Composite diaphragms for zinc secondary batteries and zinc secondary batteries

A zinc secondary battery, comprising:

• an electric core and a composite diaphragm for the zinc secondary battery, wherein
• the composite diaphragm is wrapped around a periphery of the electric core, and
• the composite diaphragm includes a base diaphragm and a conductive film for the zinc secondary battery, the conductive film being connected to one end of the base diaphragm, wherein the conductive film for the zinc secondary battery includes a porous polymer film, a pore size of the porous polymer film is within a range of 100 nm to 800 nm, and pores of the porous polymer film are filled with conductive compositions, a mass ratio of the porous polymer film and the conductive compositions is 1:0.02-0.2, the conductive compositions including 1-10 parts by weight of a conductive agent and 0.1-1 part by weight of an additive;
• wherein
• the conductive agent includes at least one of graphite, conductive carbon black, acetylene black, or a graphene carbon nanotube;
• and
• the additive is formed by mixing a first additive and a second additive in a mass ratio of 1-5:0.2-3;
• wherein the first additive is at least one of a tin powder, a bismuth powder, an indium powder, a lead powder, and a cadmium powder, and the second additive is at least one of the tin dioxide powder, the bismuth oxide powder, an indium oxide powder, a lead oxide powder, and a cadmium oxide powder.

A zinc secondary battery, comprising:

• a shell and an electric core disposed in the shell, wherein an inner wall of the shell is fitted with a composite diaphragm for a zinc secondary battery, the composite diaphragm comprising:
• a base diaphragm and a conductive film for the zinc secondary battery, the conductive film being connected to one end of the base diaphragm, wherein the conductive film for the zinc secondary battery includes a porous polymer film, a pore size of the porous polymer film is within a range of 100 nanometers (nm) to 800 nm, and pores of the porous polymer film are filled with conductive compositions, a mass ratio of the porous polymer film and the conductive compositions is 1:0.02-0.2, the conductive compositions including 1-10 parts by weight of a conductive agent and 0.1-1 part by weight of an additive;
• wherein
• the conductive agent includes at least one of graphite, conductive carbon black, acetylene black, or a graphene carbon nanotube;
• and
• the additive is formed by mixing a first additive and a second additive in a mass ratio of 1-5:0.2-3;
• wherein the first additive is at least one of a tin powder, a bismuth powder, an indium powder, a lead powder, and a cadmium powder, and the second additive is at least one of the tin dioxide powder, the bismuth oxide powder, an indium oxide powder, a lead oxide powder, and a cadmium oxide powder.