التفاصيل البيبلوغرافية
| العنوان: |
Effect of rare earth ytterbium (RE-Yb3+) ions on structure and electrical properties of the Li1+xTi2−xYbx(PO4)3 (0 ≤ x ≤ 0.3) NASICON series. |
| المؤلفون: |
Kahlaoui, Radhouene, Hassen, Rached Ben, Sobrados, Isabel, Jimenez, Ricardo, Ternane, Riadh, Sanz, Jesus |
| المصدر: |
Ionics; May2024, Vol. 30 Issue 5, p2517-2536, 20p |
| مستخلص: |
Li1+xTi2−xYbx(PO4)3 (0 ≤ x ≤ 0.3) materials were prepared via a conventional solid-state reaction and characterised via powder X-ray diffraction (XRD), scanning electron microscopy (SEM), nuclear magnetic resonance (NMR) and electrochemical impedance spectroscopy (EIS). The substitution of Ti4+ by Yb3+ in LiTi2(PO4)3 increases unit cell parameters and the amount of lithium in NASICON phase (S.G. R 3 ¯ c), but its incorporation is limited to 0.24/formula. The partial substitution of titanium by ytterbium enlarges diffusion channels and increases Li+ ion mobility in Li1+xTi2−xYbx(PO4)3 (0 ≤ x ≤ 0.3) series. Li–Li repulsion favours the allocation of lithium at M3 (0.07, 0.34, 0.07) at the expense of M1 (0,0,0) sites in the NASICON structure, increasing Li+ ion conductivity. The presence of paramagnetic Yb3+ ions causes severe broadening of NMR signals which precludes structural analyses. Among the investigated samples, Li1.2Ti1.8Yb0.2(PO4)3 showed the best "bulk" conductivity (1.98 × 10−3 S.cm−1 at room temperature) and a lower activation energy (Ea = 0.29 eV). The increment of ceramic pellet density decreased the grain-boundary resistance, improving transport properties. In particular, the "overall" conductivity at room temperature increased from 1.18 × 10−7 (Ea = 0.45 eV) in LiTi2(PO4)3 to 1.01 × 10−5 S.cm−1 (Ea = 0.33 eV) in Li1.2Ti1.8Yb0.2(PO4)3. The stability of NASICON phases and the small amount of secondary phases make x = 0.2 sample a good candidate for solid electrolytes in all solid-state batteries (ASSBs). In these samples, "overall" conductivity is conditioned by "core–shell" structures, where external shells are enriched in Yb and Li ions. Above x = 0.2, the formation of secondary YbPO4 and LiTiPO5 phases at the NASICON particle surface decreased "overall" conductivity. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
Complementary Index |
