Cathode for metal-air battery, preparing method thereof, and metal-air battery comprising the same

A cathode for a metal-air battery, the cathode consisting of:

• a mixed conductor;
• and
• first pores having a size of about 1 micrometer or greater,
• wherein an amount of the first pores is about 30 volume percent or greater, with respect to a total volume of pores in the cathode, and
• a total porosity of the cathode is about 50 percent or greater, based on a total volume of the cathode,
• wherein the mixed conductor is a perovskite compound represented by Formula 5:
• LixAlyG1zO3−δ Formula 5
• wherein, in Formula 5,
• A1 is at least one of La, Ce, Pr, Gd, Ca, Sr, or Ba,
• G1 is at least one of Mn, Ru, Cr, Co, Ir, Fe, Pd, Pb, Rh, Sn, V, Re, Ge, W, Mo, Hf, or Bi, and 0.2<x≤0.5, 0.4<y≤0.6, 0<x+y<1, 0.8<z≤1.2, and 0≤δ≤0.4.

A cathode for a metal-air battery, the cathode comprising:

• a mixed conductor;
• and
• first pores having a size of about 1 micrometer or greater,
• wherein an amount of the first pores is about 30 volume percent to about 95 volume percent, with respect to a total volume of pores in the cathode, and
• a total porosity of the cathode is about 70 percent to about 95 percent, based on a total volume of the cathode,
• wherein the mixed conductor is a perovskite compound represented by Formula 5:
• LixAlyG1zO3−δ Formula 5
• wherein, in Formula 5,
• Al is at least one of La, Ce, Pr, Gd, Ca, Sr, or Ba,
• G1 is at least one of Mn, Ru, Cr, Co, Ir, Fe, Pd, Pb, Rh, Sn, V, Re, Ge, W, Mo, Hf, or Bi, and 0.2<x≤0.5, 0.4<y≤0.7, 0<x+y<1, 0.8<z≤1.2, and 0≤δ≤1, and
• wherein the cathode comprises about 70 parts to about 100 parts by weight of the mixed conductor, with respect to 100 parts by weight of the cathode.