Cathode catalyst for metal-air battery, method for manufacturing same, and metal-air battery comprising same

1) Preparation of Cathode Catalyst

[0065]Lanthanum nitrate, calcium nitrate, and nickel nitrate were chosen as starting materials. The starting materials were measured and prepared in the molar ratio of 1.9:0.1:1 for La:Ca:Ni. Then, the starting materials were dissolved in ethylene glycol and distilled water and citric acid was then added, thereby forming a sol. Here, 10 parts by weight of the ethylene glycol were added with respect to 100 parts by weight of the distilled water, and the amount of citric acid added was three times the total number of moles of all the starting materials. The solution was heated at 70° C. to form the gel. The gel was kept heated and was pyrolized at 250° C. Subsequently, thermal treatment was performed at 900° C. for five hours, thereby forming a catalyst. The catalyst was cooled and crashed in the furnace.

2) Preparation of Cathode

[0066]The formed cathode catalyst, carbon black (Ketjen Black), conductor carbon (Super-P), and PTFE binder were mixed in the w

[0069]A cathode catalyst, a cathode plate, and a metal-air battery were prepared in the same method as in embodiment 1 except that the molar ratio of La, Sr, and Ni is 1.9:0.1:1.

[0070]A cathode catalyst, a cathode plate, and a metal-air battery were prepared in the same method as in embodiment 1 except that the molar ratio of La, Sr, and Ni is 1.7:0.3:1.