Abstract
The electrochemical lithiation of a new layered quaternary sulphide of Hg 0.76Ga 1.27In 1.44S 5 average composition having substantial structural identity to Zn 2In 2S 5 was investigated. The discharge behaviour in lithium cells with 1M LiClO 4 solution in propylene carbonate/dimethoxyethane (1:1) was examined by means of galvanostatic measurements. The discharge curves showed a continuous voltage decrease as no plateaux were observed, and the performance was superior to that of a similar layered compound, previously analyzed, CdIn 2S 2Se 2. Due to lithium discharge, the X-ray diffraction spectrum of the cathode pellet changed, above all the relative peak intensities, and such behaviour was partly related to the typical defective structure of the sulphide having a highly disordered cation sublattice. Thermogravimetric analyses, differential scanning calorimetry, morphological and structural measurements were also carried out on the original compound in order to better characterize this new material.
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