Imaging the diffusion pathway of Al3+ ion in NASICON-type (Al0.2Zr0.8)20/19Nb(PO4)3 as electrolyte for rechargeable solid-state Al batteries*

Project supported by the National Natural Science Foundation of China (Grant Nos. 51672029, 51372271, and 51172275) and the National Key Research and Development Project from the Ministry of Science and Technology, China (Grant No. 2016YFA0202702).
Wang Jie1, Sun Chun-Wen1, 6, 9, †, Gong Yu-Dong1, Zhang Huai-Ruo2, 3, ‡, Alonso Jose Antonio4, §, Fernández-Díaz María Teresa5, Wang Zhong-Lin1, 6, 7, 9, Goodenough John B8
       

(color online) (a) Close-up of the crystal structure highlighting the Al coordination polyhedra, defined as a trigonal antiprism, where the O2–O2 distances determine the size of the polyhedron and the length of the c unit-cell axis; (b) and (c) thermal variation of the (Nb,Zr)–O–P angles, determining the tilting angle between octahedral and tetrahedral units in the framework of (Al0.2Zr0.8)20/19Nb(PO4)3.