Cathode, lithium-air battery including the same, and method of preparing the same

A method of preparing a cathode, the method comprising:

• providing a suspension comprising a lithium-containing metal oxide particle;
• and
• electrophoretically depositing the lithium-containing metal oxide particle on a porous electrically conductive framework substrate to prepare the cathode,
• wherein an areal resistance of the porous electrically conductive framework substrate is about 0.01 milliohms per square centimeter to about 100 milliohms per square centimeter.

A cathode configured to use oxygen as a cathode active material, the cathode comprising:

• a porous electrically conductive framework substrate;
• and
• a coating layer disposed on a surface of the porous electrically conductive framework substrate,
• wherein the coating layer comprises at least one of a perovskite compound represented by Formula 1, a spinel compound represented by Formula 2, or a spinel compound represented by Formula 3:
• LixAyGzO3−δ Formula 1
• wherein, in Formula 1,
• A and G are each independently at least one of a Group 2 to Group 16 element;
• and
• 0<x<1, 0<y<1, 0<(x+y)≤1, 0<z≤1.5, and 0≤δ≤1.5,
• Li1±xM2±yO4−δ1 Formula 2
• Li4±aM5±bO12−δ2 Formula 3
• wherein, in Formulae 2 and 3,
• each M is independently selected and is at least one of a Group 2 to Group 16 element;
• and
• 0<x<1, 0<y<1, 0≤δ1≤1, 0<a<2, 0.3<b<5, and 0≤δ2≤3.