NOVELTY - The cell comprises a positive electrode (102) comprising sulfur compound, a negative electrode (101), a circuit (106) coupling the positive electrode with the negative electrode, an electrolyte medium, an interior wall of the cell, and an article comprising a hydrocarbon ionomer. The article is a porous separator (105). The hydrocarbon ionomer is incorporated as a surface coating on a surface of the article in an amount of 0.0001-100 mg/cm2, and is located in a pore wall of a pore in the porous separator and exposed to the electrolyte medium in a pore volume in the pore.    USE - The cell is useful in a portable battery and a power source for an electrified vehicle, an ignition system of a vehicle and a mobile device (claimed) such as cellular phone, camera and portable computing device, where the cell is a lithium-sulfur cell, and the electrified vehicle is electrified cars.    ADVANTAGE - The cell can be economically and safely manufactured with enhnaced maximum discharge capacity and coulombic efficiency.    DETAILED DESCRIPTION - The cell comprises a positive electrode (102) comprising sulfur compound, a negative electrode (101), a circuit (106) coupling the positive electrode with the negative electrode, an electrolyte medium, an interior wall of the cell, and an article comprising a hydrocarbon ionomer. The article is a porous separator (105). The hydrocarbon ionomer is incorporated as a surface coating on a surface of the article in an amount of 0.0001-100 mg/cm2, and is located in a pore wall of a pore in the porous separator and exposed to the electrolyte medium in a pore volume in the pore. The electrolyte medium is a lithium-containing cell solution comprising solvent and electrolyte. The article is a coating located on a surface of one of the porous separator, the negative electrode, the circuit or the interior wall of the cell. INDEPENDENT CLAIMS are included for:    (1) a method for making a cell; and    (2) a method for using a cell.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic two-dimensional perspective view of a cell.    Negative electrode (101)    Sulfur-containing positive electrode (102)    Circuit contact (104)    Porous separator (105)    Circuit. (106)