We carried out a detailed investigation of the local ordering and dynamics of the lithium intercalation in paramagnetic Li_xVOPO₄.2H₂O (with 0 < x ≤ 1) materials.

This question was addressed using a combination of X-ray diffraction, ³¹P and ⁷Li MAS NMR experiments. We first studied the structure of the fully ordered end-member of the series, Li₁VOPO₄.2H₂O, revisiting the X-ray single crystal diffraction data on the basis of the information provided by ³¹P MAS NMR. We then carried out ⁷Li MAS and exchange NMR experiments and ³¹P MAS experiments on the polycrystalline powders obtained after partial lithium insertion in VOPO₄.2H₂O phases. These experiments evidenced an unexpected ageing of the material related with lithium dynamics between the VOPO₄ layers and a V⁴⁺/V⁵⁺ charge ordering mechanism within the layers.

我们进行了锂嵌入在顺磁性Li的局部有序和动力学的详细调查_X VOPO ₄ ·2H ₂ O（0 <X≤1）的材料。

通过结合X射线衍射，³¹ P和⁷ Li MAS NMR实验解决了这个问题。我们首先研究了一系列的完全有序端构件的结构中，李₁ VOPO ₄ ·2H ₂ O，重新考虑提供的信息的基础上，X射线单晶衍射数据³¹ P MAS NMR。然后，我们进行了^7个栗MAS和交换NMR实验和^31个上在VOPO局部锂插入后所得的多晶粉末P MAS实验₄ ·2H ₂O相。这些实验证明了与VOPO ₄层之间的锂动力学以及层内的V ⁴⁺ / V ⁵⁺电荷有序机制有关的材料的意外老化。