TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Electrode The sulfurous substance can be an inorganic or organic substance, which is at least one substance selected from (S)xm-, carbonsulfide represented by (SCS)n, 2-mercaptoethyl ether, 2-mercaptoethylsulfide, 1,2-ethanediol, tetrathioethylenediamine, N,N'-dithio- N,N'-dimethylethyleneamine, trithiocyanul acid, 2,4-dithiopyridine, 4,5--diamino- 2,6-dimethylmercapto-1,3,4-thiazole, compounds represented by general formulae (1), (2), (3), (4) and (5) and polymers of these. The electric conductive polymer substance can be a polythiophene having a repeat unit represented by general formula (I).R1, R2 = H, 1-4C alkyl group or can form a 1-4C alkylene, 1-2 cyclohexyne or o-xylylene by bonding to each otherAnother polythiophene compound is obtained by oxidization-polymerizing a thiophene compound represented by general formula (II). Another polythiophene compound has a repeat unit represented by general formula (III).R0 = -(CH)2-, -CH2CH(CH3)-, -CH2CH(C6H13)-, - CH2CH(C10H21)-, -CH2CH(C14H29-, -CH2CH(phenyl)-, -(CH2)3- , -CH2CH(CH2O(CH2)3SO3-Na+)-) or 6 other groupsThe polythiophene compound is derived from (E)-1,2-bis92-(3,4- ethylenedioxy)thienyl)vinylene, 1,4-bis(2-(3,4-ethylenedioxy)thienyl)benene, 4,4'- bis(2-(3,4-etylenedioxy)thienyl)biphenyl, 2,5-bis(2-(3,4-etylenedioxy)thienyl)fran, 2,5-bis(2-(3,4-etylenedioxy)thienyl)thiophene or 2,2':5',2-tert(3,4- ethylenedioxy)thiophene. The redox active film contains 1 - 15 wt% of electric conductive particles which are dispersed in a mixture of the sulfurous substance and the electric conductive polymer substance.Preferred Cell: The Li-secondary cell and the redox secondary cell are composed of an anode, an Li-type cathode, and an electrolyte layer placed between the anode and cathode. The Li-device and the redox- device comprise the anode composed of the redox reversible active electrode, a non- Li redox active cathode, and an electrolyte placed between the anode and the cathode, and it exhibits capacitor characteristics so that the charging voltage and/or cut-off voltage can be controlled. WIDER DISCLOSURE - A Li-secondary cell, a Li-device, a redox- secondary cell and a redox device comprise the invented redox active reversible electrode, which constitutes an anode.    EXAMPLE - An acetonitrile solution containing 3,4-ethylenedioxythiophene (EDOT) (20mM) and LiClO4 (0.1 M) was prepared. A PEDOT-coating electrode was prepared by conducting oxidation-polymerization in the acetonitrile solution functioning as an electrolyte using a triple-electrode cell comprising a carbon electrode, a Pt-electrode and an Ag ion electrode. The EDOT electrode exhibited a high charging current.