A FeOCl derivative was prepared from FeOCl intercalated by 2,2-bithiophene (Bth). This product shows an X-ray diffraction pattern similar to gamma-FeOOH and contains the organic substances originating from Bth. Thus we conclude that the product resulting by the means of reaction is "FeOOH including Bth". As a result of the galvanostatic discharge-charge cycling test, it was revealed that the specific discharge capacity of FeOOH including Bth was 80 mAh . g(-1) at 10th discharge.