Primary alkaline battery with integrated in-cell resistances
View Patent ↗The invention is directed toward a primary AA alkaline battery. The primary AA alkaline battery includes an anode; a cathode; an electrolyte; and a separator between the anode and the cathode. The anode includes an electrochemically active anode material. The cathode includes an electrochemically active cathode material. The electrolyte includes potassium hydroxide. The primary AA alkaline battery has an integrated in-cell ionic resistance (R i ) at 22° C. of less than about 39 mΩ. The electrochemically active cathode material includes electrolytic manganese dioxide. The electrolytic manganese dioxide has a specific cathode loading from about 2.9 g/cm 3 to about 3.45 g/cm 3 . The separator has a porosity of greater than 75%.
1. A primary AA alkaline battery comprising:
an anode, the anode comprising an electrochemically active anode material;
a cathode, the cathode comprising an electrochemically active cathode material;
an electrolyte, the electrolyte comprising potassium hydroxide; and
a separator therebetween the anode and the cathode; and
an integrated in-cell ionic resistance (R i ) at 22° C. of less than about 39 mΩ;
wherein the electrochemically active cathode material comprises electrolytic manganese dioxide, the electrolytic manganese dioxide having a specific cathode loading from about 2.9 g/cm 3 to about 3.45 g/cm 3 ; the separator has a porosity of greater than 75%.
2. The primary AA alkaline battery of claim 1 , the primary AA alkaline battery further comprising an integrated in-cell electronic resistance (R e ) at 22° C. of less than about 22 mΩ.
3. The primary AA alkaline battery of claim 1 , the primary AA alkaline battery further comprising an ohmic resistance (R t ) at 22° C. of less than about 57 mΩ.
4. The primary AA alkaline battery of claim 1 , the electrolytic manganese dioxide having a BET surface area from about 22 m 2 /g to about 32 m 2 /g.
5. The primary AA alkaline battery of claim 1 , the cathode comprising a carbon additive, the carbon additive comprising from about 3.25 weight percent to about 4.25 weight percent of the cathode.
6. The primary AA alkaline battery of claim 1 , the separator comprising a density from about 1.33 g/cm 3 to about 1.37 g/cm 3 .
7. The primary AA alkaline battery of claim 1 , the electrochemically active anode material comprising zinc, the zinc having a particle size from about 10 μm to about 300 μm.
8. The primary AA alkaline battery of claim 7 , the zinc having a BET surface area from about 0.045 m 2 /g to about 0.055 m 2 /g.