CaX和LiI掺入了LiPS的结构中，而其余部分则存在于LiPS颗粒的晶界处。与LiPS样品相比，样品90LiPS-5CaI和90LiPS-5CaI-5LiI中PS和PS离子的拉曼峰位置发生了偏移，表明添加CaI影响了PS和PS离子的振动。能谱分析结果表明，CaI和LiI在制备的粉末样品中分散良好。由于晶界处锂离子迁移的改善以及CaI和LiI掺杂后结构的改善，样品90LiPS-5CaI-5LiI在25℃时的离子电导率达到了3.1 mS/cm的非常高的值。该研究促进了LiPS在全固态锂离子电池中的应用。
