Cathode electrode, manufacturing method thereof and lithium sulfur battery using the same

A lithium sulfur battery comprising a cathode electrode, wherein the cathode electrode comprises, a current collector;

• and a cathode electrode active material layer laminated on the current collector, the cathode electrode active material comprising particles having a core-shell structure with a sulfur-containing active material core, a conductor coating disposed on a surface of the active material core, and a binder coating disposed on the conductor coating.

A method for manufacturing a cathode electrode comprising:

• (a) mixing 2 to 100 parts by weight of a sulfur-containing cathode active material, 1 to 50 parts by weight of a conductive material with 20 to 100 parts by weight of a solvent and milling to prepare primary particles of the cathode active material including a cathode active material core and a conductor coating disposed on the cathode active material core;
• and
• (b) mixing a binder solution comprising 0.1 to 50 parts by weight of a binder dissolved in 1 to 99.9 parts by weight of a solvent, with the primary particles of the cathode active material and milling to prepare a slurry of secondary particles of the cathode active material including a binder coating.