Intensively growing Li-ion battery research area place high demands in the establishing of the long- and short-range structure of the electrodes after or during Li intercaltion. Low crystallinity of the electrode materials and weak scattering of the X-rays by Li atoms make these systems crystallographically chalenging. To understand the processeses occurring in tin pnictides electrodes we have synthesized ternary Li-Sn-Pn (Pn = P, As) compounds. We hypotesize that the formation of Li1�xSn3+xPn2 is the first stage of Li intercalation into Sn4Pn3. To fully characterize the long-range and local structure were applied a combination of powder and single crystal X-ray diffraction, 7Li NMR and 119Sn M�ssbauer spectroscopies, as well as high resolution TEM. Observed local ordering of Sn and Li atoms was further probed by quantum-chemical calculations which indicate strong anisotropy of the properties of Li1�xSn3+xPn2. Investigation of the resistivity and thermal conductivity performed on the large single crystals confirmed anisotropic transport properties of Li1�xSn3+xPn2.

Li1�xSn2+xPn2 (Pn = P, As): Novel layered Li compounds

247th National Meeting (2014)

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