Abstract
Electrochemical and chemical lithium insertion (vian-butyllithium) were carried out on a family of spinel phases of the Cu2S-In2S3-SnS2 system. Electrochemical measurements have revealed great reversible capacities and the possible use of these materials as negative electrodes in lithium-ion batteries.119Sn Mossbauer spectroscopy,7Li NMR and S K edge EXAFS spectroscopy were carried out to characterize the mechanisms of lithium insertion. This study has shown the formation of lithium-metal alloys finely dispersed in an amorphous lithium sulfide matrix at low potentials. A model is proposed to explain the great capacities observed in these materials.
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