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The effect of Fe addition on the cycle performance of FeS2cathode for Li/FeS2cell was investigated. After cathode fabrication, additional compounds were not formed. In the case of Li/FeS2 cell without Fe, a large voltage drop was observed at initial discharge process. Also, the cell showed poor cycle performance until the 40th cycle. On the other hand, the Li/FeS2 cell with 10wt.% Fe delivered a higher the 1st discharge capacity of about 670mAh/g-FeS2 and it exhibited better cycle performance than the cell without Fe. Moreover, rate capability of the cell was improved by the addition of Fe in the FeS2cathode.