Li-intercalation compounds are a class of materials that have generated much interest for use in Li-ion batteries as electrode materials and ionic conductors in solid-state electrolytes. Herein we report the synthesis and structural and electronic characterization of the novel Li-intercalation compound, Li1-xSn2+xAs2 (0.2 = x = 0.4). The crystal structure of Li1-xSn2+xAs2 can be described as an analog of a hypothetical binary compound Sn3As2, which is similar to the binary pnictide, Sn4As3. Sn3As2 consists of alternating layers of Sn and As atoms that are combined in 5-atom thick blocks that stack along the c-axis. Similarly, the crystal structure of Sn4As3 has 7-atom thick blocks stacked along the c-axis. The crystal structure of Li1-xSn2+xAs2 is similar to Sn3As2, but a portion of the Sn atoms in the central layer is randomly substituted with Li atoms. M�ssbauer spectroscopy confirms the presence of two types of Sn atoms. 7Li solid-state NMR spectroscopy indicates possible local ordering of the Li and Sn atoms. Li1-xSn2+xAs2 exhibits a homogeneity range and variation in unit cell volume with varying Li content. The metallic properties and anisotropic electrical resistivity are supported by the anisotropic crystal structure and quantum chemical calculations. Further electronic, magnetic, and electrochemical properties of this compound will be discussed.

Synthesis, crystal structure, and transport properties of a new Li-containing layered material, Li1-xSn2+xAs2

248th National Meeting (2014)

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