“…Besides, YX 3 materials also present the smaller energy barriers in the range 0.004–0.072 eV for Na + transport, which are superior to the conventional sodium-ion solid electrolyte materials, such as Na 11 Sn 2 PS 12 , Na 3 YCl 6 , Na 3 Zr 2 Si 2 PO 12 , etc., ,, with the energy barriers in the range 0.25–0.58 eV. Moreover, the energy barriers (0.35–0.76 eV) of K + diffusion through potassium-ion solid electrolytes, such as K 1.8 Al 1.9 P 0.1 O 4 , K 3 OI, K 0.8 Pb 0.1 GaPO 2 , etc., ,, are also much higher than those (0.006–0.272 eV) of K + transport through YX 3 candidates here.…”