ELECTRODE FOR ELECTROCHEMICAL ELEMENT AND ELECTROCHEMICAL ELEMENT USING THE SAME

1 . An electrode for an electrochemical element for inserting and extracting a lithium ion reversibly, comprising:

a current collector forming a concave portion and a convex portion at least on one side; and

a columnar body including an active material formed on the convex portion of the current collector,

wherein the columnar body covers at least a part of respective sides of the convex portion.

2 . The electrode for an electrochemical element of claim 1 ,

wherein the columnar body has the active material grown radially.

3 . The electrode for an electrochemical element of claim 1 ,

wherein the composition of the columnar body is uniform in a range of a micrometer size or larger.

4 . The electrode for an electrochemical element of claim 1 ,

wherein the columnar body has at least two different compositions in a range of a nanometer size.

5 . The electrode for an electrochemical element of claim 1 ,

wherein the active material is at least a material capable of inserting and extracting a lithium ion reversibly, and having a theoretical capacity density of more than 833 mAh/cm 3 .

6 . The electrode for an electrochemical element of claim 5 ,

wherein the material is a material expressed by SiOx at least containing silicon.

7 . The electrode for an electrochemical element of claim 4 ,

wherein the columnar body is composed of different materials at least expressed by Si and SiOy in a range of the nanometer size.

8 . An electrode for an electrochemical element for inserting and extracting a lithium ion reversibly, comprising:

a current collector; and

a columnar body including an active material formed radially on the current collector.

9 . An electrochemical element comprising:

an electrode for an electrochemical element of any one of claims 1 to 8 ;

a counter electrode for inserting and extracting a lithium ion reversibly; and

a nonaqueous electrolyte.