ChemInform Abstract: Novel Lithium Chloride Suzuki Phases, Li6MCl8 (M: Fe,Co, Ni).

Abstract

ChemInform Abstract The title compounds have been prepared by fusion of the binary chlorides. The metastable Ni compound can only be prepared by quenching from about 560 rc C. The compounds are cubic, space group Fm3m, Z=4. Li6FeCl8 and Li6CoCl8 undergo a reversible phase transition at 275 and 355 rc C, respectively. The novel Suzuki phases are fast Li+ conductors at elevated temperatures (specific conductivities at 500 rc C: Li6FeCl8 = 1.4•10-1Ω-1 cm-1, Li6CoCl8 = 1.5•10-1, Li6NiCl8 = 6.9•10-2). The Raman spectra show the four group theoretically allowed modes as sharp scattering peaks, which are discussed in terms of the vibrational modes of this structure.

A High‐Voltage Solid State Electrolyte Based on Spinel‐Like Chloride Made of Low‐Cost and Abundant Resources

“…[40] As a phase of the Li 2 MX 4 family, the Li 2 CrCl 4 with cubic spinel structures was fabricated three decades ago and offered an attractive ionic conductivity of 63 mS cm −1 at 400 °C with a small activation energy of 0.25 eV. [41,42] However, its RT conductivity was very poor due to phase transition into a different structure. Here in this work, we first attempted to stabilize the spinel phase of Li 2 CrCl 4 further, under the guidance of systematic DFT simulation to identify a more stable Li 2 Cr 2/3 Cl 4 phase with reduced amount of Cr owing to increased valency of the M site from 2+ into 3+.…”