Anode for secondary battery and secondary battery having the same

1. An anode for a secondary battery, comprising:

a wire-type current collector; a metallic anode active material layer formed on the surface of the wire-type current collector and comprising a metallic anode active material; and

an inert metal layer formed on the surface of the metallic anode active material layer and having no reactivity with lithium; and

a conductive layer formed to surround the outer surface of the inert metal layer and comprising a mixture of a first conductive material and a polymer binder.

2. The anode according to claim 1 , wherein the wire-type current collector is made of stainless steel; aluminum; nickel; titanium; sintered carbon; copper; stainless steel treated with carbon, nickel, titanium or silver on the surface thereof; an aluminum-cadmium alloy; a non-conductive polymer treated with a second conductive material on the surface thereof; or a conductive polymer.

3. The anode according to claim 2 , wherein the second conductive material is any one selected from the group consisting of polyacetylene, polyaniline, polypyrrole, polythiophene, polysulfurnitride, indium tin oxide (no), copper, silver, palladium, nickel, and a mixture thereof.

4. The anode according to claim 2 , wherein the conductive polymer is a polymer selected from the group consisting of polyacetylene, polyaniline, polypyrrole, polythiophene, polysulfurnitride, and a mixture thereof.

5. The anode according to claim 1 , wherein the metallic anode active material is an active material selected from the group consisting of a metal (Me) of Si, Sn, Li, Zn, Mg, Cd, Ce, Ni or Fe; an alloy of the metal; an oxide (MeOx) of the metal; a complex of the metal and carbon; and a mixture thereof.

6. The anode according to claim 1 , wherein the inert metal is an active material selected from the group consisting of nickel, copper, iron, vanadium (V), manganese, cobalt, and a mixture thereof.

7. The anode according to claim 1 , wherein the inert metal layer is formed by way of plating.

8. The anode according to claim 1 , wherein the first conductive material is any one selected from the group consisting of carbon black, acetylene black, Ketjen black, Denka black, carbon fiber, and a mixture thereof.

9. The anode according to claim 1 , wherein the polymer binder is any one selected from the group consisting of polyvinylidene fluoride-co-hexafluoro propylene, polyvinylidene fluoride-co-trichloro ethylene, polymethyl methacrylate, polybutylacrylate, polyacrylonitrile, polyvinylpyrrolidone, polyvinylacetate, polyvinylalcohol, polyethylene-co-vinyl acetate, polyethylene oxide, polyarylate, cellulose acetate, cellulose acetate butyrate, cellulose acetate propionate, cyanoethyl pullulan, cyanoethyl polyvinylalcohol, cyanoethyl cellulose, cyanoethyl sucrose, pullulan, styrene-butadiene rubber, carboxyl methyl cellulose, and a mixture thereof.

10. An anode for a secondary battery, comprising:

a spiral anode consisting of at least two wire-type anodes being spirally twisted with each other, each of the wire-type anodes comprising a wire-type current collector, and a metallic anode active material layer formed on the surface of the wire-type current collector and comprising a metallic anode active material; and

an inert metal layer formed on the surface of the spiral anode and having no reactivity with lithium.

11. The anode according to claim 10 , wherein the spiral electrode has a twist rate of 0.01 to 10 mm per one twist.

12. The anode according to claim 10 , which further comprises a conductive layer formed to surround the outer surface of the inert metal layer and comprising a mixture of a first conductive material and a polymer binder.