ALKALINE DRY BATTERY

1 . An alkaline dry battery, comprising:

a positive electrode;

a negative electrode;

a separator between the positive electrode and the negative electrode; and

an alkaline electrolyte with which the positive electrode, the negative electrode, and the separator are impregnated,

wherein at least the alkaline electrolyte contains a battery depolarizer which is an organic compound that depolarizes both the positive electrode and the negative electrode or an alkaline metal salt of the organic compound.

2 . The alkaline dry battery of claim 1 ,

wherein the battery depolarizer is one selected from the group consisting of: phosphoric acid ester of phosphoric acid and aliphatic alcohol; an alkaline metal salt of the phosphoric acid ester; hydrocarbonated phosphoric acid; and an alkaline metal salt of the hydrocarbonated phosphoric acid.

3 . The alkaline dry battery of claim 1 ,

wherein the battery depolarizer is at least one of compounds expressed by Chemical formulae 1 to 3:

where R 1 is a hydrocarbon group of which carbon number is in a range between 1 and 4, both inclusive, R 2 is —CH 2 CH 2 — or —CH(CH 3 )CH 2 —, and n is in a range between 1 and 8, both inclusive;

where R 3 and R 4 each are a hydrogen atom or a hydrocarbon group of which carbon number is in a range between 1 and 6, both inclusive, and a sum of the carbon number of R 3 and the carbon number of R 4 is in a range between 1 and 6, both inclusive; and

where R 5 is a hydrocarbon group of which carbon number is in a range between 1 and 6, both inclusive.

4 . The alkaline dry battery of claim 3 ,

wherein in Chemical formula 1, R 1 is C m H 2m+1 — where m is in a range between 1 and 4, both inclusive.

5 . The alkaline dry battery of claim 3 ,

wherein in Chemical formula 2, R 3 is C m H 2m+1 —, and R 4 is C n H 2n+1 — where m and n are in a range between 0 and 6, both inclusive, and (m+n) is in a range between 1 and 6, both inclusive.

6 . The alkaline dry battery of claim 3 ,

wherein in Chemical formula 3, R 5 is C n H 2n+1 — where n is in a range between 1 and 6, both inclusive,

7 . An LR6 alkaline dry battery, comprising:

a positive electrode;

a negative electrode;

a separator between the positive electrode and the negative electrode; and

an alkaline electrolyte with which the positive electrode, the negative electrode, and the separator are impregnated; and

a battery depolarizer in at least the alkaline electrolyte,

wherein in repetition of a discharge cycle where a current of 250 mA is discharged for one hour a day, 0<(V i1 −V f1 )≦0.35 is satisfied when a closed circuit voltage is lower than 0.9 V in an m-th cycle, where V i1 (volt) is a closed circuit voltage at discharge start in an (m−1)-th cycle discharge, and V f1 (volt) is a closed circuit voltage at discharge end in the (m−1)-th cycle.

8 . An LR6 alkaline dry battery, comprising:

a positive electrode;

a negative electrode;

a separator between the positive electrode and the negative electrode; and

an alkaline electrolyte with which the positive electrode, the negative electrode, and the separator are impregnated; and

a battery depolarizer in at least the alkaline electrolyte,

wherein the positive electrode contains, as a positive electrode active material, manganese dioxide of which theoretical capacity is 308 mAh/g, and

in repetition of a discharge cycle where a current of 250 mA is discharged for one hour a day,

0.76≦(250T/308C)≦0.86 is satisfied where T (hour) is a duration from start of the discharge cycle to time when a closed circuit voltage becomes lower than 0.9 V, and C (g) is a weight of the manganese dioxide in the positive electrode.

9 . An LR03 alkaline dry battery, comprising:

a positive electrode;

a negative electrode;

a separator between the positive electrode and the negative electrode; and

an alkaline electrolyte with which the positive electrode, the negative electrode, and the separator are impregnated; and

a battery depolarizer in at least the alkaline electrolyte,

wherein in repetition of a discharge cycle where a current of 100 mA is discharged for one hour a day, 0<(V i2 −V f2 )≦0.35 is satisfied when a closed circuit voltage is lower than 0.9 V in an n-th cycle, where V i2 (volt) is a closed circuit voltage at discharge start in an (n−1)-th discharge cycle, and V f2 (volt) is a closed circuit voltage at discharge end in the (n−1)-th cycle.

10 . An LR03 alkaline dry battery, comprising:

a positive electrode;

a negative electrode;

a separator between the positive electrode and the negative electrode; and

an alkaline electrolyte with which the positive electrode, the negative electrode, and the separator are impregnated; and

a battery depolarizer in at least the alkaline electrolyte,

wherein the positive electrode contains, as a positive electrode active material, manganese dioxide of which theoretical capacity is 308 mAh/g, and

in repetition of a discharge cycle where a current of 100 mA is discharged for one hour a day, 0.84≦(100T/308C)≦0.92 is satisfied where T (hour) is a duration from start of the discharge cycle to time when a closed circuit voltage becomes lower than 0.9 V, and C (g) is a weight of the manganese dioxide in the positive electrode.

11 . The alkaline dry battery of claim 7 ,

wherein the battery depolarizer depolarizes both the positive electrode and the negative electrode and is at least one selected from the group consisting of: phosphoric acid ester of phosphoric acid and aliphatic alcohol; an alkaline metal salt of the phosphoric acid ester; hydrocarbonated phosphoric acid; and an alkaline metal salt of the hydrocarbonated phosphoric acid.