Manganese dry battery containing an anode zinc can made of zinc and bismuth
A virtually lead additive-free but highly reliable and practical anode zinc can for a battery with improved process-ability and corrosion resistance. A manganese dry battery comprising such a zinc can. A manufacturing method for making the zinc can and a battery.
1. A manganese dry battery comprising:
an anode zinc can with a covered bottom and a cylindrical can wall made from an anode active material which comprises:
98.7 percent by mass or more and 99.8 percent by mass or less of zinc,
0.01 percent by mass or more and 0.7 percent by mass or less of bismuth,
1 ppm or less of antimony,
70 ppm or less of lead,
20 ppm or less of cadmium;
wherein the anode zinc can structure in a cross section of said can wall being cut in a height and thickness direction consists of crystals of 8 μm or more and 25 μm or less of average grain diameter as measured on a projected image of the crystals on a horizontal line in the thickness direction; wherein crystal grain diameter at the outer wall of the zinc can is 1.0 to 1.4 times the crystal grain diameter at the inner wall; and wherein the zinc can is produced by deep drawing a pellet of the anode active material at a temperature ranging from 120 to 210° C.
2. The manganese dry battery of claim 1 , further comprising:
natural manganese dioxide as a cathode active material.
3. The manganese dry battery of claim 1 further comprising:
electrolytic manganese dioxide as a cathode active material.
4. The manganese dry battery according to claim 1 , wherein the anode active material further comprises from 0.0003 percent by mass to 0.003 percent by mass of magnesium.
5. The manganese dry battery according to claim 2 , wherein the anode active material further comprises from 0.0003 percent by mass to 0.003 percent by mass of magnesium.
6. The manganese dry battery according to claim 3 , wherein the anode active material further comprises from 0.0003 percent by mass to 0.003 percent by mass of magnesium.
7. The manganese dry battery of claim 1 , wherein said anode zinc can is made of a zinc alloy that further comprises from 0.0003 percent by mass to 0.003 percent by mass of magnesium.
8. The manganese dry battery of claim 1 , wherein said anode zinc can is made of a zinc alloy that further comprises more than or equal to 0.001 percent by mass and less than or equal to 0.05% by mass of at least one element selected from the group consisting of zirconium, strontium, barium, indium, and aluminum.
9. A manganese dry battery comprising:
a cathode comprising an active material containing manganese,
an electrolyte containing zinc chloride and ammonium chloride, and
an anode that is a zinc can with a covered bottom and a cylindrical can wall made from an anode active material which comprises:
98.7 percent by mass or more and 99.8 percent by mass or less of zinc,
0.01 percent by mass or more and 0.7 percent by mass or less of bismuth,
1 ppm or less of antimony,
70 ppm or less of lead,
20 ppm or less of cadmium;
wherein the zinc can wall when cut longitudinally produces a cross-section made up of crystals having an average grain diameter ranging from 8 μm to 25 μm; wherein crystal grain diameter at the outer wall of the zinc can is 1.0 to 1.4 times the crystal grain diameter at the inner wall; and wherein the zinc can is produced by deep drawing a pellet of the anode active material at a temperature ranging from 120 to 210° C.
10. The manganese dry battery of claim 9 ,
wherein said zinc can surrounds the separator, cathode and a carbon rod current collector.
11. The manganese dry battery of claim 9 ,
wherein said zinc can is surrounded by an insulation tube and an outer can.