Abstract
Cubic Ag 4Hf 3S 8 treated with n-butyl lithium was found to function as the cathode in a lithium cell. The structure model of cubic lithiated Ag 4Hf 3S 8 was reconstructed on the basis of Rietveld analysis of XRD data. Its space group was assumed to be identical with that of the source, P4 332 . It was clarified that XRD profiles of lithiated phase can be well explained by the presence of a rigid framework structure of Hf 3S 8 not broken by lithium. Comparative studies on electrochemical lithium insertion into Ag 4Hf 3S 8 were carried out in non-aqueous organic solvents. The electrochemical behavior and structural change of Ag 4Hf 3S 8 cathode were investigated. Effect of electrolytes on discharge behavior was examined for solutions, such as (1) 1 M LiI, (2) 1 M LiClO 4 and (3) 1 M LiPF 6 in propylene carbonate (PC). The initial cell voltage was found to differ with the electrolyte used: 2.4 V for case (1), 2.4 V for case (2) and 3.0 V for case (3).
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