Positive electrode for alkaline battery and alkaline battery using the same
View Patent ↗A positive electrode for an alkaline battery of the present invention includes a spinel-type manganese oxide as a positive electrode active material, wherein the spinel-type manganese oxide has a potential of 0.26 to 0.34 V with respect to a Hg/HgO reference electrode, and the content of the spinel-type manganese oxide in the entire positive electrode active material is not less than 30 mass %. Further, an alkaline battery of the present invention includes the above-described positive electrode for an alkaline battery of the invention, a negative electrode and an electrolyte.
1. A positive electrode for an alkaline battery comprising a spinel-type manganese oxide as a positive electrode active material,
wherein the spinel-type manganese oxide has a potential of 0.26 to 0.34 V with respect to a Hg/HgO reference electrode, and
the content of the spinel-type manganese oxide in the entire positive electrode active material is not less than 60 mass %.
2. The positive electrode for an alkaline battery according to claim 1 , further comprising
electrolytic manganese dioxide as a positive electrode active material.
3. The positive electrode for an alkaline battery according to claim 1 , further comprising
electrolytic manganese dioxide as a positive electrode active material,
wherein the content of the electrolytic manganese dioxide in the entire positive electrode active material is not more than 70 mass %.
4. The positive electrode for an alkaline battery according to claim 1 ,
wherein the spinel-type manganese oxide has a potential of not less than 0.27 V with respect to a Hg/HgO reference electrode.
5. The positive electrode for an alkaline battery according to claim 1 ,
wherein the spinel-type manganese oxide has a potential of not less than 0.28 V with respect to a Hg/HgO reference electrode.
6. The positive electrode for an alkaline battery according to claim 1 ,
wherein the spinel-type manganese oxide has a potential of not more than 0.32 V with respect to a Hg/HgO reference electrode.
7. The positive electrode for an alkaline battery according to claim 1 ,
wherein the spinel-type manganese oxide further comprises Cu.
8. The positive electrode for an alkaline battery according to claim 1 ,
wherein the spinel-type manganese oxide is obtained by heat-treating, at 180 to 220° C. for 15 to 25 hours, a spinel-type manganese oxide having a potential of more than 0.34 V with respect to a Hg/HgO reference electrode.
9. An alkaline battery comprising: a positive electrode; a negative electrode; and an electrolyte,
wherein the positive electrode comprises a spinel-type manganese oxide having a potential of 0.26 to 0.34 V with respect to a Hg/HgO reference electrode as a positive electrode active material, and
the content of the spinel-type manganese oxide in the entire positive electrode active material of the positive electrode is not less than 60 mass %.
10. The alkaline battery according to claim 9 ,
wherein the positive electrode further comprises electrolytic manganese dioxide as a positive electrode active material.
11. The alkaline battery according to claim 9 ,
wherein the positive electrode further comprises electrolytic manganese dioxide as a positive electrode active material, and
the content of the electrolytic manganese dioxide in the entire positive electrode active material is not more than 70 mass %.
12. The alkaline battery according to claim 9 ,
wherein the spinel-type manganese oxide has a potential of not less than 0.27 V with respect to a Hg/HgO reference electrode.
13. The alkaline battery according to claim 9 ,
wherein the spinel-type manganese oxide has a potential of not less than 0.28 V with respect to a Hg/HgO reference electrode.
14. The alkaline battery according to claim 9 ,
wherein the spinel-type manganese oxide has a potential of not more than 0.32 V with respect to a Hg/HgO reference electrode.
15. The alkaline battery according to claim 9 ,
wherein the spinel-type manganese oxide further comprises Cu.
16. The alkaline battery according to claim 9 ,
wherein the spinel-type manganese oxide is obtained by heat-treating, at 180 to 220° C. for 15 to 25 hours, a spinel-type manganese oxide having a potential of more than 0.34 V with respect to a Hg/HgO reference electrode.
17. The alkaline battery according to claim 9 ,
wherein the negative electrode comprise zinc or a zinc alloy as a negative electrode active material.
18. The alkaline battery according to claim 9 ,
wherein the electrolyte comprises an aqueous solution containing a hydroxide of alkali metal.