We have studied the electrochemistry of the organosulfur compound, 4-amino-4H-1,2,4-triazole-3,5-dithiol (ATAD), as a potential cathode electroactive material for lithium-ion rechargeable batteries. The redox behavior was investigated via cyclic voltammetry, and the charge-transfer kinetics of ATAD were compared to those of 2,5-dimercapto-1,3,4-thiadiazole (DMcT) and thiophene-2,5bis (thiolate) (TBT). The redox reactions of ATAD were ascribed to the thiol groups at the 2 and 5 positions, forming a disulfide polymer during oxidation and cleaving the disulfide bonds during reduction. In addition to its chemical tunablity via the amine group, an important feature that DMcT does not possess, ATAD exhibited comparable charge-transfer kinetics to DMcT. Moreover, the charge-transfer kinetics of ATAD were significantly greater than those of TBT, which possesses chemically tunable points. These results point to the importance of heteroatoms adjacent to the thiolate groups to obtain fast charge-transfer kinetics. Furthermore, it was revealed that the redox reactions of ATAD could be accelerated by the conducting polymer poly (3,4-ethylenedioxythiophene). The chemical tunability of ATAD and the fast charge-transfer kinetics, as well as the high positive potential of the redox reactions, could enable the practical use of this organosulfur compound as a charge-storage material in lithium-ion rechargeable batteries. (C) 2007 The Electrochemical Society.