As defined in the Mukherjee application, ETMC is "an electroactive material having a reversible lithium insertion ability, wherein the transition metal is at least one selected from the group consisting of Ti, V, Cr, Mn, Fe, Nb, Mo, Ta, W, Co, Ni, Cu, Y, Zr, Ru, Rh, Pd, Hf, Re, Os, and Ir, and the chalcogenide is at least one selected from the group consisting of O, S, and Se. [read post]