TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Compound: The ketone compound is of formula (1), preferably of formula (2 or 3).X=2-4C saturated bivalent residue or unsaturated hydrocarbyl (both optionally substituted by fluoro, cyano or (un)saturated hydrocarbyl optionally substituted by nitrogen, oxygen, sulfur or silicon), or H;R1,R2=H, fluoro or (un)saturated aliphatic group optionally substituted by halo, nitrogen, oxygen, sulfur atom or silicon;andR7-R10=1-4C alkyl, 2-4C alkenyl, 2-4C alkynyl, 3-6C cycloalkyl, 3-6C cycloalkenyl, aryl or aralkyl (all optionally substituted by fluoro, nitrogen, oxygen, sulfur or silicon), H, fluoro or cyano.R1 and R2 optionally combine to form ketone compound of formula (2A).R3-R6=1-4C alkyl, 2-4C alkenyl, 2-4C alkynyl, 3-6C cycloalkyl, 3-6C cycloalkenyl, aryl or aralkyl (all optionally substituted by fluoro, nitrogen, oxygen, sulfur or silicon), H, fluoro or cyano.Preferred Components: The electrode active material has two or more ketone compounds (1) coupled through aromatic ring. The aromatic ring is an aromatic ring derived from aromatic compound chosen from benzene, benzene derivative, thiophene, naphthalene, naphthalene derivative, anthracene, anthracene derivative, pyridine, fluorene and fluorene derivatives. The ketone compound is lithium salt of reduced form. Preferred Composition: The positive electrode contains the electrode active material, negative electrode contains negative electrode active material which occludes-discharges lithium ion, and electrolyte containing salt of lithium cation and anion. EXAMPLE - Ninhydrin and 1,2,3-indan trion were heat-processed at 300 degrees C in vacuum, to obtain positive electrode active material. The positive electrode containing the obtained positive electrode active material, negative electrode, and electrolyte containing propylene carbonate solution of lithium fluoride were arranged in glass-made cells, to obtain electrical storage device. The obtained electric storage device comprising electrode active material had high energy density and excellent charge-discharge cycle characteristics.