Li3/8Sr7/16−xAxZr1/4Nb3/4O3 (A = Ca, Ba) ceramics were prepared by the conventional solid-state reaction method. The structures of prepared ceramic materials changed from cubic perovskite to tetragonal tungsten bronze with increasing barium (Ba) content as indicated by the x-ray diffraction (XRD) patterns. Li3/8Sr7/16−xBaxZr1/4Nb3/4O3 (x = 0.05, 0.10) samples are mixtures of perovskite and tetragonal tungsten bronze phases. Calcium ions (Ca2+) can partially occupy the Sr sites, and thus the cubic perovskite structure remains intact. However, an unknown phase could form because of a complete substitution of Ca for Sr; the ionic conductivity measured by the alternating-current impedance spectra of samples decreases with increasing Ba and Ca content. Parent Li3/8Sr7/16Zr1/4Nb3/4O3 exhibits the highest ionic conductivity of 1.23 × 10−5 S cm−1 at 25°C. Additionally, a half cell of LiFePO4/Li performed well in charge–discharge experiments, retaining a discharge capacity of 87.9 mAhg−1 after 300 cycles when Li3/8Sr7/16Zr1/4Nb3/4O3 was selected as the solid electrolyte separator.
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The authors acknowledge the financial support provided by the National Natural Science Foundation of China (Grant Nos. 51834004, 51774076, 51704063, and 51474057). The first author is also thankful to Liaoning Key Laboratory for Metallurgical Sensor and Technology providing the facilities for the research.
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Lu, J., Li, Y. & Ding, Y. Structure and Conductivity of Li3/8Sr7/16−xAxZr1/4Nb3/4O3 (A = Ca, Ba) Li-ion Solid Electrolytes. JOM (2020). https://doi.org/10.1007/s11837-020-04239-9