Electric double-layer capacitor and electrode therefor
View Patent ↗An electrode for electric double-layer capacitor includes a collector with a protective layer containing phosphorous on its surface, and a polarizable electrode layer that is formed on this collector and can adsorb and desorb ions. An amount of a phosphorous compound per unit surface area of the collector, eluted when the collector is immersed into water, is not greater than 1.35 mg/m 2 in terms of phosphorous equivalent. An electric double-layer capacitor employs this electrode for at least one of a positive electrode and a negative electrode.
1. An electrode for electric double-layer capacitor, comprising:
a collector including a protective layer containing phosphorous on a surface thereof; and
a polarizable electrode layer that is formed above the collector and capable of reversibly adsorbing and desorbing ions;
wherein an amount of a phosphorous compound per unit surface area of the collector, eluted when the collector is immersed into water, is not greater than 1.35 mg/m 2 in terms of phosphorous equivalent.
2. The electrode for electric double-layer capacitor according to claim 1 , further comprising a conductive layer in contact with the collector,
wherein the polarizable electrode layer is in contact with the conductive layer.
3. The electrode for electric double-layer capacitor according to claim 1 ,
wherein the polarizable electrode layer is in contact with the collector.
4. An electric double-layer capacitor comprising:
a capacitor element including a positive electrode, a negative electrode facing the positive electrode, and a separator disposed between the positive electrode and the negative electrode;
an electrolytic solution with which the capacitor element is impregnated; and
an outer housing accommodating the capacitor element and the electrolytic solution therein,
wherein at least one of the positive electrode and the negative electrode includes:
a collector including a protective layer containing phosphorous on a surface thereof; and
a polarizable electrode layer that is formed above the collector and capable of reversibly adsorbing and desorbing ions, and
wherein an amount of a phosphorous compound per unit surface area of the collector, eluted when the collector is immersed into water, is not greater than 1.35 mg/m 2 in terms of phosphorous equivalent.
5. The electric double-layer capacitor according to claim 4 , further comprising a conductive layer in contact with the collector,
wherein the polarizable electrode layer is in contact with the conductive layer.
6. The electric double-layer capacitor according to claim 4 ,
wherein the polarizable electrode layer is in contact with the collector.