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<xref rid="cpb_27_12_128201fn1" ref-type="fn">*</xref><fn id="cpb_27_12_128201fn1"><label>*</label>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).</fn>

Imaging the diffusion pathway of Al³⁺ ion in NASICON-type (Al_0.2Zr_0.8)_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-Wen^{1, 6, 9, †}, Gong Yu-Dong¹, Zhang Huai-Ruo^{2, 3, ‡}, Alonso Jose Antonio^{4, §}, Fernández-Díaz María Teresa⁵, Wang Zhong-Lin^{1, 6, 7, 9}, Goodenough John B⁸

(color online) Room temperature STEM characterizations of (Al_0.2Zr_0.8)_20/19Nb(PO₄)₃. (a) Atomic resolution HAADF image overlapped with a structural model of a unit cell viewed along [010] zone-axis. The magenta, red and yellow spheres represent Nb/Zr, P, and Al site respectively. Oxygen was omitted for clarity. Yellow arrows illustrate the Al³⁺ ion columns. (b) Intensity profile measured from the dash–dot line AB in panel (a), yellow arrows illustrating the position of Al³⁺-site. The weak peaks shown by the magenta arrows come from the O^2– ion columns along the dash–dot line AB.