NOVELTY - The electrode (100) comprises a sulfur-based active material, an electronically conducting agent, and a solid polymer electrolyte (130). The active material, the conducting agent, and the electrolyte are all mixed together to form an electrode active film (110) comprising 50-80% of sulfur. The cathode electrode is used with an anode electrode comprising lithium metal. The electrode further comprises a current collector (140) adjacent to the electrode active film. The solid polymer electrolyte comprises a diblock copolymer or a triblock copolymer, and a lithium salt.    USE - The electrode is useful in an electrochemical cell (claimed) and lithium-ion battery, where the electrochemical cell is useful in cellular phones, laptop computers and other consumer electronic products, and the lithium-ion battery is useful in defense, aerospace, back-up storage and transportation applications.    ADVANTAGE - The electrode can be efficiently and economically manufactured with long life, high energy and power densities and reduced weight and volume and without capacity fade.    DETAILED DESCRIPTION - The electrode (100) comprises a sulfur-based active material, an electronically conducting agent, and a solid polymer electrolyte (130). The active material, the conducting agent, and the electrolyte are all mixed together to form an electrode active film (110) comprising 50-80% of sulfur. The cathode electrode is used with an anode electrode comprising lithium metal. The electrode further comprises a current collector (140) adjacent to the electrode active film. The solid polymer electrolyte comprises a diblock copolymer or a triblock copolymer, and a lithium salt. An ionically-conductive first block of the block copolymer comprises an ionically-conductive comb polymer comprising a backbone and pendant groups.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of a conventional electrode for an electrochemical cell.    Electrode assembly (100)    Electrode film (110)    Electrode active material particles (120)    Solid polymer electrolyte (130)    Current collector. (140)