Kenichi Yokoyama

Preparation of iron sulfides and the study of their electrochemical characteristics for use in a nonaqueous—lithium battery

Abstract A variety of iron sulfides was prepared by changing both the mixing ratio of iron to sulfur and the reaction heating temperatures. Samples were then subjected to chemical and X-ray diffraction analyses to check their composition. These iron sulfides were polarized in a nonaqueous electrolyte. As a result, the sample prepared with a S/Fe ratio of 1.1/1 and heated at 800 °C showed the highest electrochemical capacity and had the molecular formula FeS. A button-type, nonaqueous electrolyte—lithium battery using the FeS as the cathode material was constructed and evaluated. The energy density of the battery was calculated to be 0.448 W h/cm 3 and 0.137 W h/g.