Preparation of iron disulfide and its use for lithium batteries

Several iron disulfide samples were synthesized by the reaction of FeCl2 or Fe2O3 with H2S, and their utilities were evaluated as a cathode active material in lithium cells. As a result, it was found that the Li/synthesized FeS2 cells have high working plateau voltages and extremely high cathode efficiencies, compared with the Li/natural pyrite cells. Such improved discharge characteristics of the Li/synthesized FeS2 cells were explained on the basis of the difference in particle or surface area between synthesized FeS2 and natural pyrite samples.