Lithium-sulfur battery

A lithium-sulfur battery, comprising:

• a positive electrode;
• a negative electrode;
• and
• a separator and an electrolyte interposed between the positive and negative electrodes,
• wherein the positive electrode, the negative electrode or the positive and negative electrode contacts the separator and comprises a passivation film having a semi-interpenetrating polymer network (semi-IPN) structure formed by one or more polymers selected from the group consisting of a cross-linked copolymer, which comprises a repeating unit represented by the following Formula 1 and a repeating unit represented by the following Formula 2;
• and a polyalkylene glycol and a polyacrylamide as linear polymers:
• wherein R1 and R2 are the same or different from each other, and each independently hydrogen, or a C1 to C10 alkyl group, and R3 and R4 are each independently an alkali metal;
• and
• wherein R5 to R8 are the same or different from each other, and each independently hydrogen, a C1 to C30 alkyl group, a C6 to C30 aryl group, or a C1 to C30 alkoxy group.