NOVELTY - An electrode comprises 1 or more conjugated organic ring-containing compounds (I)-(III), or at least one polymer comprising conjugated organic ring-containing compounds (I)-(III) as monomeric subunits. The compound includes cation chosen from protons, alkali metal cation, alkaline-earth metal cation, transition metal cation, rare-earth cation, organometallic cation and organic cation to ensure that the net charge of the compounds or monomeric subunits is zero.    USE - Electrode is used for electrical energy storage device e.g. secondary battery (all claimed) e.g. lithium-ion battery. Uses include but are not limited to mobile phone, laptop, tablet, digital camera, electric vehicle, and hybrid vehicle.    ADVANTAGE - The electrode provides secondary battery having high charge capacity, high operating voltage, high energy density and excellent cycle characteristics and conductivity.    DETAILED DESCRIPTION - An electrode comprises 1 or more conjugated organic ring-containing compounds of formula (I)-(III), or at least one polymer comprising conjugated organic ring-containing compounds (I)-(III) as monomeric subunits. The compound includes cation chosen from protons, alkali metal cation, alkaline-earth metal cation, transition metal cation, rare-earth cation, organometallic cation and organic cation to ensure that the net charge of the compounds or monomeric subunits is zero.    Cy=5- or 6-membered conjugated organic ring (optionally substituted by O, S, Se or N);    Q=group of formula (4)-(7);and    Z=O, N-CN or C(CN)2.    INDEPENDENT CLAIMS are included for the following:    (1) heteroaromatic compound chosen from compounds of formulae (8)-(15); and    (2) polymers, which consists of monomeric subunits.    R1-R4,R'2=H or substituent, preferably Br, I, organotin or boronic ester;    R'1=electron-withdrawing substituent chosen from F, Cl, CN, C(CN)2, nitro, fluorinated alkyl, heteroaryl, sulfonyl, acyl, carboxyl, carboxylic anhydride, amide, ester or carboxylic imide;and    X=S, SO, SO2 or O.