CATALYST FOR AIR ELECTRODES, AIR ELECTRODE AND METAL AIR SECONDARY BATTERY
A catalyst for an air electrode of a metal air secondary battery, the catalyst containing Ca 2 FeCoO 5 and YBaCo 4 O 7 , in which a mass ratio of a content of the YBaCo 4 O 7 to a content of the Ca 2 FeCoO 5 is 0.49 to 9.00.
1 . A catalyst for an air electrode of a metal air secondary battery, the catalyst comprising:
Ca 2 FeCoO 5 ; and
YBaCo 4 O 7 ,
wherein a mass ratio of a content of the YBaCo 4 O 7 to a content of the Ca 2 FeCoO 5 is 0.49 to 9.00.
2 . An air electrode used in a metal air secondary battery, the air electrode comprising:
a catalyst layer comprising the catalyst according to claim 1 , and
a conductive carbon material.
3 . The air electrode according to claim 2 , further comprising a gas diffusion layer having conductivity.
4 . A metal air secondary battery comprising:
the air electrode according to claim 2 ;
a negative electrode; and
an electrolyte.
5 . A metal air secondary battery comprising:
the air electrode according to claim 3 ;
a negative electrode; and
an electrolyte.
6 . The catalyst according to claim 1 ,
wherein the mass ratio of a content of the YBaCo 4 O 7 to a content of the Ca 2 FeCoO 5 is 2.00 to 4.00.
7 . An air electrode used in a metal air secondary battery, the air electrode comprising:
a catalyst layer comprising the catalyst according to claim 6 ; and
a conductive carbon material.
8 . The air electrode according to claim 7 , further comprising a gas diffusion layer having conductivity.
9 . A metal air secondary battery comprising:
the air electrode according to claim 7 ;
a negative electrode; and
an electrolyte.
10 . A metal air secondary battery comprising:
the air electrode according to claim 8 ;
a negative electrode; and
an electrolyte.