Alkali Metals Extraction Reactions with the Silicides Li15Si4 and Li3NaSi6: Amorphous Si versus allo-Si

作者: Michael Zeilinger , Laura-Alice Jantke , Lavinia M. Scherf , Florian J. Kiefer , Gero Neubüser

DOI: 10.1021/CM503371E

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摘要: The silicides Li15Si4 and Li3NaSi6 were subjected to chemical extraction of the alkali metal component by liquid ammonia ethanol, respectively, which after washing yielded black powders amorphous silicon. investigated reactions are interesting with respect both formation novel Si modifications delithiation process in anode materials. products termed a-Si (from Li15Si4) a-allo-Si Li3NaSi6) characterized a combination methodologies (X-ray diffraction, transmission electron microscopy, differential thermal analysis, Raman, atomic absorption, energy-dispersive X-ray spectroscopy) revealed (i) porous microstructure for built from spherically shaped particles sizes around 10 nm, (ii) partial surface oxidation materials (iii) presence nanocrystalline result protic is at variance earlier findings reporting crystalline bulk allotrope sil...

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