Cathode active material for electrochemical cell - comprises a mixed heavy metal polysulphide

摘要

Cell cathode active material comprises one or more heavy metal polysulphides M'wM"x(Sy)z where M' and M" are different heavy metals, nw+mx = 22 n and m are valence states of M' and M"; and y is greater than 4.5. Pref. M' and M" are Cu, V, Mo, Fe or Co; the cell anode is pref. an alkali(ne earth) metal esp. Li.