Kwatek Konrad, Ślubowska Wioleta, Nowiński Jan Leszek, Krawczyńska Agnieszka Teresa, Sobrados Isabel, Sanz Jesús
Faculty of Physics, Warsaw University of Technology, 00-662 Warsaw, Poland.
Faculty of Materials Science and Engineering, Warsaw University of Technology, 02-507 Warsaw, Poland.
Materials (Basel). 2021 Sep 30;14(19):5729. doi: 10.3390/ma14195729.
The currently studied materials considered as potential candidates to be solid electrolytes for Li-ion batteries usually suffer from low total ionic conductivity. One of them, the NASICON-type ceramic of the chemical formula LiAlTi(PO), seems to be an appropriate material for the modification of its electrical properties due to its high bulk ionic conductivity of the order of 10 S∙cm. For this purpose, we propose an approach concerning modifying the grain boundary composition towards the higher conducting one. To achieve this goal, LiSiO was selected and added to the LATP base matrix to support Li diffusion between the grains. The properties of the LiAlTi(PO)-LiSiO (0.02 ≤ ≤ 0.1) system were studied by means of high-temperature X-ray diffractometry (HTXRD); Li, Al, Si, and P magic angle spinning nuclear magnetic resonance spectroscopy (MAS NMR); thermogravimetry (TG); scanning electron microscopy (SEM); and impedance spectroscopy (IS) techniques. Referring to the experimental results, the LiSiO additive material leads to the improvement of the electrical properties and the value of the total ionic conductivity exceeds 10 S∙cm in most studied cases. The factors affecting the enhancement of the total ionic conductivity are discussed. The highest value of = 1.4 × 10 S∙cm has been obtained for LATP-0.1LSO material sintered at 1000 °C for 6 h.
目前被视为锂离子电池固体电解质潜在候选材料的研究材料通常总离子电导率较低。其中一种化学式为LiAlTi(PO)的NASICON型陶瓷，由于其高达10 S∙cm量级的体相离子电导率，似乎是一种适合用于改善其电学性能的材料。为此，我们提出一种方法，即朝着更高导电率的方向改变晶界组成。为实现这一目标，选择LiSiO并添加到LATP基基体中以促进锂在晶粒间的扩散。通过高温X射线衍射法（HTXRD）、锂、铝、硅和磷魔角旋转核磁共振光谱法（MAS NMR）、热重分析法（TG）、扫描电子显微镜法（SEM）和阻抗谱法（IS）等技术研究了LiAlTi(PO)-LiSiO（0.02 ≤ ≤ 0.1）体系的性能。参考实验结果，LiSiO添加剂材料可改善电学性能，在大多数研究情况下总离子电导率值超过10 S∙cm。讨论了影响总离子电导率提高的因素。对于在1000 °C烧结6小时的LATP-0.1LSO材料，已获得最高值 = 1.4 × 10 S∙cm 。
