Structural and Local Environment Modifications in a Chemically Lithiated Iron Thiospinel

Structural Modifications and Electrochemical Behavior of Lithium-Inserted In16Fe8S32

“…Similar behavior has been observed chemical lithium insertion (8). the Mo¨ssbauer results showing no reduction of Fe>, seems to indicate that the incoming electrons during the insertion process do not cause a net reduction of cations but an increase in covalency of the network (as deduced from Fe Mo¨ssbauer spectroscopy), the electrons being incorporated into the delocalized band structure.…”

“…Since these sites are close to each other (8a to 16c and 8b to 16d), an increase in electrostatic repulsions is expected. Other different cation distributions are possible, as we have recently shown (8), by occupying simultaneously 8a, 8b, 16c, and 16d sites. In all cases, the cations can be redistributed to minimize the repulsive interactions up to 8 Li/mol.…”

“…A powdered sample of In Fe S was prepared as described elsewhere (8). Electrochemical lithium insertion was carried out at room temperature in two-electrode test cells using the indium, iron thiospinel as cathode, lithium metal foil as anode, and 1 M solution of LiClO in propylene carbonate as electrolyte, supported by porous glass-paper disks.…”

“…1). Comparison of the isomer shift with the chemically lithiated product allows us to ascribe it to a tetrahedral 8b site (8). It is worth noting that at 8 Li/mol, the 8a site is full and the 16c site has an occupancy factor of 0.5 (assuming that Li are placed in 16c).…”

Investigation of cation-deficient quaternary thiospinels: single crystal study of Ag1.4Cr1.47Sn2.53S8

“…However, there are very few reports on silver-based spinels. Among these, Ag 0.5 In 2.5 S 4 has been previously studied as a host lattice for lithium insertion by both chemical and electrochemical methods [13]. The quaternary silver-based spinel Ag 2 FeSn 3 S 8 has been earlier reported in the literature [14] and is isostructural with the copper analogue, Cu 2 FeSn 3 S 8 [15].…”