Ag3V2(PO4)2F3, a new compound obtained by Ag+/Na+ ion exchange into the Na3V2(PO4)2F3 framework†,Journal of Materials Chemistry A

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Ag3V2(PO4)2F3, a new compound obtained by Ag+/Na+ ion exchange into the Na3V2(PO4)2F3 framework†
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2018-04-24 00:00:00 , DOI: 10.1039/c8ta01095a
M. Bianchini _{1,

2,

3,

4,

5} , F. Lalère _{1,

2,

3,

4,

5} , H. B. L. Nguyen _{1,

2,

3,

4,

5} , F. Fauth _{6,

7,

8} , R. David _{1,

2,

3,

4,

5} , E. Suard _{5,

9,

10} , L. Croguennec _{11,

12,

13,

14,

15} , C. Masquelier _{1,

2,

3,

4,

5}

Affiliation

Phosphate polyanionic compounds have been used for several technological applications and are especially widespread in battery research. Na₃V₂(PO₄)₂F₃ is a material that holds great promise as a positive electrode for Na-ion batteries. We study here the Ag⁺/Na⁺ ion exchange that is possible due to the high ionic mobility of Na⁺ in this material. A nearly complete ion exchange was obtained and we report the crystal structure of the new orthorhombic phase Ag₃V₂(PO₄)₂F₃, determined by synchrotron X-ray and neutron powder diffraction. Silver occupies the same crystallographic sites as sodium and, except for the differences caused by steric effects, Ag₃V₂(PO₄)₂F₃ preserves the symmetry constraints already present in the parent compound Na₃V₂(PO₄)₂F₃. We also followed the evolution of the crystal structure upon heating/cooling, to observe an order/disorder transition analogous to the one already reported for Na₃V₂(PO₄)₂F₃, but occurring at a significantly higher temperature.

中文翻译：

Ag ₃ V ₂（PO ₄）₂ F ₃，通过将Ag ⁺ / Na ⁺离子交换成Na ₃ V ₂（PO ₄）₂ F ₃骨架而获得的新化合物†

磷酸盐聚阴离子化合物已用于多种技术应用，并且在电池研究中尤其广泛。Na ₃ V ₂（PO ₄）₂ F ₃是作为钠离子电池的正极材料具有广阔前景的材料。我们在这里研究了由于该材料中Na ⁺的高离子迁移率而可能进行的Ag ⁺ / Na ⁺离子交换。获得了几乎完全的离子交换，并且我们报告了新的正交相Ag ₃ V ₂（PO ₄）₂ F ₃的晶体结构。，由同步加速器X射线和中子粉末衍射确定。银与钠具有相同的晶体学位点，除了空间效应引起的差异外，Ag ₃ V ₂（PO ₄）₂ F ₃保留了母体化合物Na ₃ V ₂（PO ₄）₂ F中已经存在的对称性约束。₃。我们还跟踪了加热/冷却后晶体结构的演变，以观察到类似于已报道的Na ₃ V ₂（PO ₄）₂ F ₃的有序/无序转变。，但发生在明显更高的温度下。

更新日期：2018-04-24

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