Storage battery
A storage battery includes a negative electrode including, as an active material, at least one of a metal capable of forming a dendrite and a metal compound thereof, a positive electrode, a separator, and an electrolyte containing an additive. In the storage battery, a concentration of the additive in the electrolyte in a region on a side of the negative electrode defined by the separator is higher than a concentration of the additive in a region on a side of the positive electrode.
1. A storage battery comprising:
a negative electrode including, as an active material, at least one of a metal capable of forming a dendrite and a metal compound thereof;
a positive electrode;
a separator; and
an electrolyte containing an additive,
wherein the additive can move in the electrolyte through diffusion or migration,
a concentration of the additive in the electrolyte in a region on a side of the negative electrode defined by the separator is higher than a concentration of the additive in a region on a side of the positive electrode, and
the electrolyte is an alkaline electrolyte solution.
2. The storage battery according to claim 1 , wherein the separator is a semipermeable membrane.
3. The storage battery according to claim 1 , wherein the separator is an ion-exchange membrane.
4. The storage battery according to claim 1 , wherein the additive is a substance capable of enhancing charge-discharge characteristics of the negative electrode.
5. The storage battery according to claim 1 , wherein the additive is a substance capable of reducing the solubility of at least one of the metal capable of forming a dendrite and the metal compound thereof in the electrolyte.
6. The storage battery according to claim 1 , wherein the additive is an organic substance.
7. The storage battery according to claim 1 , wherein a viscosity of the electrolyte in the region on the negative electrode side is 70 Pa·s or less.
8. The storage battery according to claim 1 , wherein the maximum operating potential of the positive electrode is 0.4 V or more relative to a potential of an electrode of Hg/HgO.
9. The storage battery according to claim 1 , wherein the separator is an anion-exchange membrane.
10. The storage battery according to claim 1 , wherein the separator is an ion-exchange membrane, and the ion-exchange membrane contains polyolefin as a substrate.
11. A storage battery comprising:
a negative electrode including, as an active material, at least one of a metal capable of forming a dendrite and a metal compound thereof;
a positive electrode;
a separator; and
an electrolyte containing an additive,
wherein the additive can move in the electrolyte through diffusion or migration,
a concentration of the additive in the electrolyte in a region on a side of the negative electrode defined by the separator is higher than a concentration of the additive in a region on a side of the positive electrode, and
the separator is a grafted membrane.