Electrochemically-formed disordered rock salt compounds are an emerging class of Li-ion electrode materials for fast-charging energy storage. However, the specific factors that govern the formation process and the resulting charge storage performance are not well understood. Here, we characterize the transformation mechanism and charge storage properties of an electrochemically-formed disordered rock salt from V₉Mo₆O₄₀ (VMO). The crystal structure of VMO has similar motifs to that of α-V₂O₅, a well-studied analogue, but VMO has less mechanical flexibility due to additional corner-sharing octahedra in its structure. As a result, VMO undergoes a single-step transformation pathway, which we characterize through operando X-ray diffraction, and forms an unusual highly distorted lamellar microstructure, as we show with high-resolution transmission electron microscopy. The resulting Li_xVMO material shows fast charging and other electrochemical characteristics and performance typical of many nanomaterials, even though the material is composed of relatively large particles.

中文翻译：

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电化学形成的无序岩盐 ω-LixV9Mo6O40 作为快速充电的锂离子电极材料


电化学形成的无序岩盐化合物是一类新兴的用于快速充电储能的锂离子电极材料。然而，控制形成过程和由此产生的电荷存储性能的具体因素尚不清楚。在这里，我们表征了 V₉Mo₆O₄₀ （VMO） 电化学形成的无序岩盐的转变机制和电荷存储特性。VMO 的晶体结构与 α-V₂O₅ 的晶体结构具有相似的基序，这是一种经过充分研究的类似物，但由于 VMO 结构中额外的角共享八面体，因此机械柔韧性较低。结果，VMO 经历了一步转变途径，我们通过原位 X 射线折射对其进行表征，并形成不寻常的高度扭曲的层状微观结构，正如我们用高分辨率透射电子显微镜所示。所得的 Li_xVMO 材料显示出许多纳米材料典型的快速充电和其他电化学特性和性能，即使该材料由相对较大的颗粒组成。