Structural
peculiarities and electrochemical properties of R5M3
(R = La, Gd;
M = Ge, Sn) doped by lithium
Chem.
Met. Alloys 7 (2014) 106-111
https://doi.org/10.30970/cma7.0282
Andrij STETSKIV, Vasyl KORDAN, Ivan TARASIUK, Oksana ZELINSKA, Volodymyr PAVLYUK
Ternary phases R5LixM3 were prepared in two ways,
by melting and by electrochemical lithiation of the
binary compounds R5M3. They crystallize in the
hexagonal Hf5CuSn3 structure type, an ordered
superstructure of the Mn5Si3 type. Metallic type of
bonding was suggested by the analysis of the interatomic
distances and confirmed by electronic structure calculations. Electrochemical lithiation
reactions of electrodes made of R5M3 alloys were studied in an organic
electrolyte containing LiPF6 salt, using the conventional
charge-discharge technique, and the reaction products were analyzed by X-ray
powder diffraction. The partially lithiated phase, R5LixM3 (where x < 0.4), appears to be a solid solution
of Li in the initial structure of the binary compounds R5M3.
Projection
of the unit cell of Gd5Li0.4Sn3 and
coordination polyhedra of the atoms.
Keywords
Intermetallic compound / Crystal
structure / Rare-earth elements / Lithium / Electrochemistry